@misc{BrandlPalmMichailovetal., author = {Brandl, Erhard and Palm, Frank and Michailov, Vesselin and Viehweger, Bernd and Leyens, Christoph}, title = {Mechanical properties of additive manufactured titanium (Ti-6Al-4V) blocks deposited by a solid-state laser and wire}, series = {Materials and Design}, volume = {32}, journal = {Materials and Design}, number = {10}, issn = {0261-3069}, pages = {4665 -- 4675}, language = {en} } @misc{BrandlViehwegerMichailovetal., author = {Brandl, Erhard and Viehweger, Bernd and Michailov, Vesselin and Leyens, Christoph}, title = {Deposition of Ti-6Al-4V using laser and wire, part I: Microstructural properties of single beads}, language = {en} } @misc{MalikovOssenbrinkViehwegeretal., author = {Malikov, Viatcheslav and Ossenbrink, Ralf and Viehweger, Bernd and Michailov, Vesselin}, title = {Experimental investigation and analytical calculation of the bending force for air bending of structured sheet metals}, series = {Advanced Materials Research}, volume = {418-420}, journal = {Advanced Materials Research}, issn = {1022-6680}, pages = {1294 -- 1300}, language = {en} } @misc{KornienkoOssenbrinkMichailov, author = {Kornienko, Elena and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Corrosion properties of structured sheet metals in salt environment}, series = {Engineering Review}, volume = {31}, journal = {Engineering Review}, number = {2}, issn = {1330-9587}, pages = {97 -- 104}, language = {en} } @misc{BandlMichailovViehwegeretal., author = {Bandl, Erhard and Michailov, Vesselin and Viehweger, Bernd and Leyens, Christoph}, title = {Deposition of Ti-6Al-4V using laser and wire, part II: Hardness and dimensions of single beads}, series = {Surface \& Coatings Technology}, volume = {206}, journal = {Surface \& Coatings Technology}, number = {6}, issn = {0257-8972}, pages = {1130 -- 1141}, language = {en} } @misc{DreibatiOssenbrinkDoynovetal., author = {Dreibati, Ossama and Ossenbrink, Ralf and Doynov, Nikolay and Michailov, Vesselin}, title = {Physical and numerical simulation of thermo-mechanical properties in the weld heat affected zone of an AlMgSi-alloy}, series = {Materials Science Forum}, volume = {706-709}, journal = {Materials Science Forum}, issn = {0255-5476}, pages = {1491 -- 1496}, language = {en} } @inproceedings{MalikovOssenbrinkViehwegeretal., author = {Malikov, Viatcheslav and Ossenbrink, Ralf and Viehweger, Bernd and Michailov, Vesselin}, title = {FE-Simulation of deep drawing of structured sheet metals}, series = {New technologies and achievements in metallurgy and materials engineering, XIII International Scientific conference, a collective monograph}, booktitle = {New technologies and achievements in metallurgy and materials engineering, XIII International Scientific conference, a collective monograph}, isbn = {978-83-87745-74-5}, pages = {410 -- 413}, language = {en} } @misc{MalikovOssenbrinkViehwegeretal., author = {Malikov, Viatcheslav and Ossenbrink, Ralf and Viehweger, Bernd and Michailov, Vesselin}, title = {Analytical and numerical calculation of the force and power requirements for air bending of structured sheet metals}, series = {Key Engineering Materials}, volume = {Vol. 473}, journal = {Key Engineering Materials}, issn = {1013-9826}, doi = {10.4028/www.scientific.net/KEM.473.602}, pages = {602 -- 609}, language = {en} } @misc{MalikovOssenbrinkViehwegeretal., author = {Malikov, Viatcheslav and Ossenbrink, Ralf and Viehweger, Bernd and Michailov, Vesselin}, title = {Investigation of air bending of structured sheet metals by multistage FE simulation}, series = {The International Journal of Advanced Manufacturing Technology}, volume = {63}, journal = {The International Journal of Advanced Manufacturing Technology}, number = {5-8}, issn = {1433-3015}, doi = {10.1007/s00170-012-3927-4}, pages = {449 -- 455}, language = {en} } @book{MichailovDoynovOssenbrink, author = {Michailov, Vesselin and Doynov, Nikolay and Ossenbrink, Ralf}, title = {Sensibilit{\"a}tsanalyse der thermomechanischen FE-Schweißsimulation}, publisher = {Shaker}, address = {Aachen}, isbn = {978-3-8440-1016-9}, pages = {137}, language = {de} } @misc{GenchevDreibatiOssenbrinketal., author = {Genchev, Gancho Vladimirov and Dreibati, Ossama and Ossenbrink, Ralf and Doynov, Nikolay and Michailov, Vesselin}, title = {Physical and Numerical Simulation of the Heat-affected Zone of Multi-pass Welds}, series = {Materials Science Forum}, journal = {Materials Science Forum}, number = {Vol. 762}, issn = {0255-5476}, pages = {544 -- 550}, abstract = {The paper presents a numerical and experimental approach for the quantification of the thermo-mechanical properties in multi-pass weld's heat affected zone (HAZ) of low alloy steel "S355J2+N". First, the characteristic temperature cycles for multi-pass welds were identified by FE temperature field simulations of welding. Based on the identified temperature cycles, the microstructure in the HAZ has been physically simulated with the simulation and testing system Gleeble 3500 to investigate the influence of multi thermal exposure on the thermo-mechanical properties. Thus, the thermo-mechanical material properties including thermal strain and temperature dependent stress strain behaviour as function of peak temperatures and cooling rates have been determined. These material properties were used to calibrate a developed model for numerical prediction of the material properties of multi-pass weld HAZ.}, language = {en} } @incollection{GenchevOssenbrinkDoynovetal., author = {Genchev, Gancho Vladimirov and Ossenbrink, Ralf and Doynov, Nikolay and Michailov, Vesselin}, title = {Gef{\"u}geeigenschaften in der W{\"a}rmeeinflusszone von Mehrlagenschweißungen aus S355J2+N}, series = {Fortschritte in der Metallographie}, booktitle = {Fortschritte in der Metallographie}, editor = {Keßler, Olaf}, publisher = {Inventum}, address = {Bonn}, isbn = {978-3-88355-392-4}, pages = {167 -- 172}, language = {de} } @inproceedings{GenchevDoynovOssenbrinketal., author = {Genchev, Gancho Vladimirov and Doynov, Nikolay and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Simulation des Mehrlagenschweißens unter Ber{\"u}cksichtigung der Gef{\"u}geumwandlungen}, series = {Conference proceedings, 2012 - ANSYS Conference \& 30. CADFEM Users' Meeting, 24. - 26. Oktober 2012, Kassel}, booktitle = {Conference proceedings, 2012 - ANSYS Conference \& 30. CADFEM Users' Meeting, 24. - 26. Oktober 2012, Kassel}, publisher = {CADFEM GmbH}, address = {Grafing}, pages = {Art. 2.2.9}, abstract = {Der Konferenzvortrag stellt das entwickelte M-STAAZ Modell vor. Mit dem M-STAAZ l{\"a}sst sich in der FE-Simulation die {\"A}nderung der Werkstoffkennwerte bei mehrmaliger Temperaturbelastung wie in der WEZ von Mehrlagenschweißungen ber{\"u}cksichtigen.}, language = {de} } @inproceedings{GenchevDoynovOssenbrinketal., author = {Genchev, Gancho Vladimirov and Doynov, Nikolay and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Bewertung der relevanten Einflussfaktoren auf die Gef{\"u}geumwandlungen und thermomechanischen Eigenschaften bei komplexen Temperaturbelastungen}, series = {ANSYS Conference \& 29. CADFEM Users' Meeting 2011, conference proceedings, 19. - 21. October 2011, Stuttgart, ICS}, booktitle = {ANSYS Conference \& 29. CADFEM Users' Meeting 2011, conference proceedings, 19. - 21. October 2011, Stuttgart, ICS}, publisher = {CADFEM GmbH}, address = {Grafing}, isbn = {3-937523-08-1}, abstract = {Der Vortrag stellt die Identifizierung und Bewertung der relevanten Einflussfaktoren auf die Gef{\"u}geumwandlungen und auf die thermomechanischen Werkstoffkennwerte bei komplexen Temperaturbelastungen vor. Dies erfolgt durch physikalische Simulation der Gef{\"u}ge in der WEZ von Mehrlagenschweißungen und Aufnahme von Dilatometerkurven und Spannungs-Dehnungskurven. Es wurden einflussarme Kombination von Temperaturzyklen und weitere mit starkem Einfluss auf die Gef{\"u}geumwandlung identifiziert. Hinweise zu den erforderlichen Werkstoffkennwerten f{\"u}r die numerische Schweißsimulation wurden gegeben.}, language = {de} } @book{MichailovKarkhinPetrov, author = {Michailov, Vesselin and Karkhin, Victor A. and Petrov, Peter}, title = {Grundlagen der Schweißtechnik}, publisher = {Bauwesen}, address = {Sofia}, isbn = {978-954-90912-6-7}, pages = {197}, language = {mul} } @inproceedings{SasseOssenbrinkMichailov, author = {Sasse, Ina and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Welding of structured sheet metals with high power fiber laser}, series = {Międzynarodowa Sesja Studencka, 30. Mai 2012, Częstochowa/Polen}, booktitle = {Międzynarodowa Sesja Studencka, 30. Mai 2012, Częstochowa/Polen}, address = {Częstochowa}, isbn = {978-83-87745-69-1}, pages = {285 -- 290}, language = {en} } @inproceedings{GenchevOssenbrinkDoynovetal., author = {Genchev, Gancho Vladimirov and Ossenbrink, Ralf and Doynov, Nikolay and Michailov, Vesselin}, title = {Material Properties of the HAZ of Multi-Pass Welded Joints from low alloyed Steel}, series = {Junior Euromat 2012, Paperlist}, booktitle = {Junior Euromat 2012, Paperlist}, pages = {A297}, language = {en} } @incollection{OssenbrinkBrandMichailov, author = {Ossenbrink, Ralf and Brand, M. and Michailov, Vesselin}, title = {Numerische Simulation der Eigenspannungen und des Bauteilverzugs beim Schweißen mit Ber{\"u}cksichtigung des Umwandlungsverhaltens}, series = {Große Schweißtechnische Tagung, Schweissen und Schneiden, 2003}, booktitle = {Große Schweißtechnische Tagung, Schweissen und Schneiden, 2003}, publisher = {DVS-Verlag}, address = {D{\"u}sseldorf}, isbn = {3-87155-683-1}, pages = {279 -- 283}, language = {de} } @inproceedings{BrandPetzTutschetal., author = {Brand, M. and Petz, M. and Tutsch, R. and Wohlfahrt, Helmut and Michailov, Vesselin}, title = {Numerische Simulation und Verifikation des Bauteilverzugs beim Schweißen unter Verwendung optischer Feldmeßmethoden}, series = {Conference proceedings, 21st CAD-FEM Users' Meeting 2003, International Congress on FEM Technology, 12. - 14. November 2003, im Hotel Dorint Sanssouci Berlin, Potsdam}, booktitle = {Conference proceedings, 21st CAD-FEM Users' Meeting 2003, International Congress on FEM Technology, 12. - 14. November 2003, im Hotel Dorint Sanssouci Berlin, Potsdam}, publisher = {CAD-FEM GmbH}, address = {Grafing bei M{\"u}nchen}, isbn = {3-937523-00-6}, language = {de} } @misc{MichailovStadtaus, author = {Michailov, Vesselin and Stadtaus, Marc}, title = {Einige Probleme der FE-Simulation zur Wasserstoff- und Stickstoffverteilung beim Schweißen}, series = {Zeitschrift f{\"u}r Metallkunde}, volume = {92}, journal = {Zeitschrift f{\"u}r Metallkunde}, number = {3}, issn = {0044-3093}, pages = {247 -- 252}, language = {de} } @misc{ZhangDoynovWolfetal., author = {Zhang, Wei and Doynov, Nikolay and Wolf, Matthias and Dreibati, Ossama and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Investigation of the Thermal Shock Behavior of Ceramic Using a Combination of Experimental Testing and FE-Simulation Methods}, series = {Advanced engineering materials}, volume = {15}, journal = {Advanced engineering materials}, number = {6}, issn = {1527-2648}, doi = {10.1002/adem.201200241}, pages = {480 -- 484}, abstract = {Thermal shock behavior of ceramics plays a decisive role in their broad industrial applications. For enhanced understanding of damage and failure mechanism under thermal shock loading, in the present work, a combination of experimental testing and numerical simulation methods has been used. The thermal shock behavior of the alumina (99.7\%) disk samples has been investigated by using a plasma test stand: the bottom of the ceramic disks were locally heated in the center by plasma beam; during the heat treatment the temperature distribution at the top of the sample was recorded with a thermographic system. To characterize the thermal shock resistance, a thermomechanical simulation was subsequently carried out. It calculates the temperature and stress distribution within the ceramic disks. The calculated critical thermal tension stresses are reported, which led to the failure of the ceramic disks under thermal shock loading. The effect of the sample thickness on the temperature and stress distribution is presented. Compared with the experimental results the simulated results show excellent agreement. As conclusion, it is possible to determine the thermal shock behavior of ceramic materials by the combination of experimental testing and numerical simulation.}, language = {en} } @inproceedings{OssenbrinkMichailov, author = {Ossenbrink, Ralf and Michailov, Vesselin}, title = {Vorhersage der H{\"a}rteverteilung beim Schweißen mit Hilfe der numerischen Simulation}, series = {Conference proceedings, 21st CAD-FEM Users' Meeting 2003, International Congress on FEM Technology, 12. - 14. November 2003, im Hotel Dorint Sanssouci Berlin, Potsdam}, booktitle = {Conference proceedings, 21st CAD-FEM Users' Meeting 2003, International Congress on FEM Technology, 12. - 14. November 2003, im Hotel Dorint Sanssouci Berlin, Potsdam}, publisher = {CAD-FEM GmbH}, address = {Grafing bei M{\"u}nchen}, isbn = {3-937523-00-6}, language = {de} } @incollection{DoynovChristovMichailovetal., author = {Doynov, Nikolay and Christov, St. and Michailov, Vesselin and Wohlfahrt, Helmut}, title = {Finite Elements Simulation of Multipass Submerged Arc Welding}, series = {Mathematical Modelling of Weld Phenomena 6}, booktitle = {Mathematical Modelling of Weld Phenomena 6}, publisher = {Maney - IOM}, address = {London}, isbn = {978-1-902653-56-3}, pages = {651 -- 669}, language = {en} } @incollection{StadtausMichailovWohlfahrt, author = {Stadtaus, Marc and Michailov, Vesselin and Wohlfahrt, Helmut}, title = {Simulation of Weld Shape, Microstructure, Distortion and Residual Stresses for Laser Beam Welding}, series = {Mathematical Modelling of Weld Phenomena 6}, booktitle = {Mathematical Modelling of Weld Phenomena 6}, publisher = {Maney - IOM}, address = {London}, isbn = {978-1-902653-56-3}, pages = {419 -- 442}, language = {en} } @incollection{RethmeierStadtausMichailovetal., author = {Rethmeier, M. and Stadtaus, Marc and Michailov, Vesselin and Wohlfahrt, Helmut}, title = {Numerical Calculation of Temperature Load and Distortion during Welding of Circumferential Weld Seams}, series = {Mathematical Modelling of Weld Phenomena 6}, booktitle = {Mathematical Modelling of Weld Phenomena 6}, publisher = {Maney - IOM}, address = {London}, isbn = {978-1-902653-56-3}, pages = {685 -- 702}, language = {en} } @incollection{StadtausMichailovWohlfahrt, author = {Stadtaus, Marc and Michailov, Vesselin and Wohlfahrt, Helmut}, title = {Berechnung von Nahtgeometrie, Gef{\"u}ge, Verzug und Eigenspannungen beim Schmelzschweißen}, series = {Schweißen und Schneiden 2001}, booktitle = {Schweißen und Schneiden 2001}, publisher = {DVS Verlag}, address = {D{\"u}sseldorf}, isbn = {978-3-87155-674-6}, pages = {315 -- 321}, language = {de} } @incollection{RoehrsMichailovWohlfahrt, author = {R{\"o}hrs, K. and Michailov, Vesselin and Wohlfahrt, Helmut}, title = {Einfluss von Beimengungen zum Schutzgas beim Lichtbogenschweißen von Aluminiumwerkstoffen}, series = {Schweißen und Schneiden 2001}, booktitle = {Schweißen und Schneiden 2001}, publisher = {DVS Verlag}, address = {D{\"u}sseldorf}, isbn = {978-3-87155-674-6}, pages = {349 -- 354}, language = {de} } @inproceedings{KarkhinLevchenkoHomichetal., author = {Karkhin, Victor A. and Levchenko, A. M. and Homich, P. N. and Michailov, Vesselin}, title = {Computer-Aided Express Determination of Diffusible Hydrogen in Deposited Weld Metal}, series = {International Conference on Total Welding Management in Industrial Applications, 3rd JOIN Conference, Lappeenranta, August 21 - 24, 2007}, booktitle = {International Conference on Total Welding Management in Industrial Applications, 3rd JOIN Conference, Lappeenranta, August 21 - 24, 2007}, address = {Lappeenranta}, isbn = {978-952-214-413-3}, pages = {252 -- 262}, language = {en} } @misc{StadtausMichailovWohlfahrt, author = {Stadtaus, Marc and Michailov, Vesselin and Wohlfahrt, Helmut}, title = {Numerical calculation of the main factors on cold cracking}, series = {Materialwissenschaften und Werkstofftechnik}, volume = {34}, journal = {Materialwissenschaften und Werkstofftechnik}, number = {1}, issn = {0933-5137}, doi = {10.1002/mawe.200390007}, pages = {145 -- 151}, language = {en} } @inproceedings{OssenbrinkMichailovWohlfahrt, author = {Ossenbrink, Ralf and Michailov, Vesselin and Wohlfahrt, Helmut}, title = {Numerische Simulation der Eigenspannungen und des Bauteilverzugs beim Schweißen unter Ber{\"u}cksichtigung der zeitlichen und {\"o}rtlichen {\"A}nderung der Dehnrate}, series = {Internationale FEM-Technologietage, 20th CAD-FEM Users' Meeting, 9-11 Oktober 2002, Friedrichshafen}, booktitle = {Internationale FEM-Technologietage, 20th CAD-FEM Users' Meeting, 9-11 Oktober 2002, Friedrichshafen}, publisher = {CAD-FEM GmbH}, address = {Grafing bei M{\"u}nchen}, language = {de} } @misc{KornienkoOssenbrinkMichailov, author = {Kornienko, Elena and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Corrosion resistance of zinc-coated structured sheet metals}, series = {Corrosion Science}, volume = {Vol. 69}, journal = {Corrosion Science}, issn = {0010-938X}, pages = {270 -- 280}, abstract = {The purpose of this study is to characterise the corrosion behaviour of zinc-coated sheet metals after a structuring process using the salt spray test. The investigated structured material is manufactured by hydroforming and has a periodic hexagonal geometry. The corrosion behaviour has been evaluated by estimating the development of the corrosion area and penetration depth. The results of the investigation show that the corrosion area is larger on the smooth sheet than on the structured sheet. The difference between the structured and smooth sheets is negligible with increasing exposure time. Furthermore, the reasons for the different corrosion behaviours are discussed.}, language = {en} } @inproceedings{OssenbrinkDoynovMichailov, author = {Ossenbrink, Ralf and Doynov, Nikolay and Michailov, Vesselin}, title = {Welding simulation of aluminium to steel joints by means of arc welding Processes}, series = {10th International Scientific and Technical Conference, Advanced metal materials and technologies (AMMT'2013), June 25-29, Saint Petersburg, 2013}, booktitle = {10th International Scientific and Technical Conference, Advanced metal materials and technologies (AMMT'2013), June 25-29, Saint Petersburg, 2013}, publisher = {Izdat. Polytechn. Univ.}, address = {Saint Petersburg, Russia}, pages = {523 -- 528}, abstract = {The object of the present work is the introduction of a welding simulation approach for aluminium to steel welded joints which are realised by short-arc welding. The study is carried out with special emphasis on the simulation of temperature field by means of conduction solution, on the applicability of different metallurgical models as well as the aspects of the mechanical simulation of the residual welding stresses and distortions. As result an approved heat source model is suggested and the calibration parameters are presented. For the modelling of the microstructure and corresponding thermomechanical material properties in the heat affected zone different material models are validated. They are used to simulate the welding residual stresses and distortions. Furthermore, the welding simulation of a real component as well as a simulation study of different welding scenarios is presented.}, language = {en} } @misc{VossMichailovDecker, author = {Voß, O. and Michailov, Vesselin and Decker, I.}, title = {Erweiterung der numerischen Schweißsimulation zur Untersuchung metallkundlicher Fragestellungen}, series = {Zeitschrift f{\"u}r Metallkunde}, volume = {92}, journal = {Zeitschrift f{\"u}r Metallkunde}, number = {3}, issn = {0044-3093}, pages = {293 -- 299}, language = {de} } @misc{ThomasMichailovWohlfahrt, author = {Thomas, Karl and Michailov, Vesselin and Wohlfahrt, Helmut}, title = {Z{\"a}higkeitsuntersuchungen an schmalen Verfahrenseinflusszonen pressstumpfgeschweißter St{\"a}hle}, series = {Schweißen und Schneiden}, volume = {52}, journal = {Schweißen und Schneiden}, number = {12}, pages = {734 -- 745}, language = {de} } @misc{SasseSchleussOssenbrinketal., author = {Sasse, Ina and Schleuß, Leander and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Joining of structured sheet metals - Remote laser beam welding in comparison with resistance spot welding}, series = {Welding and Cutting}, volume = {13}, journal = {Welding and Cutting}, number = {1}, pages = {43 -- 47}, abstract = {One main problem of thin-walled, large-area sheet components for lightweight construction solutions is the inadequate stiffness. One approach for a solution is provided by structured sheet metals which have an increased flexural stiffness due to three-dimensionally incorporated structures. The areas of application of the structured sheet metals (e.g. in subassemblies in automobile, rail vehicle and tank construction) necessitate adapted welding technologies. Since few systematic investigations have been conducted on structured sheet metals in the field of joining technology until now, there is a lack of knowledge about the further processing of these sheets by means of welding technology. The aims of the presented investigations are to make it possible to utilise these modern semi-finished products industrially using remote laser beam welding and to compare this with resistance spot welding. Both are important joining processes in the areas of applications interesting for structured sheet metals and thus constitute key technologies for industrial utilisation. Resistance spot welding has already been qualified for utilisation on structured sheet metals [1]. In addition, investigations were conducted into the remote laser beam welding of structured and flat sheets. These investigations encompass the possibilities of joining structured and flat joining members by means of remote laser beam welding as well as the assessment of the joint strength in tensile shear and peel tests. Thereafter, the results of the investigations are compared with the resistance spot welding of structured sheet metals and specific application recommendations are derived.}, language = {en} } @inproceedings{SasseSchleussOssenbrinketal., author = {Sasse, Ina and Schleuß, Leander and Ossenbrink, Ralf and Michailov, Vesselin}, title = {F{\"u}gen strukturierter Bleche - Remote-Laserstrahlschweißen im Vergleich zum Widerstandspunktschweißen}, series = {DVS Congress 2013, Große Schweißtechnische Tagung, DVS-Studentenkongress}, booktitle = {DVS Congress 2013, Große Schweißtechnische Tagung, DVS-Studentenkongress}, publisher = {DVS-Verlag}, address = {D{\"u}sseldorf}, isbn = {978-3-87155-614-2}, pages = {98 -- 103}, language = {de} } @misc{DreibatiOssenbrinkMichailov, author = {Dreibati, Ossama and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Quantification of cold cracking parameters of high strength steels by physical simulation under welding conditions}, series = {Quarterly journal of the Japan Welding Society}, volume = {31}, journal = {Quarterly journal of the Japan Welding Society}, number = {4}, issn = {0288-4771}, doi = {10.2207/qjjws.31.148s}, pages = {148 -- 152}, abstract = {Cold cracks in welds are the result of the formation of brittle microstructure as martensite in the presence of diffusible hydrogen as well as of tensile stresses. Cold cracks occur when the combination of cold crack influence parameters (CCIP) overcomes a critical limit. In this study, critical combinations of CCIP were identified with an enhanced test procedure under welding conditions. The test is based on the physical simulation technique of heat affected zone (HAZ) and it is carried out using the test and simulation center Gleeble 3500. Thereby, laboratory special specimens are charged with hydrogen from pure hydrogen atmosphere in the initial stage of the test. Rigidly restraint specimen section is subjected to different weld temperature cycles. Through the thermal exposure, the desired microstructure of HAZ is set in the test zone of the restraint specimen section. A plastic deformation takes place owing to the prevented expansion during heating and contraction of the specimen during cooling. Consequently, compressive or tensile reactions stresses arise in the deformed zone. Cracked specimen represents a critical combination of the CCIP. The quantitative cold crack criterion separates the cold crack susceptible combinations from those non susceptible.}, language = {en} } @misc{MichailovDreibatiOssenbrinketal., author = {Michailov, Vesselin and Dreibati, Ossama and Ossenbrink, Ralf and Schweizer, Frank}, title = {Rechnergest{\"u}tzte Vorhersage der Kaltrissneigung laserstrahlgeschweißter Bauteile aus hochfesten St{\"a}hlen - Teil 1}, series = {Schweißen und Schneiden : Fachzeitschrift f{\"u}r Schweißen und verwandte Verfahren}, volume = {65}, journal = {Schweißen und Schneiden : Fachzeitschrift f{\"u}r Schweißen und verwandte Verfahren}, number = {11}, issn = {0036-7184}, pages = {776 -- 781}, language = {de} } @inproceedings{SchleussSeidlitzFritzscheetal., author = {Schleuß, Leander and Seidlitz, Holger and Fritzsche, Sebastian and Schulze, Marcus and Michailov, Vesselin and Schuhmann, Tilo}, title = {Gewichtsreduzierte Multi-Material-Bauweisen mit Organoblechen}, series = {Tagungsband, 15. Chemnitzer Textiltechnik-Tagung, Chemnitz, Germany, 31.05-01.06.2016}, booktitle = {Tagungsband, 15. Chemnitzer Textiltechnik-Tagung, Chemnitz, Germany, 31.05-01.06.2016}, publisher = {Technische Universit{\"a}t Chemnitz, Professur F{\"o}rdertechnik}, address = {Chemnitz}, isbn = {978-3-945479-06-3}, pages = {112 -- 119}, language = {de} } @techreport{SchleussBrobeckOssenbrinketal., author = {Schleuß, Leander and Brobeck, Andreas F. W. and Ossenbrink, Ralf and Polzin, Ralf and Michailov, Vesselin}, title = {Rollennahtschweißen strukturierter Feinbleche}, publisher = {BTU, Lehrstuhl F{\"u}ge- und Schweißtechnik}, address = {Cottbus-Senftenberg}, pages = {XV, 154}, abstract = {Strukturierte Bleche besitzen eine dreidimensionale Struktur aus regelm{\"a}ßig angeordneten Versteifungselementen, welche die Steifigkeit der Bleche global erh{\"o}hen. Neben der Steifigkeitserh{\"o}hung besitzen strukturierte Bleche eine vergr{\"o}ßerte Oberfl{\"a}che, ein ver{\"a}ndertes akustisches Verhalten sowie ein ansprechendes Design als positive Merkmale. Mit der Qualifizierung des Rollennahtschweißens f{\"u}r verzugsarme, mediendichte Schweißn{\"a}hte erschließen sich neue wichtige industrielle Anwendungen f{\"u}r strukturierte Bleche und den daraus hergestellten mehrschaligen Bauelementen (zwei strukturierte Bleche im Parallelstoß) mit Hohlr{\"a}umen zwischen den Blechen. Innovative Produktentwicklungen in der W{\"a}rmetechnik, im Transportwesen und im Bauwesen k{\"o}nnen mit strukturierten Blechen f{\"u}r Rekuperatoren, L{\"u}ftungsanlagen, W{\"a}rmeboxen, chemische Apparate, temperierbare Beh{\"a}lter sowie Fußbodenheizungen, K{\"u}hlr{\"a}ume, Klimakammern, Fassadenelemente oder L{\"a}rmschutzw{\"a}nde umgesetzt werden. Derzeit steht dazu kein geeignetes F{\"u}geverfahren zur Verf{\"u}gung, welches alle Anforderungen erf{\"u}llt. Das Rollennahtschweißen eignet sich, strukturierte Bleche so zu f{\"u}gen, dass sie den Anforderungen der zuk{\"u}nftigen Einsatzbereiche entsprechen unter Erhalt der positiven Eigenschaften. In diesem Projekt wurden strukturierte Einzelbleche und der aus ihnen gefertigten mehrschaligen Bauelemente mit dem Rollennahtschweißen gef{\"u}gt. Zur Herstellung der mehrschaligen Bauelemente wurden Rollpunktn{\"a}hte genutzt, welche strukturerhaltend hergestellt wurden. Dazu sind neuartige Rollennahtelektroden entwickelt, gefertigt und erprobt worden. Die notwendigen Schweißparameter zum strukturerhaltenden Schweißen und zum Schweißen mit Verformung der Struktur wurden in schweißbereichsdiagrammen dokumentiert und die Verbindungseigenschaften durch Zugversuche und Metallografie qualifiziert. F{\"u}r die genannten Anwendungsbereiche wurden Dichtn{\"a}hte an den Randbereichen der Bleche hergestellt. Durch die {\"U}berpr{\"u}fung der Dichtheit, der Druck- und Korrosionsbest{\"a}ndigkeit wurden die mehrschaligen Bauelemente f{\"u}r m{\"o}gliche Anwender qualifiziert. F{\"u}r die durchgef{\"u}hrten Recherchen und Untersuchungen wurde ein wissenschaftlicher Mitarbeiter in Vollzeit besch{\"a}ftigt und durch eine studentische Hilfskraft, sowie einen Techniker unterst{\"u}tzt. Die geleistete Arbeit entspricht im vollen Umfang dem begutachteten und bewilligten Antrag und war f{\"u}r die Durchf{\"u}hrung des Vorhabens notwendig und angemessen.}, language = {de} } @inproceedings{SchleussBrobeckOssenbrinketal., author = {Schleuß, Leander and Brobeck, Andreas F. W. and Ossenbrink, Ralf and Polzin, Ralf and Michailov, Vesselin}, title = {Neuartige Elektroden zum Rollennahtschweißen mit nichtlinearem Schweißpfad}, series = {Große Schweißtechnische Tagung, 15.-17.09.15}, booktitle = {Große Schweißtechnische Tagung, 15.-17.09.15}, publisher = {DVS Media}, address = {D{\"u}sseldorf}, isbn = {978-3-945023-46-4}, pages = {185 -- 190}, abstract = {Beim Rollennahtschweißen von Blechen mit eingebrachten Versteifungselementen wie Sicken oder regelm{\"a}ßig angeordneten Strukturen f{\"u}hren lineare Schweißpfade unter Verwendung klassischer Rollenelektroden zur teilweisen bzw. vollst{\"a}ndigen Einebnung dieser Versteifungselemente. Dadurch kann die positive Wirkung der Versteifungselemente reduziert bzw. vollst{\"a}ndig aufgehoben werden. Somit m{\"u}ssen neue Wege f{\"u}r das Rollennahtschweißen von gesickten oder strukturierten Blechen erarbeitet werden. Es wurden zwei neuartige Elektroden mit ver{\"a}nderten Geometrien an den Kontaktfl{\"a}chen entwickelt, welche die Topologie der Bleche ber{\"u}cksichtigen und eine Einebnung vermeiden. Eine der Elektroden besitzt eine periodisch unterbrochene Kontaktfl{\"a}che, die zweite eine laterale Profilierung mit in Schweißrichtung nichtlinearer Form der Kontaktfl{\"a}che. Das Verhalten beim Schweißen wurde durch Schweißversuche bestimmt. Es wurden Schweißbereichsdiagramme bzw. Prozessfenster abgeleitet. Die Verbindungseigenschaften wurden durch Metallografie-, Festigkeits-, Druck- und Dichtheitsuntersuchungen validiert. Als Vergleich und Referenz dienen Schweißuntersuchungen mit konventionellen Rollennahtelektroden. Die geschweißten Bleche haben Wabenstrukturen als regelm{\"a}ßig angeordnete Versteifungselemente mit unterschiedlichen Elementtiefen. Diese Bleche finden vorrangig Anwendung im Fahrzeugbau, in der Investitionsg{\"u}terindustrie und im Bauwesen. Aufgrund dieser Branchen und f{\"u}r zuk{\"u}nftige Anwendungen im W{\"a}rmetauscher- und Beh{\"a}lterbau sowie zur Ermittlung grundlegender Kenntnisse wurden die Untersuchungen an Werkstoffqualit{\"a}ten DC04 und 1.4301 mit Blechdicken von 0,5 mm und 0,7 mm durchgef{\"u}hrt. Die Untersuchungsergebnisse zeigen Unterschiede bei den Prozessparametern und der Auspr{\"a}gung der Verbindung in Abh{\"a}ngigkeit von der geschweißten Struktur, dem ausgew{\"a}hlten Schweißpfad und des geschweißten Werkstoffes gegen{\"u}ber den Referenzschweißungen. Eine anschließende Optimierung f{\"u}hrte zu einer vergleichbar guten Schweißnahtqualit{\"a}t sowohl bei Erhalt der Versteifungselemente mit den neuen Elektroden als auch bei deren Einebnung mit konventionellen Elektroden in Referenz zu Schweißuntersuchungen am ebenen Blech.}, language = {de} } @inproceedings{SchleussBrobeckOssenbrinketal., author = {Schleuß, Leander and Brobeck, Andreas F. W. and Ossenbrink, Ralf and Polzin, Ralf and Michailov, Vesselin}, title = {Rollennahtschweißen strukturierter Bleche mit neuartigen Elektroden}, series = {Widerstandsschweißen, 23. Sondertagung in Duisburg am 29. und 30. Juni 2016}, booktitle = {Widerstandsschweißen, 23. Sondertagung in Duisburg am 29. und 30. Juni 2016}, publisher = {DVS Media GmbH}, address = {D{\"u}sseldorf}, isbn = {978-3-945023-75-4}, pages = {230 -- 240}, abstract = {Bleche mit regelm{\"a}ßig angeordneten steifigkeitserh{\"o}henden Strukturen werden zunehmend in Kon-struktionen zur Erh{\"o}hung der Steifigkeit d{\"u}nner Bleche bzw. von kompletten Bauteilen verwendet. Damit diese Bauteile wirtschaftlich verarbeitet werden k{\"o}nnen, bietet das Rollennahtschweißen mit seinen hohen Prozessgeschwindigkeiten und ohne notwendigen Einsatz von Zusatzwerkstoffen bzw. Schweißhilfsstoffen eine kosteng{\"u}nstige Alternative zu anderen Verfahren. Beim Rollennahtschweißen strukturierter Bleche f{\"u}hren jedoch klassische Rollennahtelektroden zur teilweisen bzw. vollst{\"a}ndigen Einebnung der Versteifungselemente, sodass deren positive Wirkung reduziert bzw. vollst{\"a}ndig auf-gehoben werden kann. Die geschweißten Bleche haben Wabenstrukturen mit unterschiedlichen Elementtiefen als regelm{\"a}ßig angeordnete Versteifungselemente. Die Bleche finden vorrangig Anwendung im Fahrzeugbau und im Bauwesen. Aufgrund dieser Branchen und f{\"u}r zuk{\"u}nftige Anwendungen im W{\"a}rmetauscher- und Beh{\"a}l-terbau wurden die Untersuchungen an Werkstoffqualit{\"a}ten DC04 und X5CrNi 18-10 mit Blechdicken von 0,5 mm und 0,7 mm durchgef{\"u}hrt. Die entwickelten neuartigen Elektroden ber{\"u}cksichtigen die Topologie der Bleche, um eine Einebnung der strukturierten Bleche zu vermeiden. Daher wurden Elektroden mit ver{\"a}nderten Geometrien an den Elektrodenarbeitsfl{\"a}chen gestaltet. Eine der Elektroden besitzt eine periodisch unterbrochene und die zweite eine laterale Profilierung mit in Schweißrichtung nichtlinearer Form der Elektrodenarbeitsfl{\"a}che. Das Verhalten beim Schweißen wurde in Schweißversuchen bestimmt und Schweißbereichsdiagram-me bzw. Prozessfenster abgeleitet. Die Verbindungseigenschaften wurden durch Metallografie-, Fes-tigkeits-, Druck- und Dichtheitsuntersuchungen validiert. Als Vergleich und Referenz dienen Schweiß-untersuchungen mit konventionellen Rollennahtelektroden. Die Untersuchungsergebnisse zeigen Unterschiede bei den Prozessparametern und der Auspr{\"a}gung der Verbindung in Abh{\"a}ngigkeit von der geschweißten Struktur, dem ausgew{\"a}hlten Schweißpfad und des geschweißten Werkstoffes gegen{\"u}ber den Referenzschweißungen. Eine anschließende Optimie-rung f{\"u}hrte zu einer vergleichbar guten Schweißnahtqualit{\"a}t sowohl bei Erhalt der Versteifungselemen-te mit den neuen Elektroden als auch bei deren Einebnung mit konventionellen Elektroden in Referenz zu Schweißuntersuchungen am ebenen Blech. Anschließend wurde ein Vergleich der Verbindungsfestigkeiten mit dem Widerstandspunktschweißen und dem Metall-Aktivgas-Schweißen durchgef{\"u}hrt.}, language = {de} } @inproceedings{SchleussSpringerZoekeetal., author = {Schleuß, Leander and Springer, Katrin and Zoeke, J{\"o}rg and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Qualifizierung von w{\"a}rmearmen MSG-Schweißverfahren f{\"u}r Leichtbaukonstruktionen mit strukturierten Halbzeugen}, series = {Internationaler Fachkongress der Schweiß- und Verbindungstechnik Join-Ex 2012 Wien, 10. + 11. Oktober 2012, Congress Center der Messe Wien}, booktitle = {Internationaler Fachkongress der Schweiß- und Verbindungstechnik Join-Ex 2012 Wien, 10. + 11. Oktober 2012, Congress Center der Messe Wien}, publisher = {Schweißtechnische Zentralanstalt e.V.}, address = {Wien}, pages = {75 -- 83}, language = {de} } @misc{KazakSchleussOssenbrinketal., author = {Kazak, Fedor and Schleuß, Leander and Ossenbrink, Ralf and Michailov, Vesselin and Weiß, Sabine}, title = {Particularities of testing structured sheet metals in 3-point bending tests}, series = {Materials Testing}, volume = {58}, journal = {Materials Testing}, number = {6}, issn = {0025-5300}, doi = {10.3139/120.110883}, pages = {495 -- 500}, abstract = {Thin sheet metals from deep drawing steel DC04 are very often used in the production of car body and case parts. Quality improvement of sheet metal components by new constructive solutions (structuring) as well as adapted joining technology is going on. Structured sheet metals differ from each other by their high bending stiffness. At the same time, they show certain anisotropy due to the structure. Therefore a typical testing method of structured semi-finished parts (single sheet metals, sandwiches)is the bending test. The literature review revealed that in many studies no special demands on tests of structured materials were made. This concerns particularly the structure arrangement, structure direction and structure location of the specimen relative to the mandrel position during bending tests, i. e., the direction of the fixed load relative to the structure. The aim of this study was to determine the influence of the test specification on flexural behavior. In the present paper, honeycomb-structured sheet metals were examined using 3-point bending tests. Bending stiffness and lightweight potential were calculated with respect to the location of load application and compared for different structure arrangements,directions and locations. The influence of the anisotropy on flexural behavior of the honeycomb-patterned sheet metals was moderate.}, language = {en} } @misc{JakobsenZhangDoynovetal., author = {Jakobsen, Daniel and Zhang, Wei and Doynov, Nikolay and B{\"o}hm, Anna and Malzbender, J{\"u}rgen and Michailov, Vesselin and Roosen, Andreas}, title = {Thermal shock behaviour of laminated multilayer refractories for steel casting applications reinforced by residual stresses}, series = {Ceramics International}, volume = {42}, journal = {Ceramics International}, number = {12}, issn = {0272-8842}, doi = {10.1016/j.ceramint.2016.05.149}, pages = {13562 -- 13571}, language = {en} } @misc{ZhangDoynovOssenbrinketal., author = {Zhang, Wei and Doynov, Nikolay and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Physical and FE-Simulation of Thermal Shock Behaviour of Refractory Ceramics}, series = {refractories WORLDFORUM}, volume = {8}, journal = {refractories WORLDFORUM}, number = {2}, issn = {1868-2405}, pages = {110 -- 117}, language = {en} } @inproceedings{ZhangPrieferOleninaetal., author = {Zhang, Wei and Priefer, Marian and Olenina, Mariia and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Additive manufacturing by laser beam build-up welding}, series = {6th International Conference on Additive Technologies - iCAT 2016, N{\"u}rnberg, Germany, 29. - 30. November 2016}, booktitle = {6th International Conference on Additive Technologies - iCAT 2016, N{\"u}rnberg, Germany, 29. - 30. November 2016}, isbn = {978-961-285-537-6}, pages = {324 -- 327}, language = {en} } @inproceedings{ZhangSchrammKaneneksetal., author = {Zhang, Wei and Schramm, Maximilian and Kaneneks, Michael and Michailov, Vesselin and Fleischhauer, Matthias}, title = {Laserstrahl-Auftragschweißen mit pulverf{\"o}rmigen keramischen und metallischen Zusatzwerkstoffen zur Herstellung von Gradientenwerkstoffen}, series = {Große Schweißtechnische Tagung, N{\"u}rnberg, 15. - 17. September 2015}, booktitle = {Große Schweißtechnische Tagung, N{\"u}rnberg, 15. - 17. September 2015}, publisher = {DVS Media}, address = {D{\"u}sseldorf}, isbn = {978-3-945023-46-4}, pages = {842 -- 845}, language = {de} } @inproceedings{ZhangDoynovOssenbrinketal., author = {Zhang, Wei and Doynov, Nikolay and Ossenbrink, Ralf and Michailov, Vesselin and Scheithauer, Uwe and Michaelis, Alexander}, title = {Investigation of thermal shock behaviour of refractory ceramics based on the calcium-aluminate}, series = {14th Biennial Worldwide Congress Unified International Technical Conference on Refractories (UNITECR) 2015, Vienna, Austria, September 15-18, 2015}, booktitle = {14th Biennial Worldwide Congress Unified International Technical Conference on Refractories (UNITECR) 2015, Vienna, Austria, September 15-18, 2015}, address = {Hannover}, isbn = {978-3-9815813-1-7}, language = {en} } @misc{AtangaZhangDreibatietal., author = {Atanga, Valetine Kubong and Zhang, Wei and Dreibati, Ossama and Doynov, Nikolay and Ossenbrink, Ralf and Michailov, Vesselin and Scheffler, Michael}, title = {Alumina-mullite Materials for Refractory Applications: Microstructure, Physical and Finite Element Simulation of Thermal Shock Behaviour}, series = {refractories WORLDFORUM}, volume = {4}, journal = {refractories WORLDFORUM}, number = {1}, issn = {1868-2405}, pages = {159 -- 164}, language = {en} } @misc{HantelmannFritzscheMichailovetal., author = {Hantelmann, Cord and Fritzsche, Sebastian and Michailov, Vesselin and Boywitt, Ralf and Risse, Steffen and Paulinus, Dietmar}, title = {Utilisation of aluminium foam sandwich components in welded structures}, series = {Welding and Cutting}, journal = {Welding and Cutting}, number = {5}, issn = {1612-3433}, pages = {317 -- 325}, language = {en} } @misc{HantelmannFritzscheMichailovetal., author = {Hantelmann, Cord and Fritzsche, Sebastian and Michailov, Vesselin and Boywitt, Ralf and Risse, Steffen and Paulinus, Dietmar}, title = {Einsatz von Aluminiumschaum-Sandwich-Bauteilen in Schweißkonstruktionen}, series = {Schweissen und Scheiden}, volume = {68}, journal = {Schweissen und Scheiden}, number = {3}, issn = {0036-7184}, pages = {106 -- 114}, language = {de} } @misc{GenchevDoynovOssenbrinketal., author = {Genchev, Gancho Vladimirov and Doynov, Nikolay and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Modelling the Local Microstructure Properties due to Multi-Pass Welding}, series = {Materials Science Forum}, volume = {Vol. 879}, journal = {Materials Science Forum}, issn = {0255-5476}, doi = {10.4028/www.scientific.net/MSF.879.595}, pages = {595 -- 600}, language = {en} } @misc{MichailovDoynov, author = {Michailov, Vesselin and Doynov, Nikolay}, title = {Analytical-Numerical Modeling Approach for Calculation of the Structural Distortions after Welding and Thermal Straightening}, series = {Journal of Mechanics Engineering and Automation}, volume = {6}, journal = {Journal of Mechanics Engineering and Automation}, number = {5}, issn = {2159-5283}, doi = {10.17265/2159-5275/2016.05.004}, pages = {246 -- 253}, language = {en} } @inproceedings{HantelmannFritzscheMichailovetal., author = {Hantelmann, Cord and Fritzsche, Sebastian and Michailov, Vesselin and Paulinus, Dietmar}, title = {Einsatz von Aluminiumschaumsandwich in Schweißkonstruktionen}, series = {DVS Congress 2014, Große Schweißtechnische Tagung, DVS-Studentenkongress, Vortr{\"a}ge der Veranstaltungen in Berlin am 15. und 16. September 2014}, booktitle = {DVS Congress 2014, Große Schweißtechnische Tagung, DVS-Studentenkongress, Vortr{\"a}ge der Veranstaltungen in Berlin am 15. und 16. September 2014}, publisher = {DVS Media GmbH}, address = {D{\"u}sseldorf}, isbn = {978-3-945023-03-7}, language = {de} } @inproceedings{SeidlitzFritzscheSchleussetal., author = {Seidlitz, Holger and Fritzsche, Sebastian and Schleuß, Leander and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Neuartige F{\"u}getechnologie zum Herstellen von hochbelastbaren Multi-Material-Bauweisen aus textilverst{\"a}rkten Kunststoffen und Metallen bei einseitiger Zug{\"a}nglichkeit der F{\"u}gestelle}, series = {DVS Congress 2016, Große Schweißtechnische Tagung, Vortr{\"a}ge der Veranstaltungen in Leipzig am 19. und 20. September 2016}, booktitle = {DVS Congress 2016, Große Schweißtechnische Tagung, Vortr{\"a}ge der Veranstaltungen in Leipzig am 19. und 20. September 2016}, publisher = {DVS-Verlag}, address = {D{\"u}sseldorf}, isbn = {978-3-945023-74-7}, pages = {424 -- 428}, language = {de} } @misc{KoltsovaMichailov, author = {Koltsova, Tatiana S. and Michailov, Vesselin}, title = {Hybrid Composite Materials Aluminum-Carbon Nanostructures}, series = {Materials science medziagotyra}, volume = {21}, journal = {Materials science medziagotyra}, number = {3}, issn = {1392-1320}, pages = {372 -- 375}, language = {en} } @misc{KoltsovaTolochkoMichailov, author = {Koltsova, Tatiana S. and Tolochko, Oleg V. and Michailov, Vesselin}, title = {Effect of hot pressing modes on the structure and properties of an aluminum-carbon nanofibers' composite material}, series = {Metal Science and Heat Treatment}, volume = {56}, journal = {Metal Science and Heat Treatment}, number = {9-10}, issn = {0026-0673}, doi = {10.1007/s11041-015-9793-6}, pages = {525 -- 530}, language = {en} } @inproceedings{NaumovChenikovGolubevetal., author = {Naumov, Anton and Chenikov, Evgenii V. and Golubev, Iurii and Michailov, Vesselin}, title = {Numerical simulation and microstructure analysis of friction stir welded Al 6082}, series = {METAL 2015, 24th International Conference on Metallurgy and Materials, conference proceedings, June 3rd-5th 2015, Brno}, booktitle = {METAL 2015, 24th International Conference on Metallurgy and Materials, conference proceedings, June 3rd-5th 2015, Brno}, publisher = {Tanger}, address = {Ostrava}, isbn = {978-80-87294-62-8}, language = {en} } @inproceedings{GenchevDoynovOssenbrinketal., author = {Genchev, Gancho Vladimirov and Doynov, Nikolay and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Schweißtechnische Simulation der lokalen Eigenschaften in der W{\"a}rmeeinflusszone von Mehrlagenschweißungen}, series = {ANSYS Conference \& 33rd CADFEM Users' Meeting, 24. - 26. Juni, Bremen, conference proceedings}, booktitle = {ANSYS Conference \& 33rd CADFEM Users' Meeting, 24. - 26. Juni, Bremen, conference proceedings}, publisher = {CADFEM GmbH}, address = {Grafing}, language = {de} } @inproceedings{DoynovKukeMichailov, author = {Doynov, Nikolay and Kuke, Felix and Michailov, Vesselin}, title = {Thermal straightening simulation of welded structures}, series = {Proceedings, METEC \& 2nd ESTAD 2015, European Steel Technology and Application Days, D{\"u}sseldorf, Germany, CCD Congress Center D{\"u}sseldorf, 15 - 19 June 2015}, booktitle = {Proceedings, METEC \& 2nd ESTAD 2015, European Steel Technology and Application Days, D{\"u}sseldorf, Germany, CCD Congress Center D{\"u}sseldorf, 15 - 19 June 2015}, publisher = {TEMA Technologie Marketing AG}, address = {Aachen}, isbn = {978-3-00-049542-7}, pages = {P 709, 1 -- 6}, language = {en} } @inproceedings{FritzscheSeidlitzWinkelmannetal., author = {Fritzsche, Sebastian and Seidlitz, Holger and Winkelmann, Kai and Michailov, Vesselin}, title = {Structural reinforced FRP sandwich constructions for lightweight floor panels}, series = {Conference papers, APT '15, 11th International Conference Advances in Plastics Technology, Sosnowiec, 13 - 15 October 2015}, booktitle = {Conference papers, APT '15, 11th International Conference Advances in Plastics Technology, Sosnowiec, 13 - 15 October 2015}, editor = {Pająk, Anna}, address = {Gliwice}, isbn = {978-83-63555-47-4}, language = {en} } @inproceedings{GolubevNaumovMichailov, author = {Golubev, Iurii and Naumov, Anton and Michailov, Vesselin}, title = {Developing finite element model of the friction stir welding for temperature calculation}, series = {METAL 2014, International Conference on Metallurgy and Materials, May 21 st - 23rd 2014, Brno}, booktitle = {METAL 2014, International Conference on Metallurgy and Materials, May 21 st - 23rd 2014, Brno}, isbn = {978-80-87294-54-3}, pages = {1242 -- 1248}, language = {en} } @misc{GenchevDoynovOssenbrinketal., author = {Genchev, Gancho Vladimirov and Doynov, Nikolay and Ossenbrink, Ralf and Bokuchava, Gizo and Petrov, Peter and Michailov, Vesselin}, title = {Numerical and Experimental Study of Residual Stress Distribution in Laser Beam Welded Joint}, pages = {S. 20}, language = {en} } @misc{Michailov, author = {Michailov, Vesselin}, title = {Prediction of the Properties of Heat-Affected Zone of Welded Joints of Sheets from Aluminum Alloys with Structured Surface}, series = {Metal Science and Heat Treatment}, volume = {58}, journal = {Metal Science and Heat Treatment}, number = {1-2}, issn = {0026-0673}, pages = {46 -- 50}, language = {en} } @misc{KarkhinGarkovMichailov, author = {Karkhin, Victor A. and Garkov, Sergey Vladimirovich and Michailov, Vesselin}, title = {Calculation of thermal processes in welding thick plates with moving axisymmetric heat sources}, series = {Welding International}, volume = {30}, journal = {Welding International}, number = {9}, issn = {0950-7116}, pages = {708 -- 711}, language = {en} } @inproceedings{IvanovPanchenkoKarkhinetal., author = {Ivanov, Sergey Y. and Panchenko, Oleg V. and Karkhin, Victor A. and Michailov, Vesselin and Velichko, Olga V.}, title = {Comparative study of mechanical inhomogeneity of laser and friction stir welded joints of Al-Mg-Si alloy}, series = {METAL 2015, 24th International Conference on Metallurgy and Materials, conference proceedings, June 3rd-5th 2015, Brno}, booktitle = {METAL 2015, 24th International Conference on Metallurgy and Materials, conference proceedings, June 3rd-5th 2015, Brno}, publisher = {Tanger}, address = {Ostrava}, isbn = {978-80-87294-62-8}, language = {en} } @inproceedings{KukeKloshekMichailov, author = {Kuke, Felix and Kloshek, Alexander and Michailov, Vesselin}, title = {Untersuchung des Einflusses von rohrf{\"o}rmigen Stahlelektroden auf das Prozessverhalten und den Werkstoff{\"u}bergang beim MSG-Schweißen}, series = {DVS Congress, September 2015, N{\"u}rnberg}, booktitle = {DVS Congress, September 2015, N{\"u}rnberg}, publisher = {DVS Media GmbH}, address = {D{\"u}sseldorf}, isbn = {978-3-945023-46-4}, pages = {615 -- 620}, language = {de} } @inproceedings{NaumovChenikovGolubevetal., author = {Naumov, Anton and Chenikov, Evgenii V. and Golubev, Iurii and Michailov, Vesselin}, title = {Research of temperature distribution during friction stir welding of 2 mm Aw 6082 sheets}, series = {METAL 2015, 24th International Conference on Metallurgy and Materials, conference proceedings, June 3rd-5th 2015, Brno}, booktitle = {METAL 2015, 24th International Conference on Metallurgy and Materials, conference proceedings, June 3rd-5th 2015, Brno}, publisher = {Tanger}, address = {Ostrava}, isbn = {978-80-87294-62-8}, pages = {651 -- 653}, language = {en} } @misc{SchleussRichterOssenbrinketal., author = {Schleuß, Leander and Richter, Thomas and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Plasma Cutting of Structured Sheet Metals in Comparison with Laser Beam Cutting}, series = {Journal of Materials Science and Engineering}, volume = {5}, journal = {Journal of Materials Science and Engineering}, number = {3-4}, issn = {2161-6221}, doi = {10.17265/2161-6221/2015.3-4.004}, pages = {135 -- 144}, language = {en} } @book{MichailovKarkhinPetrov, author = {Michailov, Vesselin and Karkhin, Victor A. and Petrov, Peter}, title = {Principles of welding}, publisher = {Polytechnic Univ. Publ.}, address = {St. Petersburg}, isbn = {978-5-7422-5569-7}, pages = {283}, language = {en} } @inproceedings{PetrovBokuchavaPapushkinetal., author = {Petrov, Peter and Bokuchava, Gizo and Papushkin, Igor and Genchev, Gancho Vladimirov and Doynov, Nikolay and Michailov, Vesselin and Ormanova, Maria}, title = {Neutron diffraction studies of laser welding residual stresses}, series = {19th International Conference and School on Quantum Electronics: Laser Physics and Applications, 26-30 September 2016 Sozopol, Bulgaria}, booktitle = {19th International Conference and School on Quantum Electronics: Laser Physics and Applications, 26-30 September 2016 Sozopol, Bulgaria}, publisher = {SPIE}, address = {Bellingham, Wash.}, isbn = {978-1-5106-0953-2}, doi = {10.1117/12.2261802}, language = {en} } @misc{NikitinSchleussOssenbrinketal., author = {Nikitin, Alexander and Schleuß, Leander and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Corrosion Behavior of Brazed Zinc-Coated Structured Sheet Metal}, series = {International Journal of Corrosion}, volume = {2017}, journal = {International Journal of Corrosion}, issn = {1687-9333}, doi = {10.1155/2017/4768505}, pages = {4768505}, language = {en} } @incollection{TolochkoMichailovRudskoy, author = {Tolochko, Oleg V. and Michailov, Vesselin and Rudskoy, Andrey I.}, title = {Metal Matrix/Nanocarbons Composites Based on Copper and Aluminum}, series = {Industry 4.0 : Entrepreneurship and Structural Change in the New Digital Landscape}, booktitle = {Industry 4.0 : Entrepreneurship and Structural Change in the New Digital Landscape}, editor = {Devezas, Tessaleno and Leit{\~a}o, Jo{\~a}o and Sarygulov, Askar}, publisher = {Springer International Publishing}, address = {Cham}, isbn = {978-3-319-49604-7}, pages = {205 -- 217}, language = {en} } @misc{IvanovKarkhinMichailovetal., author = {Ivanov, Sergey Y. and Karkhin, Victor A. and Michailov, Vesselin and Martikainen, J. and Hiltunen, E.}, title = {Modellierung der Entstehung von Heißrissen beim Laserschweißen von Al-Mg-Si-Legierungen}, series = {Izvestija Tul'skogo Gosudarstvennogo Universiteta}, volume = {6}, journal = {Izvestija Tul'skogo Gosudarstvennogo Universiteta}, number = {2}, issn = {2071-6168}, pages = {66 -- 74}, language = {ru} } @misc{IvanovKarkhinMichailov, author = {Ivanov, Sergey Y. and Karkhin, Victor A. and Michailov, Vesselin}, title = {Modellierung thermodynamischer Prozesse beim Schweißen von ungeraden N{\"a}hten}, series = {Izvestija Tul'skogo Gosudarstvennogo Universiteta}, volume = {6}, journal = {Izvestija Tul'skogo Gosudarstvennogo Universiteta}, number = {2}, issn = {2071-6168}, pages = {62 -- 66}, language = {ru} } @inproceedings{KloshekKaneneksDuedingetal., author = {Kloshek, Alexander and Kaneneks, Michael and D{\"u}ding, Michael and Wolf, Matthias and Michailov, Vesselin}, title = {Unterpulverschweißen in Steig- und Querposition}, series = {Tagungsband, 24. Schweißtechnische Fachtagung, Halle (Saale), 05.11.2014}, booktitle = {Tagungsband, 24. Schweißtechnische Fachtagung, Halle (Saale), 05.11.2014}, publisher = {Schweißtechnische Lehr- und Versuchsanstalt}, address = {Halle/Saale}, pages = {51 -- 58}, language = {de} } @misc{IsupovGaninTcemenkoetal., author = {Isupov, Fedor and Ganin, Sergey and Tcemenko, Valeriy and Michailov, Vesselin}, title = {Numerical simulation of sheet profiling process from aluminum alloy}, series = {METAL 2015, 24th International Conference on Metallurgy and Materials, Brno, Czech Republic, June 3rd-5th, 2015, Conference proceedings}, journal = {METAL 2015, 24th International Conference on Metallurgy and Materials, Brno, Czech Republic, June 3rd-5th, 2015, Conference proceedings}, publisher = {Tanger}, address = {Ostrava}, isbn = {978-80-87294-62-8}, pages = {1463 -- 1468}, language = {en} } @inproceedings{GolubevNaumovChernikovetal., author = {Golubev, Iurii and Naumov, Anton and Chernikov, Evgenii V. and Michailov, Vesselin}, title = {Temperature distribution and welding distortion measurements after FSW of Al 6082-T6 sheets}, series = {Friction Stir Welding and Processing VIII, 144th Annual Meeting and Exhibition, 15.03.2015, Orlando}, booktitle = {Friction Stir Welding and Processing VIII, 144th Annual Meeting and Exhibition, 15.03.2015, Orlando}, editor = {Mishra, Rajiv S. and Mahoney, Murray W. and Sato, Yutaka and Hovanski, Yuri}, publisher = {Springer}, address = {Cham}, isbn = {978-3-319-48604-8}, doi = {10.1007/978-3-319-48173-9}, pages = {289 -- 295}, language = {en} } @inproceedings{IvanovPanchenkoKarkhinetal., author = {Ivanov, Sergey Y. and Panchenko, Oleg V. and Karkhin, Victor A. and Michailov, Vesselin}, title = {Optimization technique for arc welding of structured sheet}, series = {METAL 2015, 24th International Conference on Metallurgy and Materials, conference proceedings, June 3rd-5th 2015, Brno}, booktitle = {METAL 2015, 24th International Conference on Metallurgy and Materials, conference proceedings, June 3rd-5th 2015, Brno}, publisher = {Tanger}, address = {Ostrava}, isbn = {978-80-87294-62-8}, language = {en} } @book{MichailovStapelfeld, author = {Michailov, Vesselin and Stapelfeld, Christoph}, title = {Erweiterung eines analytisch-numerischen Hybridmodells f{\"u}r die Verzugssimulation von Großstrukturen}, publisher = {Verlag und Vertriebsgesellschaft mbH}, address = {D{\"u}sseldorf}, isbn = {978-3-942541-35-0}, pages = {132}, language = {de} } @misc{KoltsovaShakovVoznyakovskiyetal., author = {Koltsova, Tatiana S. and Shakov, Fedor M. and Voznyakovskiy, A. A. and Lyashkov, A. I. and Tolochko, Oleg V. and Rudskoy, Andrey I. and Nasibulin, Albert G. and Michailov, Vesselin}, title = {Fabrication of a Compacted Aluminum-Carbon Nanofiber Material by Hot Pressin}, series = {Technical Physics}, volume = {59}, journal = {Technical Physics}, number = {11}, issn = {1063-7842}, doi = {10.1134/S1063784214110139}, pages = {1626 -- 1630}, language = {en} } @inproceedings{KrawczynskiDoynovMichailov, author = {Krawczynski, Damian and Doynov, Nikolay and Michailov, Vesselin}, title = {Minimization of Residual Welding Stress and Distortins in Aluminium-Steel Hybrid Structure}, series = {Innowacje w procesach produkcyjnych, technologicznych i bezpieczeństwie : XXXVIII Studencka Sesja Naukowa, Częstochowa, 29 maj 2014 : praca zbiorowa}, booktitle = {Innowacje w procesach produkcyjnych, technologicznych i bezpieczeństwie : XXXVIII Studencka Sesja Naukowa, Częstochowa, 29 maj 2014 : praca zbiorowa}, publisher = {Wydawnictwo Wydziału Inżynierii Produkcji i Technologii Materiał{\´o}w Politechniki Częstochowskie}, address = {Częstochowa}, isbn = {879-83-63989-02-6}, pages = {59 -- 63}, language = {en} } @misc{BobryninaAlkhalafShamshurinetal., author = {Bobrynina, Elizaveta and Alkhalaf, Ahmad A. and Shamshurin, Aleksey and Tolochko, Oleg V. and Michailov, Vesselin}, title = {Synthesis of Fe-ZrO2 composite powders by thermochemical method}, series = {Key Engineering Materials}, volume = {721}, journal = {Key Engineering Materials}, issn = {1662-9795}, doi = {10.4028/www.scientific.net/KEM.721.285}, pages = {285 -- 289}, language = {en} } @misc{HartelIlinSonntagetal., author = {Hartel, Udo and Ilin, Alexander and Sonntag, Steffen and Michailov, Vesselin}, title = {Nonlinear optimization methods for the determination of heat source model parameters}, series = {Materials Science Forum}, volume = {879}, journal = {Materials Science Forum}, issn = {1662-9752}, doi = {10.4028/www.scientific.net/MSF.879.2008}, pages = {2008 -- 2013}, language = {en} } @misc{HartelIlinMichailovetal., author = {Hartel, Udo and Ilin, Alexander and Michailov, Vesselin and Gibmeier, Jens and Bantel, Christoph}, title = {Finite Element Modelling for the Structural Analysis of Al-Cu Laser Beam Welding}, series = {Physics Procedia}, volume = {83}, journal = {Physics Procedia}, issn = {1875-3892}, doi = {10.1016/j.phpro.2016.08.147}, pages = {1404 -- 1414}, language = {en} } @inproceedings{ZhangPrieferOssenbrinketal., author = {Zhang, Wei and Priefer, Marian and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Neue M{\"o}glichkeiten f{\"u}r die Additive Fertigung durch Laser-Pulver-Auftragschweißen}, series = {DVS Congress 2017, Große Schweißtechnische Tagung, DVS Studentenkongress, Vortr{\"a}ge der Veranstaltungen in D{\"u}sseldorf vom 26. bis 29. September 2017}, booktitle = {DVS Congress 2017, Große Schweißtechnische Tagung, DVS Studentenkongress, Vortr{\"a}ge der Veranstaltungen in D{\"u}sseldorf vom 26. bis 29. September 2017}, publisher = {DVS Media}, address = {D{\"u}sseldorf}, isbn = {978-3-96144-008-5}, pages = {278 -- 282}, language = {de} } @misc{GenchevDoynovOssenbrinketal., author = {Genchev, Gancho Vladimirov and Doynov, Nikolay and Ossenbrink, Ralf and Michailov, Vesselin and Bokuchava, Gizo and Petrov, Peter}, title = {Residual stresses formation in multi-pass weldment: A numerical and experimental study}, series = {Journal of Constructional Steel Research}, volume = {138}, journal = {Journal of Constructional Steel Research}, issn = {0143-974X}, doi = {10.1016/j.jcsr.2017.08.017}, pages = {633 -- 641}, abstract = {In this study, the residual stresses distribution induced by multi-pass arc welding of the steel S355J2+N are investigated experimentally and numerically. An extended approach is used for the simulations, which considers the change of the local microstructure properties due to multiple reheating. Experimental material data obtained from physical welding simulations with Gleeble® are used for the model calibration. The experimental stress study is performed using a neutron diffraction method on a fourier stress diffractometer. Numerical analysis of the welding stresses formation in the weldment is performed and compared to the experimental study. The results explain the influence of the welding thermal history on the resulting local thermo-mechanical properties in the heat-affected zone and, thus, on the residual stress distribution. The consideration of the local microstructure properties in the welding simulation leads to a significant increase in accuracy of the numerical results. The major influence factor on the residual stress formation is the change in the interpass microstructure yield strength. When a root pass with short cooling times is subjected to re-austenitisation in the fine-grained zone, the yield strength increases in this area and affects consequently the residual stress distribution. The influence of the reheating is detectable in the depth of the weldment, but it is less significant for the residual stress formation near the surface of the welded joint.}, language = {en} } @misc{DoynovMichailov, author = {Doynov, Nikolay and Michailov, Vesselin}, title = {Distortion analysis of heat spot straightening thin-walled welded structures: part 2: analytical-numerical approach}, series = {International Journal of Advanced Manufacturing Technology}, volume = {95}, journal = {International Journal of Advanced Manufacturing Technology}, number = {1-4}, issn = {0268-3768}, doi = {10.1007/s00170-017-1214-0}, pages = {469 -- 478}, abstract = {An analytical model based on a theoretical model established in the previous work (part 1) is developed. The analytical model considers the particular case of an instantaneous high-density heat source acting on a thin pre-stressed plate. It calculates the plastic strain and the area of the zone of plastic deformation. A theoretical study is performed in order to quantify the major factors that influence the plastic strain formation. Furthermore, the work presents a calculation procedure for distortion analysis of lar ge and complex structures, intended to be used for solving industrial tasks. The calculation procedure consists of a combination of the analytical solution and an elastic finite element analysis with the aid of the inherent strain approach. Various aspects of its application are also discussed. The calculation procedure is finally explained using a simple example. Its reliability and practicability are demonstrated through verification and validation studies. The work is dedicated to the thermal straightening of thin-walled welded structures; however, it can also be related to other processes.}, language = {en} } @book{MichailovDoynovKuke, author = {Michailov, Vesselin and Doynov, Nikolay and Kuke, Felix}, title = {Anwendungsnahe Simulation des thermischen Richtens : Forschungsvorhaben P 1008/IGF-Nr. 17970 BR}, publisher = {Verlag und Vertriebsgesellschaft mbH}, address = {D{\"u}sseldorf}, isbn = {978-3-946885-03-0}, pages = {XV, 122}, language = {de} } @misc{KondratyevMorozovaGolubevetal., author = {Kondratyev, Alex and Morozova, Iuliia and Golubev, Iurii and Hantelmann, Cord and Naumov, Alexander and Michailov, Vesselin}, title = {Микроструктура и механические свойства швов после различных режимов импульсной сварки Al - Mg - Si сплавов трением с перемешиванием}, series = {Metallovedenie i termicheskaya obrabotka metallov}, journal = {Metallovedenie i termicheskaya obrabotka metallov}, number = {11}, issn = {0026-0819}, pages = {25 -- 30}, abstract = {Welded joints of aluminum alloy 6082-T6 formed by the method of pulse friction stir welding are studied. The effect of the power and frequency of the pulses on the microstructure and mechanical properties of the welded joints is determined. Application of an additional pulse during the welding affects the surface quality and the shape of the weld, the distribution of the oxide layer and of particles of the hardening phase, and the grain size in the zone of dynamic recrystallization.}, language = {ru} } @misc{IvanovKarkhinMichailov, author = {Ivanov, Sergey Y. and Karkhin, Victor A. and Michailov, Vesselin}, title = {Optimization of welding conditions for curvilinear}, series = {Welding International}, volume = {31}, journal = {Welding International}, number = {12}, issn = {0950-7116}, doi = {10.1080/09507116.2017.1353276}, pages = {929 -- 933}, language = {en} } @misc{DoynovMichailov, author = {Doynov, Nikolay and Michailov, Vesselin}, title = {Distortion analysis of heat spot straightening thin-walled welded structures: part 1: analytical-numerical approach}, series = {The International Journal of Advanced Manufacturing Technology}, volume = {94}, journal = {The International Journal of Advanced Manufacturing Technology}, number = {1-4}, issn = {0268-3768}, doi = {10.1007/s00170-017-0911-z}, pages = {667 -- 676}, abstract = {The work deals with the elastic-plastic thermo-mechanical deformation process after spot heating of large thin plates. It promotes a new theoretical model of the process. The main target is to clarify the kinetics of the plastic strain formation during thermal straightening and to explore the main interactions. For this purpose, a simplified mechanical problem is formulated and applied. As a result, definite thermo-mechanical relations between temperature, initial strain, and accumulated plastic strain are obtained. Finally, a verification study is presented and discussed. The results contribute to extending the knowledge about the process and to establishing a theoretical background for development of applied analytical or analytical-numerical approaches for practical use in the designing and planning phases in welding production. An application to a particular case is described in an accompanying paper (part 2).}, language = {en} } @incollection{GolubevDoynovHantelmannetal., author = {Golubev, Iurii and Doynov, Nikolay and Hantelmann, Cord and Michailov, Vesselin}, title = {W{\"a}rmequellemodell und FE-Temperaturfeldsimulation f{\"u}r das R{\"u}hrreibschweißen}, series = {DVS Congress 2017 : Große Schweißtechnische Tagung : DVS-Studentenkongress : Vortr{\"a}ge der Veranstaltungen in D{\"u}sseldorf vom 26. bis 29. September 2017}, booktitle = {DVS Congress 2017 : Große Schweißtechnische Tagung : DVS-Studentenkongress : Vortr{\"a}ge der Veranstaltungen in D{\"u}sseldorf vom 26. bis 29. September 2017}, publisher = {DVS Media}, address = {D{\"u}sseldorf}, isbn = {978-3-96144-008-5}, pages = {112}, language = {de} } @misc{EvdokimovSpringerDoynovetal., author = {Evdokimov, Anton and Springer, Katrin and Doynov, Nikolay and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Heat source model for laser beam welding of steel-aluminum lap joints}, series = {International Journal of Advanced Manufacturing Technology}, volume = {93}, journal = {International Journal of Advanced Manufacturing Technology}, number = {1-4}, issn = {0268-3768}, doi = {10.1007/s00170-017-0569-6}, pages = {709 -- 716}, abstract = {In this study, a three-dimensional thermal conduction model based on the finite element analysis was established to predict a heat distribution during laser welding in overlap configuration of austenitic stainless steel 1.4301 and hardenable aluminum alloy 6016. A hybrid model based on two expanded curve-rotated volumetric heat sources is suggested to capture the complex weld geometry. Since thermal flow in the overlap area is a crucial part of the model, an analytic calculation of a thermal contact conductance between the plates and its subsequent implementation in the FE model through a superposition of two contact surfaces are described in details in this paper. Full thermal cycles, weld shapes, and thus mixing grades were successfully predicted by means of the developed model for different parameter combinations.}, language = {en} } @misc{ShapovalovHantelmannMichailovetal., author = {Shapovalov, Oleg and Hantelmann, Cord and Michailov, Vesselin and Kodgaspirov, G. E.}, title = {Influence of welding method on fatigue strength and destruction character of aluminum foam sandwiches}, series = {Deformatsiya i Razrushenie materialov}, journal = {Deformatsiya i Razrushenie materialov}, number = {5}, issn = {1814-4632}, abstract = {An influence of the arc welding and the laser welding on fatigue properties and destruction mechanisms of aluminum foam sandwich has been studied. It was found that specimens made by the arc welding had the best fatigue strength. Comparative results of four point bending fatigue tests of the non-welded specimens such as butt welded joints made by different welding methods are presented.}, language = {ru} } @inproceedings{PanchenkoIvanovKol'Tsovaetal., author = {Panchenko, Oleg V. and Ivanov, Sergey Y. and Kol'Tsova, Tatyana and Michailov, Vesselin}, title = {Survivability of Carbon Nanotubes During Arc Welding}, series = {Nanocon 2016, conference proceedings, 8th international conference, October 19th-21st, 2016, Brno, Czech Republic, EU}, booktitle = {Nanocon 2016, conference proceedings, 8th international conference, October 19th-21st, 2016, Brno, Czech Republic, EU}, publisher = {Tanger}, address = {Ostrava}, isbn = {978-80-87294-71-0}, pages = {59 -- 63}, language = {en} } @inproceedings{GolubevMorozovaNaumovetal., author = {Golubev, Iurii and Morozova, Iuliia and Naumov, Anton and Hantelmann, Cord and Doynov, Nikolay and Michailov, Vesselin}, title = {Numerical simulation and experimental investigation on Numerical simulation of 6082-T6 aluminum alloy}, series = {Materials Science and Technology 2017, (MS\&T17), Pittsburgh, Pennsylvania, USA, October 8-12, 2017, volume 2}, booktitle = {Materials Science and Technology 2017, (MS\&T17), Pittsburgh, Pennsylvania, USA, October 8-12, 2017, volume 2}, publisher = {Curran Associates, Inc.}, address = {Red Hook, NY}, isbn = {978-1-5108-5058-3}, pages = {987 -- 994}, abstract = {The series of impulse friction stir welding (IFSW) experiments for aluminum alloy 6082-T6 butt joints was performed to obtain micrographs, tensile and hardness test samples and to receive the validation data for a numerical model of the process. Impulse force and frequency were varied to determine the effect of individual process parameters on microstructure evolution and mechanical properties of the welded butt joints. A three-dimensional model was established to simulate temperature distribution, heat generation and contact state between the tool and the workpiece during IFSW. Based on the numerical simulation, the influence of the impulses on heat input, maximum weld temperatures and contact state was found. The combination of impulse force and frequency effected the grain refinement. The influence of impulses on the elongation and hardness of the welded joints during IFSW were determined.}, language = {en} } @incollection{HantelmannFritzscheMichailovetal., author = {Hantelmann, Cord and Fritzsche, Sebastian and Michailov, Vesselin and Boywitt, Ralf}, title = {Einsatz von Aluminiumschaumsandwich in Schweißkonstruktionen}, series = {DVS Congress 2017 : Große Schweißtechnische Tagung : DVS-Studentenkongress : Vortr{\"a}ge der Veranstaltungen in D{\"u}sseldorf vom 26. bis 29. September 2017}, booktitle = {DVS Congress 2017 : Große Schweißtechnische Tagung : DVS-Studentenkongress : Vortr{\"a}ge der Veranstaltungen in D{\"u}sseldorf vom 26. bis 29. September 2017}, publisher = {DVS Media}, address = {D{\"u}sseldorf}, isbn = {978-3-96144-008-5}, pages = {173}, abstract = {In der vorgestellten Arbeit wird die Anwendbarkeit von Aluminiumschaumsandich in Schweißkonstruktionen vorgestellt. Systematische Betrachtungen zur Schweißbarkeit mittels Laserstrahlschweißen, MSG - Kurzlichtbogen und R{\"u}hrreibschweißen sowohl im gesch{\"a}umten als auch im ungesch{\"a}umten Zustand werden beschrieben. Dazu wurden verschiedene Knotenformen wie I-Stoß- bzw. T-Stoßverbindungen hergestellt und deren mechanischtechnologische Eigenschaften ermittelt. Neben der quasistatischen Pr{\"u}fung, wurde jede Ausf{\"u}hrungsform des Knotens auf deren Schwingfestigkeit hin gepr{\"u}ft und die Anwendbarkeit bestehender Regelwerke wie die FKMRichtlinie oder der Eurocode 9 f{\"u}r die Nachweisf{\"u}hrung betrachtet. Die Ergebnisse sind abschließend in einem Gestaltungskatalog als Hilfsmittel f{\"u}r den Konstrukteur zusammengefasst. Parallel dazu wurden die experimentellen Untersuchungen mittels FEM begleitet. Es wird die FE-Modellentwicklung f{\"u}r die Berechnung des Sandwichverbundes an sich als auch von F{\"u}geknoten dargestellt wie auch die Modellvalidierung mit einem Musterbauteil aus einer Hubarbeitsb{\"u}hne.}, language = {de} } @misc{IvanovKarkhinMichailovetal., author = {Ivanov, Sergey Y. and Karkhin, Victor A. and Michailov, Vesselin and Martikainen, J. and Hiltunen, E.}, title = {Оценка чувствительности сварных соединений Al - Mg - Si-сплавов к ликвационным трещинам при лазерной сварке}, series = {Metallovedenie i termicheskaya obrabotka metallov}, journal = {Metallovedenie i termicheskaya obrabotka metallov}, number = {12}, issn = {0026-0819}, language = {ru} } @misc{EvdokimovObrosovOssenbrinketal., author = {Evdokimov, Anton and Obrosov, Aleksei and Ossenbrink, Ralf and Weiß, Sabine and Michailov, Vesselin}, title = {Mechanical properties of dissimilar steel-aluminum weld}, series = {Materials Science and Engineering: A}, volume = {Volume 722}, journal = {Materials Science and Engineering: A}, issn = {0921-5093}, doi = {https://doi.org/10.1016/j.msea.2018.03.019}, pages = {242 -- 254}, abstract = {Knowledge of the properties of dissimilar welds is of great significance for the development of multi-material lightweight structures. In this study, stainless steel (1.4301) and aluminum alloy (6082-T6) sheets were welded in overlap configuration in keyhole mode. The resulting weld metals were investigated with respect to their mechanical properties. Several samples were cut out of different locations along the welds and their cross-sections were subjected to indentation testing and energy dispersive X-ray (EDS) analysis. Young's modulus E, yield stress σy, and strain hardening exponent n, were determined by means of reverse analysis of the indentation load (P) - depth (h) curves, allowing construction of true stress - true strain relations. An essential increase in yield stress in comparison to the one of the base alloys was observed inside the weld metal. In contrary, Young's modulus and strain hardening exponent of the welds were almost identical to corresponding values of the base steel metal. Due to the sensitivity of yield stress to the aluminum content, slight variations of the welding parameters lead to significant changes in elastic-plastic behavior of the weld metal.}, language = {en} }