@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} } @phdthesis{Ossenbrink, author = {Ossenbrink, Ralf}, title = {Thermomechanische Schweißsimulation unter Ber{\"u}cksichtigung von Gef{\"u}geumwandlungen}, publisher = {Shaker}, address = {Aachen}, isbn = {978-3-8322-8131-1}, pages = {152}, language = {de} } @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} } @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} } @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} } @incollection{OssenbrinkGenchevDoynov, author = {Ossenbrink, Ralf and Genchev, Gancho Vladimirov and Doynov, Nikolay}, title = {Simulation der Schweißeigenspannungen und des -verzuges unter Ber{\"u}cksichtigung der Gef{\"u}geumwandlungen mit dem STAAZ-Modell}, series = {Internationales Symposium Schweißtechnik - Verfahren, Werkstoffe, Simulation, Cottbus, 6. November 2013}, booktitle = {Internationales Symposium Schweißtechnik - Verfahren, Werkstoffe, Simulation, Cottbus, 6. November 2013}, editor = {Michailov, Vesselin}, publisher = {Shaker Verlag}, address = {Aachen}, isbn = {978-3-8440-2319-0}, pages = {149 -- 167}, abstract = {Die vorliegende Arbeit stellt das von Professor Michailov vorgeschlagene Spitzentemperatur-Austenitisierungs- Abk{\"u}hlzeit-Modell f{\"u}r die thermomechanische Schweißsimulation unter Ber{\"u}cksichtigung der Gef{\"u}geumwandlungen vor. Das Modell erfasst die f{\"u}r die Gef{\"u}geausbildung maßgebenden Temperaturzyklen durch seine drei so genannten STAAZ-Parameter: Spitzentemperatur, Austenitisierungs- und Abk{\"u}hlzeit. Die Korrelation dieser Temperaturzyklusparameter mit den thermomechanischen gef{\"u}geabh{\"a}ngigen Werkstoffeigenschaften erfolgt auf Grundlage einer empirischen Datenbasis. Mit der vorgenommenen Erweiterung zu Mehrmalig-(M-)STAAZ l{\"a}sst sich das aus einem vorgelagerten Temperaturzyklus entstandene Zwischengef{\"u}ge ber{\"u}cksichtigen.}, 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} }