TY - GEN A1 - Pittner, Andreas A1 - Schwenk, Christopher A1 - Weiß, D. A1 - Rethmeier, Michael ED - Cerjak, H. ED - Enzinger, N. T1 - An efficient solution of the inverse heat conduction problem for welding simulation T2 - Mathematical modelling of weld phenomena 9 PY - 2010 SN - 978-3-85125-127-2 SP - 761 EP - 791 PB - Verlag der Technischen Universität Graz AN - OPUS4-23154 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Heinze, Christoph A1 - Schwenk, Christopher A1 - Rethmeier, Michael A1 - Caron, J. T1 - Numerical sensitivity analysis of welding-induced residual stress depending on variations in continuous cooling transformation behavior JF - Frontiers of materials science in China N2 - The usage of continuous cooling transformation (CCT) diagrams in numerical welding simulations is state of the art. Nevertheless, specifications provide limits in chemical composition of materials which result in different CCT behavior and CCT diagrams, respectively. Therefore, it is necessary to analyze the influence of variations in CCT diagrams on the developing residual stresses. In the present paper, four CCT diagrams and their effect on numerical calculation of residual stresses are investigated for the widely used structural steel S355J2 + N welded by the gas metal arc welding (GMAW) process. Rather than performing an arbitrary adjustment of CCT behavior, four justifiable data sets were used as input to the numerical calculation: data available in the Sysweld database, experimental data acquired through Gleeble dilatometry tests, and TTT/CCT predictions calculated from the JMatPro and Edison Welding Institute (EWI) Virtual Joining Portal software. The performed numerical analyses resulted in noticeable deviations in residual stresses considering the different CCT diagrams. Furthermore, possibilities to improve the prediction of distortions and residual stress based on CCT behavior are discussed. KW - Welding simulation KW - GMAW KW - CCT sensitivity KW - Welding residual stress PY - 2011 DO - https://doi.org/10.1007/s11706-011-0131-7 SN - 1673-7377 SN - 1673-7482 VL - 5 IS - 2 SP - 168 EP - 178 PB - Springer ; [Beijing] : Higher Education Press CY - Secaucus, N.J. ; Heidelberg AN - OPUS4-23835 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Schempp, Philipp A1 - Cross, Carl Edward A1 - Schwenk, Christopher A1 - Rethmeier, Michael T1 - Influence of Ti and B additions on grain size and weldability of aluminium alloy 6082 JF - Welding in the world N2 - Grain refinement is an important possibility to enhance the weldability of aluminium weld metal that is usually defined by its susceptibility to solidification cracking. In this study, grain refinement was achieved through the addition of commercial grain refiner containing titanium and boron to the GTA weld metal of aluminium alloy 6082. The weld metal mean grain size could be reduced significantly from about 70 µm to a saturated size of 21 µm with a change in grain shape from columnar to equiaxed. The grain refinement prevented the formation of centreline solidification cracking that was present only in welds with unrefined grain structure. A variation of torch speed led to a strong change of solidification parameters such as cooling rate that was measured in the weld metal and the corresponding solidification rate and thermal gradient. The ratio thermal gradient/growth rate (G/R) decreased from 50 K s/mm² (high torch speed) to 10 K s/mm² (low torch speed). However, the variation of torch speed did not change the tendency for solidification cracking. The microstructure of unrefined and completely refined weld metal was compared. The observed change in size and distribution of the interdendritic phases was related to the change in susceptibility to solidification cracking. KW - Aluminium KW - WIG-Schweißen KW - Kornfeinung KW - Schweißeignung KW - Heißrisse KW - Aluminium alloy KW - Solidification cracking KW - Weldability KW - GTA welding PY - 2012 SN - 0043-2288 SN - 1878-6669 VL - 56 IS - 09/10 SP - 95 EP - 104 PB - Springer CY - Oxford AN - OPUS4-26992 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Pittner, Andreas A1 - Schwenk, Christopher A1 - Rethmeier, Michael A1 - Weiß, D. T1 - Automated generation of temperature fields for numerical welding simulation JF - Quarterly journal of the Japan Welding Society KW - Welding simulation KW - Temperature field generation KW - Optimization KW - Neural networks PY - 2009 SN - 0288-4771 VL - 27 IS - 2 SP - 219 EP - 224 CY - Tokyo, Japan AN - OPUS4-19826 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Tikhomirov, D. A1 - Schwenk, Christopher T1 - Efficient numerical welding simulation through standardisation JF - Welding and cutting KW - Schweißen KW - Simulation KW - Normung PY - 2010 SN - 1612-3433 VL - 9 IS - 5 SP - 292 EP - 295 PB - DVS - German Welding Society CY - Düsseldorf AN - OPUS4-22038 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Tikhomirov, D. A1 - Schwenk, Christopher T1 - Effiziente numerische Schweißsimulation durch Standardisierung JF - Schweißen und Schneiden : Fachzeitschrift für Schweißen und verwandte Verfahren KW - Schweißen KW - Simulation KW - Normung PY - 2010 SN - 0036-7184 VL - 62 IS - 9 SP - 519 EP - 523 PB - Verl. für Schweißen u. Verwandte Verfahren, DVS-Verl. CY - Düsseldorf AN - OPUS4-22041 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Caron, J. A1 - Heinze, Christoph A1 - Schwenk, Christopher A1 - Rethmeier, Michael A1 - Babu, S. S. A1 - Lippold, J. T1 - Effect of continuous cooling transformation variations on numerical calculation of welding-induced residual stresses JF - Welding journal N2 - Continuous cooling transformation (CCT) behavior affects the transient state of material properties employed in a numerical welding simulation, having a direct influence on the developing stress state. Three different CCT diagrams for S355J2 steel were employed to understand the influence of variations in CCT behavior on the numerical calculation of welding-induced residual stresses. The CCT diagrams were constructed from transformation data contained in the Sysweld software database, measured dilatometric data from Gleeble experiments, and transformation data calculated from the JMatPro software. The calculated transverse and longitudinal residual stress distributions provided a qualitative correction only in comparison to experimental measurements, with the largest deviation occurring near the weld interface. Overall, the results indicate a weak dependency of the calculated residual stresses due to anticipated CCT variations. The most significant effect on the calculated residual stresses was shown to be related to the proportion of formed martensite. It is suggested that CCT data of approximate accuracy is sufficient for reliable calculation of welding-induced residual stresses. KW - Continuous cooling transformation diagrams KW - Residual stresses KW - Gas metal arc welding KW - C-Mn steels KW - Welding simulation KW - Schweißsimulation KW - Eigenspannungen KW - Martensitbildung KW - Sensitivitätsanalyse KW - Sysweld KW - Martensite kinetic KW - Sensitivity analysis PY - 2010 SN - 0043-2296 SN - 0096-7629 VL - 89 SP - 151-s - 160-s PB - American Welding Society CY - New York, NY AN - OPUS4-21444 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Schwenk, Christopher T1 - Normen und Richtlinien für die numerische Schweißsimulation - Entwicklungsbegleitende Normung (EBN) JF - DIN-Mitteilungen + Elektronorm N2 - Die Schweißsimulation ermöglicht frühzeitige Aussagen über schweißbedingte Phänomene und hilft so, den Entwicklungsprozess zu verbessern. Damit können die Ursachen auftretender Qualitätseinbußen besser identifiziert werden, sodass eine gezielte Vorgehensweise für die Bauteil- und Verfahrensoptimierung möglich wird. Das wirtschaftliche Anwendungspotenzial der Schweißsimulation ist enorm und mit dem der Umformsimulation vergleichbar. Bei unsachgemäßer Anwendung ist das Fehlerpotenzial jedoch sehr hoch, wodurch die Notwendigkeit einer strukturierten und definierten Vorgehensweise verdeutlicht wird. Hiermit werden nicht nur die Zuverlässigkeit und Aussagekraft der Simulationen sichergestellt, sondern auch eine Grundlage zur effektiven Vergleichbarkeit verschiedener Berechnungsprojekte geschaffen. Diese Sicherheit ist sowohl für Auftraggeber als auch für Auftragnehmer wichtig und hilft, die industrielle Anwendung der Schweißsimulation zu unterstützen und ihr Potenzial voll auszuschöpfen. PY - 2010 SN - 0722-2912 SN - 0011-4952 VL - 6 SP - 28 EP - 31 PB - Beuth CY - Berlin AN - OPUS4-21447 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schwenk, Christopher T1 - Fügetechnik am IPK und der BAM T2 - Kolloquium "Synergie von Werkstoff- und Prozesstechnik" T2 - Kolloquium "Synergie von Werkstoff- und Prozesstechnik" CY - Berlin, Germany DA - 2010-06-04 PY - 2010 AN - OPUS4-21469 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Tikhomirov, D. A1 - Schwenk, Christopher T1 - Efficient numerical welding simulation through standardisation JF - Welding research abroad PY - 2010 SN - 0043-2318 VL - LVI IS - 09 SP - 18 EP - 21 PB - Welding Research Council CY - New York, NY AN - OPUS4-23283 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Heinze, Christoph A1 - Schwenk, Christopher A1 - Rethmeier, Michael T1 - Influences of mesh density and transformation behavior on the result quality of numerical calculation of welding induced distortion JF - Simulation modelling practice and theory N2 - Welding simulation is a powerful, cost-efficient tool to predict welding induced distortion. Nevertheless, effects on calculation result quality are often unknown, thus, sensitivity analyses should be performed to evaluate the influences of certain parameters on distortion development. In the present paper, a single-layer gas metal arc (GMA) weld of 5 mm thick structural steel S355J2+N is experimentally and numerically investigated. Subsequent to welding, the numerical modeling begins with a mesh analysis based on modal analyses. Hereby, the influence of different coarsening methods and element edge length (EEL) in welding direction on the deformation behavior or the stiffness of the discrete geometry is the focus of the analysis. Secondly, phase transformations in structural steels such as S355J2+N are decisive for final product properties. The sensitivity of welding-induced distortion is examined regarding different continuous cooling transformation (CCT) diagrams for S355J2+N. The present investigations deal with different relevant influences on numerical calculation of welding-induced distortion. The quality and quantity of these effects are clarified based on the experimental and numerical set-up employed. Consequently, prediction of welding-induced distortion is possible and potential for pre-production optimization is present. KW - Welding simulation KW - Gas metal arc welding KW - Welding-induced distortion KW - Mesh analysis KW - CCT sensitivity PY - 2011 DO - https://doi.org/10.1016/j.simpat.2011.05.001 SN - 1569-190X VL - 19 IS - 9 SP - 1847 EP - 1859 PB - Elsevier CY - Amsterdam [u.a.] AN - OPUS4-23874 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Perret, William A1 - Alber, U. A1 - Schwenk, Christopher A1 - Rethmeier, Michael ED - Wieland, H.-J. T1 - Efficient welding simulation of an automotive sheet metal assembly T2 - SCT2011 - 3rd International conference on steels in cars and trucks - Future trends in steel development, processing technologies and applications N2 - Fusion welding is widely used in the automotive industry to join metal structures. It is well-known that distortions and residual stresses occur during and after the welding process. Many procedures exist to decrease these negative heat effects of welding, but are often coupled with highly cost intensive experiments. The implementation of a welding Simulation tool to reduce this very expensive experimental procedures is therefore of high interest. Despite the fact that the automotive industry is a key sector for Simulation procedures, welding Simulation Software is nevertheless not yet widely implemented. This is mainly due to the complexity of the Simulation tools requiring expert users and the resulting high time to Solution. In this study, a new fast thermo-mechanical Simulation of a complex and large laser beam welded automotive sheet metal assembly with several non linear welds is simulated. Assumptions and simplifications of the complex physical welding phenomenon, which are made to keep the computational cost and the complexity of the Simulation in an industrial frame, are discussed. The calibration time of the phenomenological heat source model has been optimized with a very fast analytical thermal model and the resulting simulated temperature fields match perfectly with the measured ones. Additionally, the user experience and the time-to-solution are kept within a reasonable time frame for arr industrial environment. All Simulation results are validated with experimental results. T2 - SCT2011 - 3rd International conference on steels in cars and trucks CY - Salzburg, Austria DA - 05.06.2011 KW - Welding simulation KW - Temperature field KW - Laser beam welding KW - Fast calculation PY - 2011 SN - 978-3-514-00783-3 SP - 704 EP - 713 PB - Stahleisen AN - OPUS4-24088 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Chen, Ji A1 - Schwenk, Christopher A1 - Wu, Chuan Song A1 - Rethmeier, Michael T1 - Prediction of weld pool shape and influence of joint preparation angle for new gas metal arc welding processes T2 - JOM-16 - 16th International conference on the joining of materials (Proceedings) N2 - This article studies the three dimensional transient weld pool dynamics and the influence of joint preparation angle on welding of low carbon structural steel plates using the ForceArc® process. ForceArc is a new gas metal arc welding technology which allows adequate fusion and penetration with a smaller V groove angle. This enhances welding efficiency significantly because of reduction of layers and low material consumption. The deformation of the weld bead is calculated with an accurate coupling of the heat transfer with fluid flow through continuity, momentum and the energy equations combined with the effect of droplet impingement, gravity, electromagnetic force, buoyancy, drag forces and surface tension force (Marangoni effect). Four different angles of V groove are employed with the same welding parameters and their influence on the weld pool behavior and weld bead geometry is calculated and analyzed, to allow subsequent calculations of residual stress and distortion of the workpiece. Such a simulation is an effective way to study welding processes because the influence of all the welding parameters can be analyzed separately with respect to thermal cycle, weld bead formation, and the microstructure of the weld. Good agreement is shown between the predicted and experimentally determined weld bead dimensions. It was found that with a larger groove angle, the penetration depth increases. Furthermore, a higher wire feeding rate is needed to fill the larger groove. The model presented can be used for further analyses of GMAW processes as well as input data for the numerical calculation of welding induced residual stresses and distortions using Computational Weld Mechanics CWM. T2 - JOM-16 - 16th International Conference on the Joining of Materials CY - Tisvildeleje, Denmark DA - 10.05.2011 KW - Numerical simulation KW - Gas metal arc welding KW - Weld pool shape KW - Fluid flow KW - V groove PY - 2011 SN - 87-89582-19-5 IS - JOM 7 / J15 SP - 1 EP - 13 AN - OPUS4-23984 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Karkhin, Victor A1 - Pittner, Andreas A1 - Schwenk, Christopher A1 - Rethmeier, Michael T1 - Simulation of inverse heat conduction problems in fusion welding with extended analytical heat source models JF - Frontiers of materials science N2 - The paper presents bounded volume heat sources and the corresponding functional-analytical expressions for the temperature field. The power density distributions considered here are normal, exponential and parabolic. The sources model real heat sources like the welding arc, laser beam, electron beam, etc., the convection in the weld pool as well as the latent heat due to fusion and solidification. The parameters of the heat source models are unknown a priori and have to be evaluated by solving an inverse heat conduction problem. The functional-analytical technique for calculating 3D temperature fields in butt welding is developed. The proposed technique makes it possible to reduce considerably the total time for data input and solution. It is demonstrated with an example of laser beam welding of steel plates. KW - Laser beam welding KW - Volume heat source KW - Functional-analytical solution KW - Inverse modelling PY - 2011 DO - https://doi.org/10.1007/s11706-011-0137-1 SN - 2095-025X SN - 2095-0268 VL - 5 IS - 2 SP - 119 EP - 125 PB - Springer CY - Secaucus, N.J. AN - OPUS4-24164 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Karkhin, Victor A1 - Pittner, Andreas A1 - Schwenk, Christopher A1 - Rethmeier, Michael ED - Halmoy, E. T1 - Simulation of the temperature field in laser beam welding by inverse technique T2 - 13th Conference on laser materials processing in the nordic countries N2 - This paper presents volume heat sources and the corresponding functional analytical Solutions for the transient temperature field. The considered energy distributions are normal, exponential and parabolic. The method follows the common approach in Computational Welding Mechanics (CWM) to account for the physics of the welding process and the resulting temperature field by phenomenological models for heat conduction. Therefore, the used heat source models are apparent heat sources that incorporate the real heat input as well as the fluid flow in the weld pool and the latent heat connected with phase transformations. The heat source models provide welding characteristics like thermal cycle and Fusion line in the cross section within short computational time. Consequently, inverse techniques on basis of optimisation algorithms enable the adaptation of the models to the experimental data efficiently. Furthermore, the direct evaluation of the energy distribution for the experimental fusion line in the cross section is demonstrated which enhances the numerical optimisation by reducing the number of unknown model Parameters and providing a reasonable initial guess within the model parameter space. The proposed temperature field models are validated with real laser beam welding experiments. T2 - 13th Conference on laser materials processing in the nordic countries CY - Trondheim, Norway DA - 27.06.2011 KW - Volume heat source KW - Inverse modelling KW - Functional analysis KW - Laser beam welding PY - 2011 SP - 223 EP - 234 AN - OPUS4-24165 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Rethmeier, Michael A1 - Schwenk, Christopher A1 - Heinze, Christoph T1 - Optimierung von Verzug und Eigenspannungen beim Schweißen dickwandiger Bauteile T2 - Forschung für die Praxis P 784 N2 - Die Schweißsimulation dickwandiger Bauteile stellt aufgrund der erhöhten Komplexität der thermophysikalischen und thermomechanischen Vorgänge beim Mehrlagenschweißen hohe Anforderungen an kommerziell verfügbare Schweißsimulationssoftware. Das umfasst die während des Fügeprozesses induzierten Verzüge und Eigenspannungen in das gefertigte Bauteil, welche zur Beurteilung der Fertigungsqualität von großer Bedeutung sind. Gerade in dickwandigen Bauteilen ist der Spannungszustand sowohl bedingt durch die konstruktive Steifigkeit der einzelnen Bauteile sowie der gesamten Baugruppe als auch aufgrund zusätzlicher externer Einspannvorrichtungen bei der Fertigung überaus komplex. Hinzu kommen bei Werkstoffen mit Phasenumwandlung noch die metallurgisch verursachten Spannungszustände und bei mehrlagig ausgeführten Schweißverbindungen die wiederholte thermische und umwandlungsbedingte Spannungsausbildung, so dass eine überschlägige Abschätzung des gesamten Verformungs- und Spannungszustandes auch für Experten in der Regel nicht mehr möglich ist. Die vorherrschenden Verformungen und Spannungen bestimmen jedoch maßgeblich die Eigenbeanspruchung der Schweißkonstruktion und damit deren Belastbarkeit im Betrieb. Eine genaue Kenntnis dieser Daten würde wertvolle Informationen zur Qualitätsoptimierung des Endproduktes liefern. KW - Schweißsimulation KW - Eigenspannungen KW - Verzug KW - Validierung KW - Sysweld KW - Mehrlagenschweißen PY - 2011 SN - 3-937567-98-4 SP - 1 EP - 160 PB - Verlag und Vertriebsgesellschaft mbH CY - Düsseldorf AN - OPUS4-23350 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Heinze, Christoph A1 - Kromm, Arne A1 - Schwenk, Christopher A1 - Kannengießer, Thomas A1 - Rethmeier, Michael T1 - Welding residual stresses depending on solid-state transformation behaviour studied by numerical and experimental methods JF - Materials science forum N2 - The development of high-strength structural steels with yield strengths up to 1000 MPa results in the requirement of suitable filler materials for welding. Recently designed low transformation temperature (LTT) alloys offer appropriate strength. The martensitic phase transformation during welding induces compressive residual stress in the weld zone. Therefore, the mechanical properties of welded joints can be improved. The present paper illustrates numerical simulation of the residual stresses in LTT-welds taking into account the effect of varying Ms/Mf-temperatures, and therefore different retained austenite contents, on the residual stresses. Residual stress distributions measured by synchrotron diffraction are taken as evaluation basis. A numerical model for the simulation of transformation affected welds is established and can be used for identification of appropriate Ms-temperatures considering the content of retained austenite. KW - Welding simulation KW - Residual stress KW - Low transformation temperature filler material KW - Martensitic transformation KW - Retained austenite PY - 2011 DO - https://doi.org/10.4028/www.scientific.net/MSF.681.85 SN - 0255-5476 VL - 681 SP - 85 EP - 90 PB - Trans Tech Publications CY - Aedermannsdorf, Switzerland AN - OPUS4-23357 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Karkhin, V.A. A1 - Pittner, Andreas A1 - Schwenk, Christopher A1 - Rethmeier, Michael ED - Makhnenko, V.I. T1 - Heat source models in simulation of heat flow in fusion welding T2 - 5th International Conference - Mathematical modelling and information technologies in welding and related processes (Proceedings) T2 - 5th International Conference - Mathematical modelling and information technologies in welding and related processes CY - vil. Katsiveli, Crimea, Ukraine DA - 2010-05-25 PY - 2010 SN - 978-966-8872-15-0 SP - 56 EP - 60 CY - Kiev, Ukraine AN - OPUS4-23382 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schwenk, Christopher A1 - Perret, William A1 - Thater, Raphael A1 - Heinze, Christoph T1 - Schweißsimulation an der BAM und am IPK T2 - Veranstaltung für Industrievertreter der Fa. ZF Friedrichshafen, Präsentation von aktuellen Projekten und Forschungsergebnissen T2 - Veranstaltung für Industrievertreter der Fa. ZF Friedrichshafen, Präsentation von aktuellen Projekten und Forschungsergebnissen CY - Friedrichshafen, Germany DA - 2011-02-22 PY - 2011 AN - OPUS4-23324 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Schwenk, Christopher A1 - Tikhomirov, D. A1 - Diether, T. T1 - Erste Spezifikation für die numerische Schweißsimulation - Normenausschuss Schweißtechnik (NAS) im DIN - DIN SPEC 32534-1:2011-03 "Numerische Schweißsimulation - Durchführung und Dokumentation - Teil 1: Übersicht" JF - DIN-Mitteilungen + Elektronorm N2 - Mit Ausgabedatum März 2011 ist die Spezifikation DIN SPEC 32534-1 erschienen. Die Spezifikation wurde im DIN/DVS-Gemeinschaftsausschuss NA 092-00-29 AA „Schweißsimulation (DVS AG I 2.1)" des Normenausschusses Schweißtechnik (NAS) im DIN in Zusammenarbeit mit dem Ausschuss für Technik (AfT) im DVS - Deutscher Verband für Schweißen und verwandte Verfahren e. V. nach dem Vornormverfahren erarbeitet. PY - 2011 SN - 0722-2912 SN - 0011-4952 VL - 5 SP - 129 EP - 130 PB - Beuth CY - Berlin AN - OPUS4-23673 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Thater, R. A1 - Perret, William A1 - Schwenk, Christopher A1 - Alber, U. A1 - Rethmeier, Michael ED - Vollertsen, F. T1 - Different modeling approaches for efficient distortion calculation of an automotive assembly T2 - International workshop on thermal forming and welding distortion - IWOTE' 11 (Proceedings) N2 - In contrast to other simulation fields like forming simulation, welding simulation is still not widely used in industrial environments. A high user expertise, a high time-to-solution and the result accuracy are the most important problems that hinder its extensively application. Different modeling approaches influence these aspects and an analysis of their implementation is of interest especially for the automotive industry as a key user for production Simulation. T2 - International workshop on thermal forming and welding distortion - IWOTE´ 11 CY - Bremen, Germany DA - 06.04.2011 KW - Welding distortions KW - Automotive assembly KW - Modeling approach KW - Time-to-solution PY - 2011 SN - 978-3-933762-35-1 SP - 279 EP - 291 CY - Bremen AN - OPUS4-23627 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Pittner, Andreas A1 - Schwenk, Christopher A1 - Rethmeier, Michael A1 - Weiß, D. ED - Hirata, Yoshinori ED - Manabu Tanaka, T1 - Automated generation of temperature fields for numerical welding simulation T2 - Proceedings of the 8th International Welding Symposium - Innovations in Welding and Joining for a New Era in Manufacturing T2 - 8th International Welding Symposium - Innovations in Welding and Joining for a New Era in Manufacturing CY - Kyoto, Japan DA - 2008-11-16 KW - Welding simulation KW - Temperature Field Generation KW - Optimization KW - Neural Networks PY - 2008 SP - 158 PB - Japan Welding Society CY - Kyoto AN - OPUS4-18614 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schwenk, Christopher T1 - Eintwurf einer Richtlinie zur strukturierten Vorgehensweise bei der Durchführung, Auswertung und Ergebnisdarstellung einer numerischen Simulation schweißbedingter Verzüge und Eigenspannungen T2 - Sitzung des NAS-Beirates T2 - Sitzung des NAS-Beirates CY - Berlin, Germany DA - 2009-03-02 PY - 2009 AN - OPUS4-19085 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Caron, J. A1 - Heinze, Christoph A1 - Schwenk, Christopher A1 - Rethmeier, Michael A1 - Babu, S. S. A1 - Lippold, J. ED - Cerjak, H. ED - Enzinger, N. T1 - Sensitivity analysis of martensite transformation temperatures with respect to numerical calculation of welding-induced residual stresses T2 - Mathematical modelling of weld phenomena 9 KW - Schweißsimulation KW - Eigenspannungen KW - Martensitbildung KW - Sensivitätsanalyse KW - Sysweld KW - Welding simulation KW - Residual stresses KW - Martensite kinetic KW - Sensitivity analysis PY - 2010 SN - 978-3-85125-127-2 SP - 215 EP - 238 PB - Verlag der Technischen Universität Graz AN - OPUS4-23008 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Schwenk, Christopher A1 - Perret, William T1 - Abschlussbericht zur Übersicht aktueller Software im Bereich Schweißsimulation N2 - Das Ziel der vorliegenden Vorstudie ist es, die grundsätzlichen Anforderungen, Funktionen und Möglichkeiten vorhandener Software zur Simulation schweißbedingter Phänomene (Prozess-, Struktur- und Werkstoffsimulation) zu erarbeiten und gegenüberzustellen. Die notwendigen Eingabedaten, die vorausgesetzte Anwendererfahrung, sowie die Systemanforderungen und der Rechenzeitbedarf werden für sowohl kommerziell erhältliche als auch zur Zeit noch rein in der Forschung angewandte Programme berücksichtigt. Nach Aufarbeitung des heutigen Kenntnisstandes der Schweißsimulation wird aktuell verfügbare Software diskutiert. Diese Programme lassen sich in Anlehnung an Radaj in drei Teilbereiche (Software für Struktursimulation, Prozesssimulation und Werkstoffsimulation) unterteilen. Schließlich wird auf notwendige Eingabedaten, hier vor Allem auf die Werkstoffkennwerte, eingegangen. Da die quantitative Aussagekraft der Simulationsergebnisse gewährleistet werden muss, ist eine umfassende Prüfung der Plausibilität und der Genauigkeit der experimentell bestimmten Werkstoffkennwerte notwendig. KW - Schweißbedingte Phänomene KW - Simulation KW - Software PY - 2009 N1 - Die vorliegende Vorstudie wurde von der Volkswagen AG Konzernforschung finanziert. SP - 1 EP - 64 PB - Bundesanstalt für Materialforschung und -prüfung (BAM) CY - Berlin AN - OPUS4-59606 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -