Numéro
J. Phys. IV France
Volume 120, December 2004
Page(s) 169 - 175
DOI http://dx.doi.org/10.1051/jp4:2004120019


J. Phys. IV France 120 (2004) 169-175

DOI: 10.1051/jp4:2004120019

Numerical simulation of welding stresses and distortions under consideration of temporal and local changes of strain rate

R. Ossenbrink1, H. Wohlfahrt2 and V. Michailov1

1  Fraunhofer-Institute for Mechanics of Materials IWM, Wöhlerstr. 11, 79108 Freiburg, Germany
2  Welding Institute, Technical University of Braunschweig, Langer Kamp 8, 38106 Braunschweig, Germany


Abstract
As a result of high temperature changing rates in the heat affected zone (HAZ) the elevated strain rates during welding may have a high influence of the yield stresses. Higher yield stresses as a result of high strain rates can be observed in hot tensile tests for several materials. A model has been developed and integrated in a multi-purpose FEA-program (ANSYS®) to investigate strain rate effects in numerical welding simulation. The routine calculates the current yield stress as a function of the local strain rates. The influence of the resulting stresses and distortions has been analyzed in comparative numerical welding simulations.



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