J. Phys. IV France 120 (2004) 169-175
Numerical simulation of welding stresses and distortions under consideration of temporal and local changes of strain rateR. 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
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.
© EDP Sciences 2004