WSEAS Transactions on Applied and Theoretical Mechanics
Print ISSN: 1991-8747, E-ISSN: 2224-3429
Volume 8, 2013
Determination of Parameters of EVP Material Model in Numerical Welding Simulations
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Abstract: Numerical simulations are used more and more frequently in technological processes, including welding processes. They are used especially for the selection of the right welding procedure, prediction and analysis of resulting deformations and distortions and also for the resulting structure of the weld metal. Size and placement determination of the residual inner stresses in the material after welding are equally important, mainly in reference to the capacity and stability of the welded structures and the prediction of their behavior during different types of load. The submission deals with determination of parameters of EVP (elastic viscoplastic) material model, by help of these parameters it is possible to describe more precisely the residual stresses during and after the welding process. In comparison with commonly used constitutive models, the advantage of this model is that it also covers viscoplastic processes, which in reality take place by stress relaxation at high temperatures.
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Keywords: EVP material model, numerical simulations, viscoplastic processes, relaxation, Sysweld program