Thermomechanical analysis of residual stresses in Satoh test specimen using PATRAN/ABAQUS

The Satoh test equipment has been developed for evaluation of thermalstresses during welding. The method is based on induction heating of a round specimen in a rigid frame devicewhere both the temperature-time pattern and the resulting thermal stresses can be monitored by means of thermocouples and a load cell, respectively. This report descri bes an uncoupled analysis of the Satoh test using the PATRAN/ABAQUS finite element code. The temperature was calculatedby thermal analysis and used as input to the stress analysis. In the stress analysis, temperature varies with position and time. In this case study, uniform thermal properties were assumed. Attempts were also made to acc ount for the temperatur e dependence of the mechanicalproperties. For the material and welding conditions considered, a fairly good agreement was obtained between experimentallymeasured and calculatedthermal cycles and str esses, even if the thermal expansion during the g to a transformation was neglected. Omitting the transformation processes that take place at elevated temperature and consequently at low yield stress only results in a smal error forthis steel under the conditions examined. In the general case, however, transf ormation-induced stre sses must be accounted for in themechanical model, and some further refinementsare therefore required.