In order to predict residual stress in castings, elasto-plastic models are used in thermal stress analysis, however conventional elasto-plastic models cannot express the recovery of the casting during cooling.
In this study, thermal stress analysis of JIS ADC12 alloy castings was conducted using an original elasto-plastic-creep model developed by the authors, and the calculation results were validated with the experimentally obtained thermal stress. The model takes the recovery into account, which is a characteristic behavior of alloys at high temperatures. For the validation, an original device was also developed to measure the thermal stress in JIS ADC12 alloy cast specimens during cooling. The simulated thermal stress was continuously compared with the measured thermal stress. As a result, it was found that compared to the elasto-plastic model, the developed elasto-plastic-creep model is able to more accurately predict not only the thermal stress during cooling but also the residual stress.
