Experimental Investigation on Thermal Recovery Behavior of Internal Stress

The thermal recovery of internal stress becomes important in inelastic deformation at elevated temperatures such as creep or creep-plasticity interaction. In this paper the thermal recovery behavior of the internal stress is investigated by analyzing experimental stress-strain responses of JIS SCMV 4 steel at 550°C. The “bowing-out” behavior observed at the commencement of unloading in the cyclic stress-strain diagram is precisely investigated from which the recovery behavior of internal stress is obtained. Based on the obtained results, a thermal recovery term of evolution equation of internal stress is calibrated. Numerical simulation shows good agreement with the experimental data.