| Abstract: | A coupling calculation method for welding residual and creep damage has been developed by ABAQUS finite element code and its user subroutine UMAT. According to this method, the effect of welding residual stress for Cr5Mo steel welded joint on creep damage was simulated at high temperature. At the same time the creep damage without welding residual stress was compared with that under the consideration of welding residual stress. The research results show that the maximum residual stress all concentrate in weld metal (WM) and heat-affected zone (HAZ). And the axial and hoop stress is higher than radial stress. At high temperature, although the welding residual stress is much higher at initial stage and the residual stress is relaxed in a short time, the welded joint creep damage is greatly influenced by the residual stress. The distribution of creep damage is same as the distribution of welding residual stress. The presented work provides the probability for the high temperature strength design and life assessment of high temperature component. |
