基于大型有限元软件Abaqus及其用户子程序(Umat)功能, 开发了焊接残余应力与蠕变损伤耦合计算程序, 对高温用焊接接头残余应力作用下的蠕变损伤行为进行有限元模拟, 并与无焊接残余应力状态下的蠕变损伤情况 进行比较. 研究结果表明, 在炉管焊接状态下, 焊接残余应力最大值集中在焊缝和热影响区处, 并且轴向与环向 残余应力较高. 在高温环境下, 焊接接头初始态焊接残余应力较高, 虽然在短时间内应力松弛到较低的水平, 但 其蠕变损伤仍较大程度地受焊接残余应力的影响, 蠕变损伤分布与焊接残余应力的分布基本一致.
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.
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