摘要
应用大型有限元分析软件ABAQUS及其RESTART功能,建立了焊接温度场模型、残余应力场模型和蠕变分析模型。使用焊接残余应力作用下蠕变的顺次耦合有限元计算方法,对Cr5Mo加热炉炉管焊接接头残余应力和蠕变进行了数值模拟。计算方法为掌握复杂的焊接残余应力对高温炉管焊接接头的蠕变影响奠定了基础。比较了考虑焊接残余应力和仅承受内压两种工况下的炉管接头蠕变情况。结果表明,虽然焊接残余应力在短时间内松弛,但焊接残余应力决定了炉管的蠕变变形,焊接残余应力是影响炉管蠕变的重要因素。
By the finite element analysis codes ABAQUS and the function of RESTART, a sequential coupling calculating program for creep based on welding residual stress has been developed by establishing the model of temperature field, residual field and creep analysis. The welding residual stress and creep of welded joint for Cr5Mo furnace tubes was simulated by this program. This method established the basis for calculating the effects of welding residual stress on the creep of welded joint. A creep comparison between the welded joint tubes with welding residual stress and with internal pressure was made. The results showed that the tube creep was decided by the welding residual stress, although the welding residual stress was relaxed in a short time.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2007年第8期99-102,107,共5页
Transactions of The China Welding Institution
关键词
CrSMo炉管
焊接接头
焊接残余应力
应力松弛
蠕变
Cr5Mo furnace tubes
welded joint
welding residual stress
stress relaxation
creep
numerical simulation
