摘要
利用有限元方法对HR3C/T91接头在温度为600℃、内压为42.26 MPa作用下的最大蠕变主应力、von Mises等效应力和应力三轴度进行数值分析,并采用温度—应力双参数加速试验对模拟结果进行验证.结果表明,最大主应力峰值位于管接头内表面焊缝/T91界面附近区域,von Mises等效应力峰值同样位于内表面焊缝/T91界面附近区域,因而焊缝/T91界面区域内孔洞易于形核、扩张.内表面应力三轴度峰值分别位于HR3C/焊缝和焊缝/T91界面处,与两界面重合.内表面焊缝/T91界面处的应力三轴度数值较大,而焊缝/T91界面的蠕变强度较HR3C/焊缝弱,因此焊缝/T91界面为接头的薄弱环节,与加速试验结果一致.
The maximum principal stress,von Mises equivalent stress,stress triaxiality in dissimilar welded joints between austenitic( HR3C) and martensitic heat-resistant steel( T91) are simulated by FEM under the conditions of 600 ℃ and inner pressure of 42. 26 MPa. The results show that the maximum principal stress and von Mises equivalent stress are quit high in the vicinity of weld/T91 interface,creep cavities are easy to form and expand in the weld/T91 interface. Weld/T91 interface is the weakest part of welded joint. The stress triaxiality peak is located exactly at the weld/T91 interface,and quit high.Therefore,using stress triaxiality to describing creep cavity nucleation and expansion and crack development is reasonable for the dissimilar welded joint between austenitic and martensitic steel.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2017年第10期11-15,共5页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51374154)
关键词
异种钢接头
有限元
最大主应力
等效应力
应力三轴度
dissimilar metal welded joint
FEM
maximum principal stress
equivalent stress
stress triaxiality
