摘要
焊接残余应力是引发核电一回路安全端异种金属焊接接头应力腐蚀开裂的主要原因。借助ABAQUS软件中的扩展有限元方法(XFEM),利用预定义温度场加载法建立了残余应力场下异种金属焊接接头模型,基于最大主应力判定准则实现了材料的裂纹扩展模拟,初步探究了残余应力场下不同初始长度、不同位置裂纹的扩展规律。结果表明,在残余应力场下,裂纹扩展过程中扩展路径总是偏向于材料屈服极限较小的一侧,初始裂纹长度越短,其扩展能力越强;裂纹处材料区屈服极限越小,裂纹扩展能力越强,且材料交界处裂纹的扩展能力总是大于两侧材料区内部裂纹的扩展能力。
The welding residual stress is the main factor that leads to the stress corrosion cracking （SCC） of safe-end dissimilar metal welded joints in nuclear power plant primary circuit. By using the extended finite element （XFEM） method in ABAQUS software, the models of dissimilar metal welded joints under residual stress field were built using the predefme temperature field method, and the simulation of crack propagation was realized based on the maximum principal stress criterion. The crack propagation laws with different initial crack lengths and different locations were preliminarily studied under residual stress field. The results show that the crack propagation direction is always towards the material with smaller yield limit under the residual stress field, and the shorter the initial crack length is, the stronger the crack propagation ability is. The smaller the yield limit of the material with crack is, the stronger the crack propagation ability is. The crack propagation ability at the interface of two materials is stronger than that inside the materials at the two sides.
出处
《热加工工艺》
CSCD
北大核心
2017年第23期162-166,共5页
Hot Working Technology
基金
国家自然科学基金资助项目(51475362
11502195)
西安科技大学博士启动基金资助项目(2015QDJ025)
