基于等承载理论的低匹配接头焊接残余应力三维有限元模拟

NUMERICAL SIMULATION OF RESIDUAL STRESS IN UNDER-MATCHED WELDED JOINT BASED ON EQUAL-LOAD THEORY BY 3D FEM

利用有限元法,采用生死单元技术对CF62焊接接头进行等匹配多道焊焊接模拟,并与316L不锈钢进行低匹配多道焊焊接模拟。设计基于等承载理论的低匹配焊接接头,建立低匹配多道焊焊接接头普通对称X型焊缝焊接接头和基于等承载理论设计的低匹配焊接接头模型。结果表明低匹配焊接接头相较等匹配焊接接头能降低残余应力。基于等承载理论设计的低匹配焊接接头残余应力较低匹配普通焊接接头更小,并能提升焊接接头后期使用的承载性能,更具优越性。

Simulate and analyze the multi-pass welds in under-matched welded joint between CF62 and 316L stainless steel with element birth and death technology by 3D finite element method. Design the under-matched welded joint based on equal-load theory. Found the multi-pass welds in under-matched welded joint whose shape is normal symmetrical X and the under-matched joint based on equal-load theory. The results show that the under-matched welded joint can reduce the residual stress compared with the normal well-matched welded joint. The under-matched joint based on equal-load theory has a smaller residual stress than the normal under-matched welded joint does so that it can improve the load capacity when it is used so the under-matched welded joint based on equal-load is more advantageous.