Characterization Method and Application of Continuous Variation of Welded Joint Mechanical Properties Based on UMAT
XUE He1, LIU Ji1, ZHANG Shun1, ZHANG Jianlong1,2, SUN Yuman1, BI Yueqi1
1 School of Mechanical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China 2 Xi'an Special Equipment Inspection Institute, Xi'an 710065, China
Abstract: The mechanical properties of welded joint are important factors affecting its safety evaluation. In order to accurately describe the non-uniform distribution of mechanical properties of welded joint in numerical analysis, the User-defined Material Mechanical Behavior(UMAT) in finite element software was used to establish a method to characterize the mechanical properties of welded joint with their mechanical properties changing continuously with spatial coordinates in this paper. The problem of sudden change of material mechanical properties in finite element analysis of sandwich welding joint was solved. Taking the welded joint with high mismatching coefficient as an example, the distribution of stress and strain field of crack tip of sandwich and continuous transition welded joint finite element model with crack defect were compared and analyzed. The results show that the continuous transition welded joint finite element model can more accurately characterize the non-uniform distribution of mecha-nical properties of materials. It provides a new method of numerical analysis for mechanical property analysis and safety evaluation of welded joint.
薛河, 刘吉, 张顺, 张建龙, 孙裕满, 毕跃起. 基于UMAT焊接接头力学性能连续变化的表征方法及应用[J]. 材料导报, 2021, 35(Z1): 362-366.
XUE He, LIU Ji, ZHANG Shun, ZHANG Jianlong, SUN Yuman, BI Yueqi. Characterization Method and Application of Continuous Variation of Welded Joint Mechanical Properties Based on UMAT. Materials Reports, 2021, 35(Z1): 362-366.