Materials Reports  2021, Vol. 35 Issue (Z1): 362-366 |
| METALS AND METAL MATRIX COMPOSITES |
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| 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
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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 |
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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.
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Published: 16 July 2021
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| Fund:Natural Science Foundation of China (51475362, 51811530311). |
| About author:: He Xue, professor, doctoral supervisor, Xi'an University of Science and Technology, graduated from Xi'an Jiaotong University in Materials and Scientific Enginee-ring in November 1998, with a doctorate in engineering. He is mainly engaged in the safety assessment of important mechanical structures, the safety and reliability assessment and application research of key nuclear wel-ding joints. More than 120 articles have been published in important journals at home and abroad, and more than 20 invention patents have been declared.Ji Liu, Xi'an University of Science and Technology, graduate student, focusing on the research of computer aided engineering and the safety and reliability assessment and application research of key nuclear welding joints. |
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