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材料导报  2021, Vol. 35 Issue (Z1): 362-366    
  金属与金属基复合材料 |
基于UMAT焊接接头力学性能连续变化的表征方法及应用
薛河1, 刘吉1, 张顺1, 张建龙1,2, 孙裕满1, 毕跃起1
1 西安科技大学机械工程学院,西安 710054
2 西安特种设备检测检验院,西安 710065
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
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摘要 焊接接头的力学性能是影响其安全性评价的重要因素。为了能够在数值分析中准确地表征焊接接头力学性能不均匀分布规律,本工作利用有限元软件中的用户定义材料子程序(UMAT)建立了材料力学性能参数随空间坐标连续变化的焊接接头材料力学性能表征方法,解决了“三明治”焊接接头有限元模型分析中存在的材料力学性能突变问题。以高组配焊接接头为例,分析比较了含裂纹缺陷的“三明治”与连续过渡焊接接头有限元模型裂尖应力应变场分布的规律与特点。结果表明,连续过渡焊接接头有限元模型能够更为准确地表征材料力学性能不均匀分布规律,为焊接接头的力学性能分析与安全性评价提供了新的数值分析思路和方法。
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薛河
刘吉
张顺
张建龙
孙裕满
毕跃起
关键词:  焊接接头  用户定义材料子程序(UMAT)  力学性能不均匀性  数值模拟    
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.
Key words:  welded joint    User-defined Material Mechanical Behavior (UMAT)    non-uniformity of mechanical properties    numerical simulation
                    发布日期:  2021-07-16
ZTFLH:  TG407  
基金资助: 国家自然科学基金(51475362; 51811530311)
通讯作者:  xuehe@xust.edu.cn   
作者简介:  薛河,教授,博士研究生导师,西安科技大学。1998年11月毕业于西安交通大学材料与科学工程,获工学博士学位。主要从事重要机械结构安全性评价,核电焊接接头安全性及可靠性评定以及应用研究。在国内外重要期刊发表文章120多篇,申报发明专利20余项。刘吉,西安科技大学,硕士研究生。主要从事计算机辅助工程分析、核电焊接接头安全性及可靠性评定的研究。
引用本文:    
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.
链接本文:  
http://www.mater-rep.com/CN/  或          http://www.mater-rep.com/CN/Y2021/V35/IZ1/362
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