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屈服强度分布焊接接头对裂纹扩展路径及裂纹力学尖端场的影响

Effect of Yield Strength Distribution Welded Joint on Crack Propagation Path and Crack Mechanical Tip Field.

作者信息

Bi Yueqi, Yuan Xiaoming, Lv Jishuang, Bashir Rehmat, Wang Shuai, Xue He

机构信息

National Engineering Laboratory for Coal Mining Machinery and Equipment, Taiyuan Research Institute of China Coal Science and Engineering Group Co., Ltd., Taiyuan 030000, China.

Taiyuan Research Institute of China Coal Science and Engineering Group Co., Ltd., Taiyuan 030000, China.

出版信息

Materials (Basel). 2021 Aug 30;14(17):4947. doi: 10.3390/ma14174947.

DOI:10.3390/ma14174947
PMID:34501037
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8434217/
Abstract

Due to the particularity of welding processes, the mechanical properties of welded joint materials, especially the yield strength, are unevenly distributed, and there are also a large number of micro cracks, which seriously affects the safety performance of welded joints. In this study, to analyze the effect of the uneven distribution of yield strength on the crack propagation path of welded joints, other mechanical properties and residual stresses of welded joints are ignored. In the ABAQUS 6.14 finite element software, the user-defined field (USDFLD) subroutine is used to define the unevenly distributed yield strength, and extended finite element (XFEM) is used to simulate crack propagation. In addition, the static crack finite element model of the welded joint model is established according to the crack propagation path, which is given the static crack model constant stress intensity factor load, and the influence of an uneven yield strength distribution on mechanical field is analyzed. The results show that the crack length of welded joints as well as the plastic deformation range of the crack tip in high stress areas can be reduced with the increase of yield strength along the crack propagation direction. Moreover, the crack deflects to the low yield strength side. This study provides an analytical reference for the crack path prediction of welded joints.

摘要

由于焊接工艺的特殊性，焊接接头材料的力学性能，尤其是屈服强度，分布不均匀，且存在大量微裂纹，严重影响焊接接头的安全性能。在本研究中，为分析屈服强度不均匀分布对焊接接头裂纹扩展路径的影响，忽略了焊接接头的其他力学性能和残余应力。在ABAQUS 6.14有限元软件中，使用用户定义场（USDFLD）子程序定义不均匀分布的屈服强度，并采用扩展有限元（XFEM）模拟裂纹扩展。此外，根据裂纹扩展路径建立焊接接头模型的静态裂纹有限元模型，对其施加静态裂纹模型的常应力强度因子载荷，分析屈服强度分布不均匀对力学场的影响。结果表明，随着沿裂纹扩展方向屈服强度的增加，焊接接头的裂纹长度以及高应力区域裂纹尖端的塑性变形范围会减小。而且，裂纹会向低屈服强度一侧偏转。本研究为焊接接头裂纹路径预测提供了分析参考。

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