东南大学学报（英文版）2021，Vol.37Issue(1)：59-66,8.DOI:10.3969/j.issn.1003-7985.2021.01.008
基于外推缺口应力法的铸钢节点环形对接焊缝的疲劳寿命评估
Fatigue life evaluation of girth butt weld within welded cast steel joints based on the extrapolation notch stress method
摘要
Abstract
The fatigue life evaluation of the girth butt weld within the welded cast steel joint was studied based on the extrapolation notch stress method.Firstly,the mesh sensitivity of the finite element model of the welded cast steel joint was analyzed to determine the optimal mesh size.Based on the stress field analysis of the finite element model of the welded cast steel joint at the weld toe and weld root,the sharp model of the extrapolation notch stress method was applied to derive the effective notch stress of the rounded model belonging to the effective notch stress method,in which the key problem is to calculate the extrapolation point C,and the extrapolation point C has an exponential function relationship with the geometric parameters of the welded cast steel joint.By setting different values of geometric parameters,the corresponding value of parameter C is calculated,and then the functional relationship between the extrapolation point C and the geometric parameters can be obtained by the multiple linear regression analysis.Meanwhile,the fatigue life evaluation of the girth butt weld within welded cast steel joints based on the effective notch stress was performed according to the guideline recommended by the ⅡW(International Institute of Welding).The results indicate that the extrapolation notch stress method can effectively simplify the process of calculating the effective notch stress and accurately evaluate the fatigue life of the girth butt weld within welded cast steel joints.关键词
铸钢节点/环形对接焊缝/外推缺口应力法/有效缺口应力法/疲劳设计寿命评估Key words
welded cast steel joint/girth butt weld/extrapolation notch stress method/effective notch stress method/fatigue life evaluation分类
建筑与水利引用本文复制引用
卫泽众,金传领,靳慧..基于外推缺口应力法的铸钢节点环形对接焊缝的疲劳寿命评估[J].东南大学学报（英文版）,2021,37(1):59-66,8.基金项目
The National Key Research and Development Program of China(No.2017YFC0805100),the National Natural Science Founda-tion of China(No.51578137),the Priority Academic Program Develop-ment of Jiangsu Higher Education Institutions,the Open Research Fund Program of Jiangsu Key Laboratory of Engineering Mechanics. （No.2017YFC0805100）
