建筑钢结构进展2025，Vol.27Issue(12)：62-69,8.DOI:10.13969/j.jzgjgjz.20240703001
Q355B钢对接接头气孔缺陷对疲劳寿命影响的试验研究与数值模拟
Experimental Study and Numerical Simulation of the Effect of Porosity Defects on Fatigue Life of Q355B Steel Butt Joints
熊海江 1赵东拂 2刘育民 3郝佩远 1张菊1
作者信息
- 1. 北京建筑大学 土木与交通工程学院,北京 100044
- 2. 北京建筑大学 土木与交通工程学院,北京 100044||北京建筑大学 大型多功能振动台阵实验室,北京 100044||北京建筑大学 工程结构与新材料北京市高等学校工程研究中心,北京 100044||北京建筑大学 北京节能减排与城乡可持续发展省部共建协同创新中心,北京 100044||北京建筑大学 北京未来城市设计高精尖创新中心,北京 100044
- 3. 中电投工程研究检测评定中心有限公司,北京 100142
- 折叠
摘要
Abstract
The welding process is often accompanied by the generation of defects such as porosity,slag inclusion,undercut,which can easily lead to the generation and expansion of fatigue cracks under fatigue loading.Using finite element software ABAQUS combined with fracture mechanics analysis software FRANC3D,a finite element model of the butt weld joint with porosity defects was established,and a crack was introduced at the location of maximum stress concentration.The numerical simulation of the cracked model was carried out based on the M-integral of fracture mechanics,and the stress intensity factors at the crack tip were obtained under different initial crack lengths and weld widths.The analysis results show that the stress intensity factor at the crack tip is sensitive to the change of the initial crack length and increases with the increase of the length,while the stress intensity factor at the two ends of the crack shows the opposite trend.The increase of the weld width can significantly reduce the stress intensity factor,and this trend gradually slows down with the increase of the weld width.On this basis,the fatigue life prediction model of butt joints with porosity defects was established by using the fracture mechanics Paris formula.The accuracy of the model was verified through the test,and the results showed that,except for some specimens,the error between the predicted and test results was less than 20%.The fatigue life of the butt joints with porosity defects could be predicted accurately.关键词
对接接头/气孔缺陷/疲劳寿命/FRANC3D/断裂力学/初始裂纹长度/应力强度因子Key words
butt joint/porosity defect/fatigue life/FRANC3D/fracture mechanics/initial crack length/stress intensity factor分类
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熊海江,赵东拂,刘育民,郝佩远,张菊..Q355B钢对接接头气孔缺陷对疲劳寿命影响的试验研究与数值模拟[J].建筑钢结构进展,2025,27(12):62-69,8.
