文献类型：期刊文献

中文题名：考虑残余应力的焊接节点疲劳寿命有限元分析

英文题名：Finite element analysis of fatigue life of welded joint considering residual stress

作者：何余良[1];钱昕[1];叶肖伟[2];张治成[2]

机构：[1]绍兴文理学院土木工程学院,浙江绍兴312000;[2]浙江大学建筑工程学院,杭州310058

年份：2022

卷号：44

期号：3

起止页码：54

中文期刊名：土木与环境工程学报（中英文）

外文期刊名：Journal of Civil and Environmental Engineering

收录：CSTPCD、、Scopus、北大核心、CSCD、北大核心2020、CSCD_E2021_2022

基金：国家自然科学基金(51822810、51778574);浙江省自然科学基金(LR19E080002);浙江省建设科技基金(2020K127)。

语种：中文

中文关键词：焊接节点;疲劳寿命;扩展有限元;残余应力;焊后热处理

外文关键词：welded joint;fatigue life;extended finite element;residual stress;post-weld heat treatment

中文摘要：为研究残余应力对焊接结构疲劳性能的影响,基于热力耦合计算方法建立了热弹塑性有限元模型,模拟T型节点焊接全过程及焊后热处理的温度场与应力场。基于扩展有限元法建立T型焊接节点断裂力学数值模型,将焊接应力场作为初始条件引入模型并分析其对疲劳裂纹动态扩展行为的影响。结果表明,未考虑残余应力时,焊接节点疲劳裂纹向焊缝两端均匀发展,裂纹扩展形式与试验结果不符;焊后热处理可以显著降低焊接产生的高拉伸应力和压缩应力,但对疲劳寿命的增幅较小,仅为6.1%;考虑残余应力后疲劳裂纹扩展路径与试验更为接近,焊接结构有限元模拟应考虑焊接残余应力对疲劳裂纹扩展路径的影响。

外文摘要：In order to study the influence of residual stress on the fatigue performance of welded structures,a thermo-elastoplastic finite element(FE)model was established via thermal coupling method to simulate the temperature field and stress field during both the whole T-joint welding process and the post-welding heat treatment process.Based on the extended FE method,the numerical model of fracture mechanics of T-shaped welding joints was established.The initial condition of welding stress field was introduced into the model and its influence on the dynamic propagation behavior of fatigue cracks was analyzed.The results show that when residual stress is not taken into account,the fatigue crack of welding joint develops uniformly at both ends of the welding seam,and the crack propagation pattern is not consistent with the experiment.Post-welding heat treatment can significantly reduce the high tensile stress and compression stress generated by welding,but the increase of fatigue life span is less significant,at only 6.1%;considering the residual stress,the fatigue crack growth path is more consistent with the experiment.The influence of welding residual stress on the fatigue crack growth path should be considered in FE simulation of welded structure.