考虑焊接残余应力释放的结构疲劳寿命分析方法研究  

Fatigue life analysis considering welding residual stress release

作　　者：沈言 罗广恩[1] 蒋小伟[2,3] 李远鹤 郑远昊 SHEN Yan;LUO Guang-en;JIANG Xiao-wei;LI Yuan-he;ZHENG Yuan-hao(School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China;Jiangsu Automation Research Institute,Lianyungang 222061,China;School of Mechanical and Vehicle Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]江苏科技大学船舶与海洋工程学院,江苏镇江212003 [2]江苏自动化研究所,江苏连云港222061 [3]北京理工大学机械与车辆学院,北京100081

出　　处：《船舶力学》2021年第7期935-945,共11页Journal of Ship Mechanics

基　　金：江苏省自然科学基金资助项目(BK20150468)。

摘　　要：焊接残余应力对于焊接结构的疲劳寿命产生很显著的影响,同时循环载荷作用下焊接残余应力会出现释放现象,因此有必要对焊接件疲劳寿命预测方法进行研究。基于改进的McEvily疲劳裂纹扩展速率模型,同时结合课题组研究得到的AH36钢对接焊平板残余应力释放计算公式,提出考虑焊接残余应力释放的结构物疲劳寿命计算方法。随后,以潜艇锥柱耐压壳的疲劳为例,详细阐述了本文提出的疲劳寿命分析方法的计算流程。考虑耐压壳焊接顺序影响,分析了含半椭圆表面裂纹的锥柱耐压壳疲劳寿命。对比文献的试验结果,表明焊接结构疲劳寿命计算公式有较好的预测效果,可以用于评估带表面裂纹焊接件在拉伸循环载荷作用下的疲劳寿命。The welding residual stress has a significant effect on the fatigue life of a welded structure,and will be released under the cyclic loading process.Therefore,it is necessary to study the fatigue life prediction method of welded parts.Based on the fatigue crack growth rate model proposed and verified by the research group,combined with the calculated residual stress release formula of AH36 steel butt welded plate,a fatigue life calculation method considering of structural residual stress was proposed.Then,taking the submarine cone-column pressure-resistant shell as the research object,considering the influence of the welding sequence,the fatigue life analysis under the tensile load and the condition of semi-elliptical surface crack in the cone-cone position of the cone-column pressure shell was carried out and the predicted results were compared with the test results from the literature.It is shown that the fatigue life calculation formula of welded structures has a good predictive capability and can be used to evaluate the fatigue life of surface cracks in welded parts under tensile load.

关 键 词：裂纹扩展速率 残余应力释放 疲劳寿命 锥柱耐压壳 

分 类 号：TG404[金属学及工艺—焊接]