圆锥壳大型开孔围栏焊缝裂纹疲劳寿命分析  

A fatigue life analysis of weld cracks in large openings coaming with cone shell

作　　者：王黄胤 马俊 耿黎明[1] WANG Huangyin;MA JUN;GENG Liming(China Ship Development and Design Center,Wuhan 430064,China;Project Management Center,Naval Armament Department of PLAN,Beijing 100071,China)

机构地区：[1]中国舰船研究设计中心,湖北武汉430064 [2]海军装备部项目管理中心,北京100071

出　　处：《中国舰船研究》2023年第4期242-250,共9页Chinese Journal of Ship Research

基　　金：国家部委基金资助项目。

摘　　要：[目的]旨在研究受均布压载荷的圆锥壳大型开孔围栏焊缝结构中的疲劳寿命问题。[方法]以某水下耐压结构模型作为研究对象,构建有限元模型,使用结构应变方法获取该结构的疲劳危险点并计算该点处疲劳寿命。将计算结果与该水下耐压结构模型的试验数据进行对比,验证结构应变方法在此类结构疲劳寿命评估中的准确性。[结果]结果表明,结构应力最大部位出现在围栏焊缝靠近模型大端一侧,与试验中疲劳裂纹出现位置一致。结构应变方法计算得到的疲劳寿命与实际试验结果基本吻合,实际试验中的疲劳数据落在主e-N曲线的一条窄带上;围栏焊缝危险点处正向结构应力远大于切向结构应力。[结论]结构应变方法可以较好地解释圆锥壳大型开孔围栏焊缝结构的疲劳寿命问题,在此类载荷条件下,危险点处初始裂纹应当为一型。[Objective]This paper analyses the fatigue life of weld cracks in a large opening coaming with a conical shell under uniform pressure load.[Methods]First,a finite element model of an underwater pres-sure-hull structure is built.Next,the peril point and its fatigue life are calculated using the structural strain method.Finally,the accuracy of the structural strain method used in the fatigue life evaluation of the underwa-ter pressure-hull structure is verified through a comparison with the calculated results of the experimental data model.[Results]The results show that the maximum structural stress is located at the weld of the coaming near the large end,which is the same as the appearance location of fatigue cracks in the experiment.The fa-tigue life calculated using the structural strain method shows good agreement with the experimental results,and the data of the model fatigue experiment is located in a narrow band of the master e-N curve.The normal structural stress is far greater than the shear structural stress at the peril point of the coaming weld.[Conclusions]The structural strain method can effectively solve problems with the fatigue life of weld cracks in a large opening coaming with a conical shell.Under the load conditions of this paper,the initial crack at the peril point should be type one.

关 键 词：耐压结构 开孔围栏 焊接接头 低周疲劳 结构应变 

分 类 号：U661.43[交通运输工程—船舶及航道工程]