摘要
基于扩展有限元方法和低周疲劳分析技术,针对带点蚀构件,探究点蚀形式和点蚀尺寸对疲劳裂纹扩展的影响规律,并提出锥形蚀坑构件的疲劳裂纹扩展寿命周期预测公式。结果表明:当蚀坑深度和半径相同时,锥形蚀坑构件的疲劳裂纹扩展寿命最短,锥形蚀坑与疲劳损伤耦合效应最大,是工程中最危险的点蚀形式;锥形蚀坑的半径和深度对裂纹扩展的影响具有交互性,深度是较为重要的耦合影响参数。
The extended finite element method and low-cycle fatigue analysis were used to investigate the effects of pitting forms and sizes on fatigue crack propagation in components with pitting corrosion.A prediction formula for the fatigue-crack-propagation life for components with conical pits was proposed.The results show that when the depth and radius of the pits are identical,the fatigue-crackpropagation life of the conical pits is the shortest,and the coupling effects between the conical pits and fatigue damage are the most serious,which means that conical pits are the most dangerous pitting form in engineering structures subject to fatigue.The influence of the radius and depth of the conical pits on crack propagation is interactional,and the depth is a key coupling parameter.
作者
胡志远
滑林
闵少松
王金
吴梵
HU Zhi-yuan;HUA Lin;MIN Shao-song;WANG Jin;WU Fan(Naval Engineering and Ocean College,Naval University of Engineering,Wuhan 430033,China;Naval Military Representative Office in Jiangnan Shipyard(Group)Co.,Ltd.,Shanghai 201913,China)
出处
《船舶力学》
EI
CSCD
北大核心
2022年第12期1840-1848,共9页
Journal of Ship Mechanics
基金
国家自然科学基金青年项目(52001326)
国家自然科学基金面上项目(51779261)
海军工程大学自然科学基金项目(2020505030)。
关键词
船体结构
点蚀
裂纹扩展
裂纹寿命周期预测
hull structure
pitting corrosion
crack propagation
fatigue crack propagation life prediction
