基于裂纹萌生期限的典型零件剩余寿命预测  

Crack Initiation Period-based Rest Life Prediction of Typical Parts

作　　者：宋守许[1] 张敬东[1] 刘志峰[1] 

机构地区：[1]合肥工业大学,合肥230009

出　　处：《中国机械工程》2011年第20期2490-2494,共5页China Mechanical Engineering

基　　金：国家自然科学基金资助重点项目(50735006);国家自然科学基金资助项目(50905052);国家科技支撑计划项目(2008BAC46B01);安徽省科技计划项目(08010202010)

摘　　要：将有限元分析方法与疲劳寿命预测相结合,以曲轴为对象,对循环载荷导致的疲劳断裂进行了研究。以实际裂纹检测精度定义的疲劳裂纹萌生极限尺寸为计算标准,通过ABAQUS有限元分析计算整体应力应变,采用子结构分析由名义载荷得出的局部最大名义应力载荷谱,结合Ohij疲劳寿命法则准确计算出裂纹萌生期限,实现了基于裂纹萌生的剩余寿命预测。Combining the method of finite element analysis with fatigue life prediction, fatigue trac ture led by cyclic load was studied with crankshaft as the object. Based on the actual crack detection accuracy of the fatigue crack initiation limits as the size of the computational standard,the comprehen sive stress and strain were obtained through finite element analysis, then using substructure analysis the spectrum of local maximum load nominal stress was calculated, integrated with fatigue life law the period of the crack initiation was goten precisely. The rest life prediction was realized based on the crack initiation. It provides a method to predict the rest of life for low stress high cycle fatigue led by cyclic load.

关 键 词：裂纹萌生 疲劳断裂 剩余寿命 Ohij疲劳寿命法则 

分 类 号：TH133.5[机械工程—机械制造及自动化]