基于裂纹萌生期限的典型零件剩余寿命预测

中国机械工程 ›› 2011, Vol. 22 ›› Issue (20): 2490-2494.

基于裂纹萌生期限的典型零件剩余寿命预测

宋守许;张敬东;刘志峰

合肥工业大学,合肥,230009

出版日期:2011-10-25 发布日期:2011-11-02
基金资助:
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)
Key Program of National Natural Science Foundation of China（No. 50735006）;

National Natural Science Foundation of China（No. 50905052）;

The National Key Technology R&D Program（No. 2008BAC46B01）;
Anhui Provincial Science and Technology program ( No. 08010202010)

Crack Initiation Period-based Rest Life Prediction of Typical Parts

Song Shouxu;Zhang Jingdong;Liu Zhifeng

Hefei University of Technology,Hefei,230009

Online:2011-10-25 Published:2011-11-02
Supported by:

Key Program of National Natural Science Foundation of China（No. 50735006）;

National Natural Science Foundation of China（No. 50905052）;

The National Key Technology R&D Program（No. 2008BAC46B01）;
Anhui Provincial Science and Technology program ( No. 08010202010)

摘要/Abstract

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。

关键词:

裂纹萌生, 疲劳断裂, 剩余寿命, Ohij疲劳寿命法则

Abstract:

Combining the method of finite element analysis with fatigue life prediction,fatigue fracture 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 comprehensive 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.

Key words: crack initiation, fatigue fracture, rest life, law of Ohij fatigue life

中图分类号:

TH133.5

宋守许, 张敬东, 刘志峰.

基于裂纹萌生期限的典型零件剩余寿命预测

[J]. 中国机械工程, 2011, 22(20): 2490-2494.

SONG Shou-Hu, ZHANG Jing-Dong, LIU Zhi-Feng.

Crack Initiation Period-based Rest Life Prediction of Typical Parts

[J]. China Mechanical Engineering, 2011, 22(20): 2490-2494.

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