多轴变幅应力状态下连杆微动疲劳全寿命研究

摘要/Abstract

摘要： 提出了一种适用于多轴变幅疲劳应力作用下的疲劳全寿命计算模型；结合有效应力强度因子幅理论和雨流计数技术处理应力谱，修正了Paris疲劳裂纹扩展速率公式使其适用于多轴变幅应力条件；在修正的Paris公式中引入短裂纹修正尺寸，得到全寿命计算模型；以斜切口式柴油机连杆齿形配合面处的寿命计算为工程算例，基于材料试验和有限元分析，计算得到配合面危险节点的寿命。结果表明，该模型可进行复杂工况下结构表面裂纹从任意初始尺寸扩展到任意设计尺寸的寿命计算，对指导关键性零部件寿命设计和确定检修时间具有重要意义。

关键词: 断裂力学, 多轴变幅应力, 全寿命模型, 连杆齿形配合面

Abstract: A total-life calculation model for fatigue cracks initiating and propagating under multi-axis variable-amplitude stresses was proposed.Based on the effective stress intensity factor criterion and rain-flow counting technique for multi-axis variable-amplitude stresses，the Paris formula was revised to apply to describe the fatigue cracks initiating and propagating behaviors under multi-axis variable-amplitude stresses and a short-crack correction size was introduced to obtain the total-life calculation model.Finally，a life culculation case study on mating surfaces of a obliquely split diesel connecting rod was performed.Based on the material tests and finite element analysis，the life of dangerous spots on the mating surfaces was calculated，which indicats that the total life model may calculate the fatigue life from an arbitrary initial crack size to an arbitrary critical crack size.The total life model may play a prominent role in life design and maintenance work of key components.

Key words: fracture mechanics, multi-axis variable-amplitude stress, total-life model, connecting rod mating surface

中图分类号:

TK428
TK422

汪玲玲;何柏岩. 多轴变幅应力状态下连杆微动疲劳全寿命研究[J]. 中国机械工程.

WANG Lingling;HE Baiyan. Research on Total Fretting Fatigue Lifes of Connecting Rods under Multi-axis Variable-amplitude Stresses[J]. China Mechanical Engineering.

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