基于界面端奇异应力场的微动疲劳强度和寿命的评价方法
首发时间:2004-12-27
摘要:由于有很多因素影响微动疲劳的强度和寿命,传统的疲劳评价方法不能很好处理这类问题。本文基于界面力学理论,提出了一种新的微动疲劳评价方法。微动疲劳裂纹一般产生在接触界面端附近,而接触界面端附近的奇异应力场,则包含了各种直观因素的综合影响,因此可以用它来建立统一并且定量的评价方法。本文还通过微动疲劳实验,验证了所提出的方法的有效性。
关键词: 微动疲劳 接触界面 应力奇异性 疲劳裂纹 初期裂纹
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An Interfacial Mechanics Approach for the Evaluation of Fretting Fatigue Strength and Life
Abstract:The conventional method of common fatigue cannot deal with fretting fatigue well, since there are so many factors that influence the fretting fatigue strength. This paper proposed the evaluation method based on the interfacial mechanics. Focusing on the singular stress field near the contact edge, where fatigue cracks initiate at the early stage of fretting fatigue, it is found all geometrical and mechanical factors can be considered as being covered in the singular stress field, thereby, generalized and quantitative evaluation should be set up on the singular field. Through some experimental results, the proposed method is verified.
Keywords: Fretting Fatigue, Contact Interface, Stress Singularity, Fatigue crack, Crack Initiation
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No.1391188241104112****
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