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首页> 外文会议>The Third International Symposium on Fretting Fatigue: Advances in Basic Understanding and Applications; May 15-18, 2001; Nagaoka, Japan >Local Fretting Regime Influences on Crack Initiation and Early Growth
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Local Fretting Regime Influences on Crack Initiation and Early Growth

机译：局部微动状态对裂纹萌生和早期生长的影响

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摘要

An investigation of fatigue crack initiation and propagation under fretting conditions is described in which both experimental and theoretical approaches are used. Fretting tests were conducted on an aerospace aluminium alloy. The approach presented here aims to describe the propagation of a fretting crack through a step-by-step understanding of the different stages of its life (1) Stage I crack initiation, i.e., sites, growth directions and fracture mode, (2) Stage I-to-Stage II transition as a result of the competition between failure modes, i.e the branching depth and the growth direction after branching. This methodology was successfully applied to fretting fatigue data obtained under the Partial Slip Regime (PSR). Pertinent parameters were proposed to deal with items (1) and (2) depending on the ranges of shear and tensile stresses and their respective roles in crack growth. This step-by-step methodology is used here to analyze the influence on crack initiation and propagation of the local fretting regime and the associated mechanical stress-strain state.
机译：描述了在微动条件下疲劳裂纹萌生和扩展的研究，其中使用了实验方法和理论方法。在航空铝合金上进行微动试验。此处介绍的方法旨在通过逐步了解微动裂纹的寿命来描述微动裂纹的传播（1）第一阶段裂纹萌生，即部位，生长方向和断裂模式，（2）阶段失效模式（即分支深度和分支之后的生长方向）之间竞争的结果是I到II期的过渡。该方法已成功应用于微分疲劳制度（PSR）下获得的微动疲劳数据。根据剪切应力和拉伸应力的范围及其在裂纹扩展中的作用，提出了相关的参数来处理项目（1）和（2）。此分步方法学在这里用于分析对裂纹萌生和局部微动区域扩展以及相关的机械应力-应变状态的影响。

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