Unraveling the Science of Variable Amplitude Fatigue

R. Sunder, S. Daniewicz, S. Dean
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引用次数: 38

Abstract

Conventional methods to estimate variable-amplitude fatigue life revolve either around cumulative damage analysis using the local stress-strain approach, or, around one of the crack growth load interaction models. Despite advances in modeling the mechanics of fatigue, none of these methods can faithfully reproduce the near-threshold variable amplitude fatigue response that determines the durability of machines and structures primarily because they fail to model the science behind the residual stress effect. Residual stress effects have a strong bearing on metal fatigue and owe their influence to the moderation of crack-tip surface chemistry and surface physics. This demands the treatment of threshold stress intensity as a variable, sensitive to load history. The correct estimation of crack closure is also crucial to determining the variable amplitude fatigue response and demands assessment of the cyclic plastic zone stress-strain response.
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揭示变幅疲劳的科学
估计变幅疲劳寿命的传统方法要么围绕使用局部应力-应变方法的累积损伤分析,要么围绕裂纹扩展载荷相互作用模型之一。尽管在模拟疲劳力学方面取得了进展,但这些方法都不能忠实地再现决定机器和结构耐久性的近阈值变幅疲劳响应,主要是因为它们不能模拟残余应力效应背后的科学。残余应力效应对金属疲劳有很强的影响,其影响是由于裂纹尖端表面化学和表面物理的调节。这就要求将阈值应力强度作为一个变量,对载荷历史敏感。裂纹闭合的正确估计对于确定变幅疲劳响应和循环塑性区应力-应变响应的需求评估也至关重要。
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