经表面机械轧制处理和不经表面机械轧制处理的高强铝合金高周至甚高周疲劳过渡区疲劳特性

IF 5.3 2区 工程技术 Q1 MECHANICS
Zepeng Liu, Jialong Li, Li Zhang
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引用次数: 0

摘要

在室温单轴对称疲劳试验(R = -1)条件下,研究了7075-T651高强铝合金试样经过和未经过表面机械轧制处理(SMRT)后的S-N曲线和破坏模式特征。研究结果表明:SMRT处理后的铝合金试样S-N曲线呈现光滑连续的特征,并根据外加应力幅值的不同,发现了s型(表面破坏)、int型(内部破坏,不含FGA)和ifga型(内部破坏,含FGA)三种疲劳破坏模式。原始7075-T651试样具有s型和ifga型两种破坏模式,S-N曲线呈阶梯状特征。基于应力强度因子范围(ΔK),研究了高周疲劳与甚高周疲劳过渡区失效模式转变的原因。利用Paris-Hertzberg定律计算了不同失效模式下的疲劳裂纹扩展寿命。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fatigue characteristics of high-strength aluminum alloy with and without surface mechanical rolling treatment in the transition regime between high cycle and very-high cycle fatigue
In the present work, the S-N curve and failure mode characteristics of 7075-T651 high-strength aluminum alloy specimens with and without surface mechanical rolling treatment (SMRT) was investigated under uniaxial symmetric fatigue tests (R = -1) at room temperature. The research results showed that the S-N curve of Al alloy specimens treated by SMRT presented smooth and continuous characteristics, and three fatigue failure modes of S-mode (surface failure), Int-mode (internal failure without FGA) and IFGA-mode (internal failure with FGA) were discovered depending on applied stress amplitude level. The original 7075-T651 specimens contained two failure modes of S-mode and IFGA-mode, and the S-N curve showed a step-wise characteristic. The reasons for the transition of the failure mode in transition regime between high cycle (HCF) and very-high cycle fatigue (VHCF) was researched based on the stress intensity factor range (ΔK). Furthermore, Paris-Hertzberg law was used to calculate the fatigue crack growth life of different failure modes.
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来源期刊
CiteScore
8.70
自引率
13.00%
发文量
606
审稿时长
74 days
期刊介绍: EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.
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