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首页> 外文期刊>Journal of Materials Engineering and Performance >Very High Cycle Fatigue of a Cast Aluminum Alloy: Size Effect and Crack Initiation
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Very High Cycle Fatigue of a Cast Aluminum Alloy: Size Effect and Crack Initiation

机译：铸铝合金非常高的循环疲劳：尺寸效应和裂纹启动

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摘要

Fatigue properties of an Al-Si-Cu cast alloy were investigated with life up to very high cycle fatigue regime. Particular attention was given to specimen size effect and fatigue crack initiation mechanism. Uniaxial fatigue tests with constant amplitudes were carried out by using ultrasonic fatigue testing machine operating at 20?kHz, compared to the results obtained by using conventional hydraulic fatigue machine at 35?Hz. In order to evaluate the size effect, two sets of specimens with different dimensions were used. The results show that the fatigue strength of the studied alloy decreases with the increase in specimen size. Scanning electron microscopy observation of fracture surfaces revealed that most fatigue cracks initiated from microstructural defects such as porosity located on specimen surface or in subsurface. Weibull statistical analysis of fatigue data accounting for size effect was performed to predict the fatigue life of the Al-Si-Cu alloy in the very high cycle regime. Good agreement was found between the fatigue life prediction and the experimental data.
机译：研究了Al-Si-Cu铸造合金的疲劳性能，达到了非常高的循环疲劳方案。特别注意标本尺寸效应和疲劳裂纹引发机制。与通过在35℃的传统液压疲劳机获得的结果相比，通过使用以20 kHz操作的超声疲劳试验机进行恒定振荡的单轴疲劳试验。为了评估尺寸效果，使用两组具有不同尺寸的样本。结果表明，研究的合金的疲劳强度随着样品尺寸的增加而降低。扫描电子显微镜观察裂缝表面揭示了大多数疲劳裂缝从位于样品表面或地下的孔隙率的微观结构缺陷引发。进行疲劳数据核算尺寸效果的卫生统计分析，以预测非常高循环状态下的Al-Si-Cu合金的疲劳寿命。在疲劳寿命预测和实验数据之间发现了良好的一致性。

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