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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Multiaxial fatigue life estimation of defective aluminum alloy considering the microstructural heterogeneities effect
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Multiaxial fatigue life estimation of defective aluminum alloy considering the microstructural heterogeneities effect

机译：微观结构异质效应缺陷铝合金多轴疲劳寿命估算

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摘要

The Al-Si-Mg high-cycle fatigue behavior is mainly affected by the microstructural heterogeneities and the presence of casting defects. This attempt aims to develop an analytical approach based on the evaluation of the highly stressed volume caused by local porosities and defined as the affected area methodology. The proposed approach is able to predict the aluminum alloy fatigue response by considering the effect of microstructure described by the secondary dendrite arm spacing and its correlation with the defect size effect. A representative elementary volume model is implemented to evaluate the stress distribution in the vicinity of the defect and to determine its impact on the high-cycle fatigue resistance. Work hardening due to cyclic loading is considered by applying the Lemaitre-Chaboche model. The Kitagawa-Takahashi diagrams corresponding to different microstructures and for two loading ratios: R-sigma = 0 and R-sigma = -1 were simulated based on the AA method. Simulations were compared to the experimental results carried out on cast aluminium alloy A356 with T6 post heat-treatment. The results show clearly that the proposed approach provides a good estimation of the A356-T6 fatigue limit and exhibits good ability in simulating the Kitagawa-Takahashi diagrams for fine and coarse microstructures.
机译：Al-Si-Mg高循环疲劳行为主要受微观结构异质性的影响和铸造缺陷的存在。这次尝试旨在基于评估局部孔隙症引起的高压力体积并定义为受影响的地区方法的评估来开发分析方法。所提出的方法能够通过考虑次级枝晶臂间距及其与缺陷尺寸效应的相关性来预测铝合金疲劳响应。实施代表性基本体积模型以评估缺陷附近的应力分布，并确定其对高循环疲劳抗性的影响。通过应用Lemaitre-Chaboche模型考虑由于循环载荷引起的工作硬化。基于AA方法模拟了对应于不同微结构和两个加载比率的Kitagawa-Takahashi图：R-Sigma = 0和R-Sigma = -1。将模拟与T6后热处理铸铝合金A356进行的实验结果进行了比较。结果表明，所提出的方法提供了良好估计A356-T6疲劳极限，并在模拟KITAGAWA-TAKAHASHAHI图表的良好估算，用于微观和粗糙的微观结构。

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