Abstract Fatigue life analysis of porous materials such as metal foams is very difficult to process because a comprehensive computational analysis using numerical models with a huge number of finite elements is required for that purpose. Instead of modelling the exact internal structure of treated porous materials, an appropriate homogenised material model of AlSi7 closed-cell aluminium foam is used in this study. The numerical analysis is based on the available experimental results from static and fatigue tests made on cylindrical porous specimens. A kinematic hardening model is proposed, to obtain the cyclic stress−strain response which is needed for the subsequent fatigue analysis to determine the fatigue life of a treated porous structure under oscillating tensile loading with the stress ratio R = 0.1. The numerically determined fatigue lives are compared with the experimental results, where the comparison has shown a reasonable agreement. Therefore, the proposed homogenised material model can be identified as an appropriate approach to simulate the fatigue behaviour of engineering components made of closed-cell aluminium foam.

中文翻译：

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使用均质材料模型对闭孔泡沫铝进行低周疲劳分析

摘要 多孔材料（例如泡沫金属）的疲劳寿命分析非常难以处理，因为为此需要使用具有大量有限元的数值模型进行综合计算分析。本研究没有模拟处理过的多孔材料的确切内部结构，而是使用了 AlSi7 闭孔泡沫铝的适当均质材料模型。数值分析基于对圆柱形多孔试样进行的静态和疲劳测试的可用实验结果。提出了一个运动硬化模型，以获得循环应力应变响应，这是后续疲劳分析所需的，以确定处理过的多孔结构在应力比 R = 0.1 的振荡拉伸载荷下的疲劳寿命。将数值确定的疲劳寿命与实验结果进行比较，比较结果显示出合理的一致性。因此，所提出的均质材料模型可以确定为模拟由闭孔泡沫铝制成的工程部件的疲劳行为的合适方法。