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Finite Element Analysis on the Unloading Elastic Modulus of Aluminum Foams by Unit-cell Model

机译：单位细胞模型铝泡沫卸料弹性模量的有限元分析

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This paper presents finite element analyses (FEA) on the unloading elastic moduli of aluminum foams under uniaxial loading and bending conditions. The unit-cell model of Gibson and Ashby was utilized in the FEA with elasto-perfectly plastic material. Compression, tension, and bending tests simulations were carried out using Abaqus software. The non-linearity effect caused by structural imperfection/buckling of unit-cell was incorporated. From the compressive test simulation, it was confirmed that the results showed good agreement with the referred experimental data. This means that the developed FE model can be regarded as an RVE model of aluminum foams. Then, the deformation characteristic and elastic modulus obtained from all simulations were compared and examined. As the results, the elastic modulus obtained from bending test demonstrated higher value than that of under uniaxial loads. This discrepancy increases gradually as the relative density decreases. The mechanism responsible for generating the discrepancy in stiffness was discussed. Furthermore, this work points out the necessity of measuring both Young's and flexural moduli for designing an engineering structure using foam materials especially when accuracy and precision are demanded.
机译：本文提出了在单轴载荷和弯曲条件下卸载铝泡沫的卸载弹性模量的有限元分析（FEA）。 Gibson和Ashby的单元电池模型用于具有弹性的完美塑料材料的FEA。使用ABAQUS软件进行压缩，张力和弯曲试验模拟。掺入了由结构缺陷/屈曲引起的非线性效应。从压缩测试模拟中，证实结果表明，与参考的实验数据吻合良好。这意味着开发的Fe模型可以被视为铝泡沫的rve模型。然后，比较和检查从所有模拟中获得的变形特性和弹性模量。结果，从弯曲试验获得的弹性模量比单轴负载下的值较高。随着相对密度降低，这种差异逐渐增加。讨论了负责产生刚度差异的机制。此外，这项工作指出了用于测量使用泡沫材料设计工程结构的杨氏和弯曲模量的必要性，特别是当要求精度和精度时。

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