Abstract This study establishes FEM modeling for compressive deformation behavior of polymeric foams with different loading rates. The polymeric foam used in this study was made from polypropylene (the base matrix of the polymer) with porosity of about 95%. The pore size and shape were randomly distributed in the foam. The X-ray CT method was first conducted to observe the microstructure, the geometric feature of which was reproduced in the FEM model. Uniaxial compression tests with different loading speeds were carried out to investigate an effect of loading rate (strain rate) dependency on the deformation behavior. By using the X-ray CT method, in situ observation of microscopic deformation was carried out. Furthermore, FEM computations were carried out to simulate macroscopic and microscopic deformation behaviors. The random porous structure was modeled using Surface Evolver. The elastoplastic property with strain rate dependency was used in this model. The established FEM framework may be useful for a porous polymer with a random pore structure and for deformation modeling with strain rate effect.

中文翻译：

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具有随机孔结构的聚合物泡沫的 FEM 模拟：具有加载速率效应的单轴压缩

摘要 本研究建立了具有不同加载速率的聚合物泡沫压缩变形行为的有限元模型。本研究中使用的聚合物泡沫由聚丙烯（聚合物的基础基质）制成，孔隙率约为 95%。孔径和形状随机分布在泡沫中。X射线CT方法首先用于观察微观结构，其几何特征在有限元模型中再现。进行了具有不同加载速度的单轴压缩试验，以研究加载速率（应变速率）对变形行为的依赖性的影响。利用X射线CT方法，进行了微观变形的原位观察。此外，进行了有限元计算以模拟宏观和微观变形行为。随机多孔结构使用 Surface Evolver 建模。在该模型中使用了具有应变率相关性的弹塑性特性。建立的 FEM 框架可用于具有随机孔结构的多孔聚合物和具有应变率效应的变形建模。