基于三维细观力学模型的开孔泡沫弹性性能预测

泡沫材料的宏观力学性能主要取决于基体材料的力学特性及其微细观结构特征，基于细观力学模型的分析方法是泡沫材料力学性能研究的重要途径。文中基于Matlab语言和Abaqus软件构建了描述中等孔隙率开孔弹性泡沫材料微结构特征的三维随机分布球形泡孔模型，并采用有限元方法对弹性泡沫压缩变形进行了模拟，并计算给出了不同孔隙率弹性泡沫材料弹性模量、剪切模量、体积模量以及泊松比的分布，建立了相应的唯象表达式。与理论模型及测试结果的比较表明，本文基于三维随机泡孔模型模拟结果构建的唯象表达式能够对弹性泡沫材料的弹性力学性能给出很好的预测。

Numerical studies on the elastic parameters of medium porosity rubber foams based on 3D micro-mechanical models

The macro-mechanical performances of foams are mainly determined by its micro-structure and the properties of cell material, so it is helpful for foam mechanical performance prediction by constructing a proper micro-mechanical foam model. According to the microstructure of real silicone rubber foams, three dimensional (3D) random spherical cell models are constructed by Matlab language and Abaqus software. Then large compressive deformations are simulated, and the young’s modulus, shear modulus, bulk modulus and Poisson’s ratios of rubber foams are calculated. The constitutive models of the foam elastic properties are performed by numerical fitting. Obtained results reveal that the random models behavior isotropy and the models are effective to predict the elastic performances of rubber foams.