108 微細構造を考慮した軟質発泡材料の均質化解析(OS9 オーガナイズドセッション《計算力学と数値シミュレーション》)

Abstract

In this study, a homogenization analysis of foam materials to consider the microscopic structure was conducted. A foam material was defined as a material which has a eriodical microscopic structure. Deformation of the microscopic structure was uniform, and microscopic periodicity was kept under finite deformation. The polymer matrix was assumed to have incompressible hyperelasticity, which was represented by the Mooney-Rivlin model. An original 2-dimensional simulation program was developed. Uniaxial tensile tests using foam materials were conducted to investigate the effect of porosity on mechanical characteristics. Specimen porosities were 26%, 61%, 66%, and 76%, and pore shape was nearly spherical under microscope observation. The simulation model also had periodic and equally-sized pores. Uniform deformation and periodic boundary condition were applied to the unit cell. The applicability of the proposed model for foam materials was shown by comparing the numerical simulation with the mechanical loading test results.