Tomography and Simulation of Microstructure Evolution of a Closed-Cell Polymer Foam in Compression

摘要: Closed-cell foams in compression exhibit complex deformation characteristics that remain incompletely understood. In this paper the microstructural evolution of closed-cell polymethacrylimide foam was simulated undergoing elastic, compaction, and densification stages. The three-dimensional microstructure is determined using Micro-Computed Tomography (μ-CT), converted to material points for simulations point method (MPM). properties cell-walls are from nanoindentation on wall foam. MPM captured three stages deformations compression. Features microstructures compared qualitatively with in-situ observations under μ-CT. stress-strain curve compares reasonably experimental results. Based results μ-CT simulations, it found elastic buckling occurs even elastic...