Compression of structural foam materials – Experimental and numerical assessment of test procedure and specimen size effects

Abstract

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Experimental and numerical study of the response to various impact energy levels for composite sandwich plates with different face thicknesses

“…The foam-core material exhibits a crushable hardening response in the plastic region [8] and a crushable foam material model available in Abaqus/CAE is used for modeling such behavior. The elastic core response is modeled using elastic properties of the foam material, i.e.…”

“…After the yield stress, the cells in the foam material start crushing without further increase in stress until the foam is crushed and the densification region is reached, near the end of the compression regime. A uni-axial compression curve of the Rohacell 200 Hero foam material is presented by authors in Rajput et al [8] where the plastic region is used as input to the crushable foam hardening model in Abaqus. The crushable foam model is first calibrated by numerically simulating the uni-axial compression response of pure foam material alone.…”

“…Some of the required mechanical properties for the present study are presented in Table 1. The mechanical properties of the core material are presented in Table 2, where the compressive modulus is taken from a recent study performed by the authors in [8].…”

“…A uni-axial compression curve of the Rohacell 200 Hero foam material is presented by authors in Rajput et al. [8] where the plastic region is used as input to the crushable foam hardening model in Abaqus. The crushable foam model is first calibrated by numerically simulating the uni-axial compression response of pure foam material alone.…”

“…In composite structures the impact energy is dissipated in the form of fiber breakage, matrix cracking and delamination. For sandwich structures, face-sheet and core debonding along with core crushing [5][6][7][8] constitute additional damage modes. The damage mechanisms are complex and related to the fiber and matrix combinations [7,9], ply-stacking sequence [10,11] and face-sheet/core thicknesses [7,10,12,13].…”