Modelling the crushing behavior of a ceramic brittle foam

Abstract eng:
This paper presents some experimental results and numerical computations carried out to model the quasi-static crushing behavior of an open-cell ceramic foam (OCCF). The aim was to identify a continuum model able to predict the mechanical response under complex compression loading paths. Different multiaxial compression tests have been performed to characterize the 3D-response of the material, which is slightly anisotropic, strongly non-linear and dependent on the compaction level. It has been shown that the Deshpande-Fleck (DF) yield criterion which depends on both the mean stress and the von Mises effective stress fit the experimental data well. The original DF model developed for foams has been modified by introducing a dependence of the plastic Poisson’s ratio with the plastic volumetric strain to improve the prediction of the radial expansion. It has been implemented into the finite-element code LS-Dyna via an usermat subroutine. Results of a simulation of a lab-scale shock absorber subjected to compression are in close agreement with the experimental results and validate the model robustness.

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