Enhancement of a dynamic porous model considering compression-release hysteresis behavior: application to graphite

Abstract

Because of their shock wave attenuation properties, porous materials and foams are increasingly used for various applications such as graphite in the aerospace industry and polyurethane (PU) foams in biomedical engineering. For these two materials, the absence of residual compaction after compression and release cycles limits the efficiency of the usual numerical dynamic porous models such as Pα and POREQST. In this paper, we suggest a simple enhancement of the latter in order to take into account the compressionrelease hysteresis behavior experimentally observed for the considered materials. The new model, named HPOREQST, was implemented into a Lagrangian hydrocode and tested for simulating plate impact experiments at moderate pressure onto a commercial grade of porous graphite (EDM3). It proved to be in far better agreement with experimental data than the original model which encourages us to pursue numerical tests and developments.

Dynamic fragmentation of graphite under laser-driven shocks: Identification of four damage regimes

“…The present authors have recently studied the dynamic behavior of porous graphite under high or hypervelocity impacts of metallic plates and spheres [22][23][24][25][26][27]. On the one hand, for plate impact experiments, all the phenomena are one-dimensional.…”

Hypervelocity impacts into porous graphite: experiments and simulations

“…The expected resulting movement is indicated in figure 10 with yellow arrows. Introducing this behaviour in the simulations is not possible with POREQST, but an evolution of this model has been proposed to take this into account [27]. We expect that it will help the simulations to allow more quantitative comparison with experimental observations, especially the crater closure on the projectile path.…”