Hypervelocity impacts into porous graphite: experiments and simulations
TypeArticles dans des revues avec comité de lecture
We present experiments and numerical simulations of hypervelocity impacts of 0.5 mm steel spheres into graphite, for velocities ranging between 1100 and 4500 m s−1. Experiments have evidenced that, after a particular striking velocity, depth of penetration no longer increases but decreases. Moreover, the projectile is observed to be trapped below the crater surface. Using numerical simulations, we show how this experimental result can be related to both materials, yield strength. A Johnson–Cook model is developed for the steel projectile, based on the literature data. A simple model is proposed for the graphite yield strength, including a piecewise pressure dependence of the Drucker–Prager form, which coefficients have been chosen to reproduce the projectile penetration depth. Comparisons between experiments and simulations are presented and discussed. The damage properties of both materials are also considered, by using a threshold on the first principal stress as a tensile failure criterion. An additional compressive failure model is also used for graphite when the equivalent strain reaches a maximum value. We show that the experimental crater diameter is directly related to the graphite spall strength. Uncertainties on the target yield stress and failure strength are estimated.
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SEISSON, G; HEBERT, D; BERTRON, I; CHEVALIER, J.-M; HALLO, L.; LESCOUTE, E; VIDEAU, L; COMBIS, P; GUILLET, F; BOUSTIE, M; BERTHE, Laurent (ELSEVIER, 2013)The cratering process in brittle materials under hypervelocity impact (HVI) is of major relevance for debris shielding in spacecraft or high-power laser applications. Amongst other materials, carbon is of particular interest ...
Penetration and cratering experiments of graphite by 0.5-mm diameter steel spheres at various impact velocities SEISSON, G; HEBERT, D; HALLO, L; CHEVALIER, J.M; GUILLET, F; BERTHE, Laurent; BOUSTIE, M (ELSEVIER, 2014)Cratering experiments have been conducted with 0.5-mm diameter AISI 52100 steel spherical projectiles and 30-mm diameter, 15-mm long graphite targets. The latter were made of a commercial grade of polycrystalline and porous ...
HEBERT, D; BERTRON, I; CHEVALIER, J.M; HALLO, L; LESCOUTE, E; VIDEAU, L; COMBIS, P; GUILLET, F; BERTHE, Laurent; SEISSON, G.; BOUSTIE, M. (ELSEVIER, 2013)The cratering process in brittle materials under hypervelocity impact (HVI) is of major relevance for debris shielding in spacecraft or high-power laser applications. Amongst other materials, carbon is of particular interest ...
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