Hypervelocity impacts into porous graphite: Experiments and simulations
Article dans une revue avec comité de lecture
Author
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118112 Institut Pprime [UPR 3346] [PPrime [Poitiers]]
21150 Centre d'études scientifiques et techniques d'Aquitaine (CESTA-CEA) [CESTA]
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7841 Département de Physique Théorique et Appliquée [DPTA]
21150 Centre d'études scientifiques et techniques d'Aquitaine (CESTA-CEA) [CESTA]
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598 Centre d'Etudes Lasers Intenses et Applications [CELIA]
21150 Centre d'études scientifiques et techniques d'Aquitaine (CESTA-CEA) [CESTA]
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21150 Centre d'études scientifiques et techniques d'Aquitaine (CESTA-CEA) [CESTA]
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580 Centre interuniversitaire de recherche et d'ingénierie des matériaux [CIRIMAT]
583 Institut de pharmacologie et de biologie structurale [IPBS]
3159 Laboratoire d'Analyse des Signaux et des Processus Industriels [LASPI]
45202 CEA Le Ripault [CEA Le Ripault]
Date
2017Journal
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering SciencesAbstract
We present experiments and numerical simulations of hypervelocity impacts of 0.5mm steel spheres into graphite, for velocities ranging between 1100 and 4500ms?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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