Numerical Simulations of Laser-Driven Cratering Experiments into Porous Graphite
15 Avenue des Sablières, CS60001, Le Barp Cedex,
2 Laboratoire PIMM, UPR80006 CNRS-ENSAM, 151 Boulevard de l'Hopital, 75013 Paris, France
3 Laboratoire pour l'Utilisation des Lasers Intenses, UMR7605 CNRS-CEA-Ecole Polytechnique-Universitè Paris VI, 91128 Palaiseau, France
4 CEA DIF, Bruyères-le-Châtel, 91297 Arpajon Cedex, France
5 Institut de Physique de Rennes, CNRS-Universitè de Rennes 1, 35042 Rennes Cedex, France
Published online: 7 September 2018
We present the results of an experimental campaign conducted on the LULI2000 laser facility. Semi-infinite targets of a commercial grade of porous graphite were submitted to high-power laser irradiation inorder to generate craters. A 15 ns pulse duration was used along with a focal spot diameter of 900 µm to deliver energies up to 750 J. Numerical simulations of these shots have been performed following a specificmethodology which can be divided in three steps. Firstly, the mechanical loading induced by the laser iscalibrated by simulating the same shot on a thin aluminum target of which free surface velocity is measured byPDV and line-VISAR. Secondly, the same shot is performed on a thin graphite target to validate the materialmodel of graphite. Thirdly, the craterization shot on semi-infinite target is simulated. Numerical results arecompared to experimental measurements of craters obtained using an interferometric profilometer.
© The Authors, published by EDP Sciences, 2018
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