https://doi.org/10.1051/epjconf/201818301060
Numerical Simulations of Laser-Driven Cratering Experiments into Porous Graphite
1
CEA CESTA,
15 Avenue des Sablières, CS60001, Le Barp Cedex,
33116,
France
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
*
e-mail: bertrand.aubert@cea.fr
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
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
