Numerical Simulations of Laser-Driven Cratering Experiments into Porous Graphite

Abstract : 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. © 2018 The Authors, published by EDP Sciences.
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Bertrand Aubert, David Hébert, Jean-Luc Rullier, Jean-Marc Chevalier, Laurent Berthe, et al.. Numerical Simulations of Laser-Driven Cratering Experiments into Porous Graphite. 12th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading, DYMAT 2018, Sep 2018, Arcachon, France. pp.1060, ⟨10.1051/epjconf/201818301060⟩. ⟨hal-01904697⟩

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