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Dynamic fragmentation of graphite under laser-driven shocks: Identification of four damage regimes

Article dans une revue avec comité de lecture
Author
SEISSON, Gabriel
21150 Centre d'études scientifiques et techniques d'Aquitaine (CESTA-CEA) [CESTA]
118112 Institut Pprime [UPR 3346] [PPrime [Poitiers]]
119523 DAM Île-de-France [DAM/DIF]
PRUDHOMME, Gabriel
119523 DAM Île-de-France [DAM/DIF]
FRUGIER, Pierre Antoine
300016 Commissariat à l'énergie atomique et aux énergies alternatives [CEA]
HÉBERT, David
21150 Centre d'études scientifiques et techniques d'Aquitaine (CESTA-CEA) [CESTA]
LESCOUTE, Emilien
9658 Laboratoire de Détection et de Géophysique (CEA) [LDG]
118112 Institut Pprime [UPR 3346] [PPrime [Poitiers]]
119523 DAM Île-de-France [DAM/DIF]
SOLLIER, Arnaud
119523 DAM Île-de-France [DAM/DIF]
VIDEAU, Laurent
119523 DAM Île-de-France [DAM/DIF]
MERCIER, Patrick
119523 DAM Île-de-France [DAM/DIF]
BOUSTIE, Michel
118112 Institut Pprime [UPR 3346] [PPrime [Poitiers]]
300463 École Nationale Supérieure de Mécanique et d’Aérotechnique [Poitiers] [ISAE-ENSMA]
BERTHE, Laurent
428 Laboratoire pour l'application des lasers de puissance [LALP]
14421 Laboratoire d'Ingénierie des Matériaux [LIM]
31214 Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] [LaMCoS]
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/16035
DOI
10.1016/j.ijimpeng.2015.12.012
Date
2016
Journal
International Journal of Impact Engineering

Abstract

This study presents the results of a large experimental campaign conducted on the Luli2000 laser facility. Thin targets of a commercial grade of porous graphite were submitted to high-power laser-driven shocks leading to their fragmentation. Many diagnostics were used such as high-speed time- and space-resolved imaging systems (shadowgraphy and photography), laser velocimetry (PDV and VISAR), debris collection and post-mortem X-ray tomography. They provided the loading levels into the targets, the spall strength of the material, the shape and size of debris and the localization of the subsurface cracks. The crossed data reduction of all the records showed their reliability and allowed to get a better insight into the damage phenomena at play in graphite. Thereby, four damage regimes, ranked according to their severity and loading level, were identified. It confirms that laser shocks are very complementary to classical impact tests (plates and spheres) since they ally two-dimensional loadings to the possibility of using both, in-situ and post-mortem diagnostics. Finally, the campaign shall be able to provide large and consistent data to develop and adjust reliable models for shock wave propagation and damage into porous graphite.

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