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Observation of the shock wave propagation induced by a high-power laser irradiation into an epoxy material

Article dans une revue avec comité de lecture
Author
ESCAULT, Romain
118112 Institut Pprime [UPR 3346] [PPrime [Poitiers]]
BERTHE, Laurent
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
BOUSTIE, Michel
473 Laboratoire de combustion et de détonique [LCD]
118112 Institut Pprime [UPR 3346] [PPrime [Poitiers]]
TOUCHARD, Fabienne
118112 Institut Pprime [UPR 3346] [PPrime [Poitiers]]
LESCOUTE, Emilien
118112 Institut Pprime [UPR 3346] [PPrime [Poitiers]]
SOLLIER, Arnaud
428 Laboratoire pour l'application des lasers de puissance [LALP]
MERCIER, Patrick
24541 Georgia Tech Lorraine [Metz]
26305 SUPELEC-Campus Metz
BERNIER, Jacky
24541 Georgia Tech Lorraine [Metz]

URI
http://hdl.handle.net/10985/8061
DOI
10.1088/0022-3727/46/23/235501
Date
2014
Journal
Journal of Physics D: Applied Physics

Abstract

The propagation of laser-induced shock waves in a transparent epoxy sample is investigated by optical shadowgraphy. The shock waves are generated by a focused laser (3 ns pulse duration—1.2 to 3.4TWcm−2) producing pressure from 44 to 98.9 GPa. It is observed that the shock wave and the release wave created by the shock reverberation at the rear face are both followed by a dark zone in the pictures. This corresponds to the creation of a tensile zone resulting from the crossing on the loading axis of the release waves coming from the edge of the impact area (2D effects). After the laser shock experiment, the residual stresses in the targets are identified and quantified through a photoelasticimetry analysis of the recovered samples. This work results in a new set of original data which can be directly used to validate numerical models implemented to reproduce the behaviour of epoxy under extreme strain rate loading. The residual stresses observed prove that the high-pressure shocks can modify the pure epoxy properties, which could have an influence on the use made of these materials.

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