Ejection of spalled layers from laser shock-loaded metals

E. Lescoute (1) , T. de Resseguier (1) , J.-M. Chevalier (2) , D. Loison (1) , J.P. Cuq-Lelandais (1) , M. Boustie (1) , J. Breil (3) , P.-H. Maire (2) , G. Schurtz (3)

1 PPrime [Poitiers] - Institut Pprime [UPR 3346]
2 CESTA - Centre d'études scientifiques et techniques d'Aquitaine
3 CELIA - Centre d'Etudes Lasers Intenses et Applications

Dynamic fragmentation of shock-loaded metals is an issue of considerable importance for both basic science and a variety of technological applications, such as inertial confinement fusion, which involves high energy laser irradiation of thin metallic shells. In this context, we present an experimental and numerical study of debris ejection in laser shock-loaded metallic targets (aluminum, gold, and iron) where fragmentation is mainly governed by spall fracture occurring upon tensile loading due to wave interactions inside the sample. Experimental results consist of time-resolved velocity measurements, transverse optical shadowgraphy of ejected debris, and postshock observations of targets and fragments recovered within a transparent gel of low density. They are compared to numerical computations performed with a hydrodynamic code. A correct overall consistency is obtained.

Domaines: Matériaux et structures en mécanique [physics.class-ph]; Sciences de l'ingénieur [physics]

E. Lescoute, T. de Resseguier, J.-M. Chevalier, D. Loison, J.P. Cuq-Lelandais, et al.. Ejection of spalled layers from laser shock-loaded metals. Journal of Applied Physics, 2010, 108 (9), pp.093510. ⟨10.1063/1.3500317⟩. ⟨hal-01136321⟩