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Étude du comportement dynamique sous choc des verres métalliques massifs

Abstract : Space industry is always searching for efficient materials to protect space structures from high-velocity impacts. In this context, bulk metallic glasses appear as suitable elements of space debris shielding assemblies. Recent studies revealed a higher tolerance to impact of metallic glasses compared to materials currently used in shield assemblies. Gas-gun and powder launchers are usually used to study and characterize the dynamic and shock behaviour of materials. However, projectiles velocities are currently limited to 10 km/s, corresponding to the lowest high-velocity impacts levels. To overcome this limitation, one may consider shock waves induced by high-power laser facilities, whose pressure and strain rate levels can exceed those induced by canons. Hence, this work enabled to study and to characterize the dynamic and damage behaviours of several compositions of ternary ZrCuAl bulk metallic glasses subjected to shock waves induced by laser irradiation. Several experimental campaigns have been conducted on various laser facilities of the Laboratoire pour l'Utilisation des Lasers Intenses (LULI2000 and ELFIE). A part of the equation of state of the studied compositions was established using both shock waves and quasi-isentropic compressions. Damage processes and the composition and strain rate effects on fracture were also studied. For strain rate levels higher of three or more orders of magnitude than those available in the literature, it was shown that studied bulk metallic glasses displayed a five to ten times higher dynamic tensile limit.
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Submitted on : Thursday, April 25, 2019 - 2:42:09 PM
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  • HAL Id : tel-02110616, version 1

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Benjamin Jodar. Étude du comportement dynamique sous choc des verres métalliques massifs. Mécanique des matériaux [physics.class-ph]. Université Rennes 1, 2018. Français. ⟨NNT : 2018REN1S081⟩. ⟨tel-02110616⟩

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