Microjetting from grooved surfaces in metallic samples subjected to laser driven shocks

When a shock wave propagating in a solid sample reflects from a free surface, geometrical effects predominantly governed by the roughness and defects of that surface may lead to the ejection of tiny jets that may breakup into high velocity, approximately micrometer-size fragments. This process refer...

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Bibliographic Details
Published in:Journal of applied physics 2014-01, Vol.115 (4)
Main Authors: de Rességuier, T., Lescoute, E., Sollier, A., Prudhomme, G., Mercier, P.
Format: Article
Language:English
Subjects:
Applied physics
APPROXIMATIONS
Armor
COMPARATIVE EVALUATIONS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Design engineering
Ejection
Explosive impact tests
FRAGMENTATION
Free surfaces
Grooves
Impact loads
IRRADIATION
LASER RADIATION
LOADING
METALS
Pyrotechnics
ROUGHNESS
Shock wave propagation
SHOCK WAVES
STRAIN RATE
SURFACES
TIME RESOLUTION
WAVE PROPAGATION
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Summary:When a shock wave propagating in a solid sample reflects from a free surface, geometrical effects predominantly governed by the roughness and defects of that surface may lead to the ejection of tiny jets that may breakup into high velocity, approximately micrometer-size fragments. This process referred to as microjetting is a major safety issue for engineering applications such as pyrotechnics or armour design. Thus, it has been widely studied both experimentally, under explosive and impact loading, and theoretically. In this paper, microjetting is investigated in the specific loading conditions associated to laser shocks: very short duration of pressure application, very high strain rates, small spatial scales. Material ejection from triangular grooves in the free surface of various metallic samples is studied by combining transverse optical shadowgraphy and time-resolved velocity measurements. The influences of the main parameters (groove angle, shock pressure, nature of the metal) on jet formation and ejection velocity are quantified, and the results are compared to theoretical estimates.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4863719