Ejection of material from shocked surfaces of tin, tantalum and lead-alloys

Andriot, P.; Chapron, P.; Olive, F.

doi:10.1063/1.33316

Cited by 33 publications

(17 citation statements)

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“…Indeed, when the release waves issued from the reflection of the shockwave onto the free surface reach the backside of our crystal, the system comes off the piston that was applied to support the shock. Then the crystal becomes isolated, and when the sheets are ejected, it loses a very small part of its velocity (momentum conservation) that can no more be compensated by the piston, unlike what occurs in hydro computations [1,[17][18] and experiments [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] where the samples have "infinite" (very large) dimensions. Other sources may also explain this difference; in particular the conditions of simulation (supported shockwave at extreme pressure).…”

Section: The Continuum Point Of Viewmentioning

confidence: 99%

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Mass-velocity and size-velocity distributions of ejecta cloud from shock-loaded tin surface using atomistic simulations

Durand

Soulard

2015

Journal of Applied Physics

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Abstract:The mass (volume and areal densities) versus velocity as well as the size versus velocity distributions of a shock-induced cloud of particles are investigated using large scale molecular dynamics (MD) simulations. A generic three-dimensional tin crystal with a sinusoidal free surface roughness (single wavelength) is set in contact with vacuum and shock-loaded so that it melts directly on shock. At the reflection of the shock wave onto the perturbations of the free surface, two-dimensional sheets/jets of liquid metal are ejected. The simulations show that the distributions may be described by an analytical model based on the propagation of a fragmentation zone, from the tip of the sheets to the free surface, within which the kinetic energy of the atoms decreases as this zone comes closer to the free surface on late times. As this kinetic energy drives (i) the (self-similar) expansion of the zone once it has broken away from the sheet and (ii) the average size of the particles which result from fragmentation in the zone, the ejected mass and the average size of the particles progressively increase in the cloud as fragmentation occurs closer to the free surface.Though relative to nanometric scales, our model may help in the analysis of experimental profiles.2

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Section: The Continuum Point Of Viewmentioning

confidence: 99%

“…the distributions of the ejecta in size and velocity. Past theoretical and experimental efforts have shown that surface imperfections of machined material (in particular two-dimensional periodic features for metals) are the main cause of ejecta production [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Mass-velocity and size-velocity distributions of ejecta cloud from shock-loaded tin surface using atomistic simulations

Durand

Soulard

2015

Journal of Applied Physics

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“…In field a it is possible to find stationary shocks compatible with the flow illustrated in Fig. 1, and according surface of the Sn target (Andriot et al 1982).…”

Section: Methodsmentioning

confidence: 97%

Jetting in Oblique, Asymmetric Impacts

Miller

1998

Icarus

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“…Because the characteristic size of the ejecta is expected to be of same order as that of the geometrical defects in the surface, typically ~μm-or sub-μm, this process is sometimes referred to as microjetting. It has been widely studied under explosive loading and plate impacts, both behind free surfaces of random roughness, either "raw" [1] or enhanced on purpose [2][3][4][5], and behind defects of controlled shapes and depths [6,7]. In this paper, we show that laser shock loading of metallic samples with carefully prepared grooves can provide complementary data on microjetting, over a range of very high strain rates, very short pulse duration and small spatial scales.…”

Section: Introductionmentioning

confidence: 98%

Experimental study of microjetting from triangular grooves in laser shock-loaded samples

Rességuier

Roland

Lescoute

et al. 2017

AIP Conference Proceedings

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Abstract. When a shock wave interacts with a free surface, geometrical defects such as scratches, pits or grooves can lead to the production of high velocity, ~μm-size debris. Because their ballistic properties are a key safety issue for various applications involving high pressure dynamic loading, and because these debris may inhibit surface measurements commonly used in shock physics, this process usually referred to as 'material ejection' or 'microjetting' has motivated extensive research work for many years. Recently, we have started a systematic investigation of microjetting under laser driven shock loading of thin metallic samples with calibrated grooves in their free surface. Transverse shadowgraphy (complemented with Photonic Doppler Velocimetry) provides jet velocities for different metals, various groove angles, over a range of shock pressure, both below and above shock-induced melting. Besides, the short duration of pressure application allows partial sample recovery, which provides original insight into the early stage of jet formation.

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Ejection of material from shocked surfaces of tin, tantalum and lead-alloys

Cited by 33 publications

References 0 publications

Mass-velocity and size-velocity distributions of ejecta cloud from shock-loaded tin surface using atomistic simulations

Mass-velocity and size-velocity distributions of ejecta cloud from shock-loaded tin surface using atomistic simulations

Jetting in Oblique, Asymmetric Impacts

Experimental study of microjetting from triangular grooves in laser shock-loaded samples

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