Characterization of the ballistic properties of ejecta from laser shock-loaded samples using high resolution picosecond laser imaging

Sollier, Arnaud; Lescoute, E.

doi:10.1016/j.ijimpeng.2019.103429

Cited by 15 publications

(4 citation statements)

References 34 publications

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“…The strong shock wave released from the metalvacuum/gas interface may eject a great number of metal particles. [1][2][3][4][5] Most of these particles are of micrometer-scale in size. This phenomenon of ejecta, or microjetting, was first observed by Kormer et al in a plane impact experiment in the 1950s.…”

Section: Introductionmentioning

confidence: 99%

Reconstruction and interpretation of photon Doppler velocimetry spectrum for ejecta particles from shock-loaded sample in vacuum*

Shi¹,

Ma²,

Dang³

et al. 2021

Chinese Phys. B

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The photon Doppler velocimetry (PDV) spectrum is investigated in an attempt to reveal the particle parameters of ejecta from shock-loaded samples in a vacuum. A GPU-accelerated Monte–Carlo algorithm, which considers the multiple-scattering effects of light, is applied to reconstruct the light field of the ejecta and simulate the corresponding PDV spectrum. The influence of the velocity profile, total area mass, and particle size of the ejecta on the simulated spectra is discussed qualitatively. To facilitate a quantitative discussion, a novel theoretical optical model is proposed in which the single-scattering assumption is applied. With this model, the relationships between the particle parameters of ejecta and the peak information of the PDV spectrum are derived, enabling direct extraction of the particle parameters from the PDV spectrum. The values of the ejecta parameters estimated from the experimental spectrum are in good agreement with those measured by a piezoelectric probe.

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Section: Introductionmentioning

confidence: 99%

Reconstruction and interpretation of photon Doppler velocimetry spectrum for ejecta particles from shock-loaded sample in vacuum*

Shi¹,

Ma²,

Dang³

et al. 2021

Chinese Phys. B

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“…For a few years, we have explored how laser-driven shocks can provide some valuable, complementary insights into ejecta physics under pulsed pressure loads of high amplitude (some tens of GPa) and very short duration (a few ns). Our results include measurements of jet velocities using both optical shadowgraphy and Photonic Doppler Velocimetry (PDV) [15][16][17], post-recovery evidence of the jetting process combined with spall fracture [15,17,18], attempts to estimate ejecta size distributions using fast shadowgraphy [16,19,20] or fragment recovery [21], and ultra-fast laser-based X-ray radiography of the jets [17,22,23]. The latter technique was used to evaluate mass ejection from single triangular grooves of controlled depths and angles [17].…”

Section: Introductionmentioning

confidence: 99%

Velocity and mass density of the ejecta produced from sinusoidal grooves in laser shock-loaded tin

Prudhomme

Rességuier

Roland

et al. 2020

Journal of Applied Physics

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When a shock wave of several tens of GPa breaks out at a free surface, material is ejected ahead of this surface. The amount and velocity of such ejecta depend on the breakout pressure, state of the released material (solid, liquid, or mixed), whether the shockwave is supported or unsupported and the initial geometrical perturbation (or roughness) of the free surface. If surface defects consist of small grooves, pits or scratches, material ejection occurs in the form of jets breaking up into tiny particles (so-called microjetting), with jet tip velocities up to several times higher than the free surface velocity.The laser-based experiments presented in this paper focus on microjetting in shock-melted tin with periodic surface perturbations. Several complementary diagnostics are combined to measure the velocity and mass of ejecta during the early stages of the jetting process. One relevant advancement is the use of ps-laser X-ray radiography to probe the density of the ejecta in distinct jets a few tens of µm-wide. The effects of the depth and wavelength of the initial perturbation are investigated in both linear and near-linear growth regimes. The results are compared with predictions derived from the Richtmyer-Meshkov Instability (RMI) theory.

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“…The strong shock wave released from the metalvacuum/gas interface may eject a great number of metal particles. [1][2][3][4][5][6] Most of these particles are of micrometer-scale in size. This phenomenon of ejecta, or microjetting, was first observed by Kormer et al in a plane impact experiment in the 1950s.…”

Section: Introductionmentioning

confidence: 99%

Reconstruction and interpretation of photon Doppler velocimetry spectrum for ejecta particles from shock-loaded sample in vacuum

Shi,

Ma,

Dang

et al. 2020

Preprint

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The photon Doppler velocimetry (PDV) spectrum is investigated in an attempt to reveal the particle parameters of ejecta from shock-loaded samples in a vacuum. A GPU-accelerated Monte-Carlo algorithm, which considers the multiplescattering effects of light, is applied to reconstruct the light field of the ejecta and simulate the corresponding PDV spectrum. The influence of the velocity profile, total area mass, and particle size of the ejecta on the simulated spectra is discussed qualitatively. To facilitate a quantitative discussion, a novel theoretical optical model is proposed in which the single-scattering assumption is applied. With this model, the relationships between the particle parameters of ejecta and the peak information of the PDV spectrum are derived, enabling direct extraction of the particle parameters from the PDV spectrum. The values of the ejecta parameters estimated from the experimental spectrum are in good agreement with those measured by a piezoelectric probe.

show abstract

Characterization of the ballistic properties of ejecta from laser shock-loaded samples using high resolution picosecond laser imaging

Cited by 15 publications

References 34 publications

Reconstruction and interpretation of photon Doppler velocimetry spectrum for ejecta particles from shock-loaded sample in vacuum*

Reconstruction and interpretation of photon Doppler velocimetry spectrum for ejecta particles from shock-loaded sample in vacuum*

Velocity and mass density of the ejecta produced from sinusoidal grooves in laser shock-loaded tin

Reconstruction and interpretation of photon Doppler velocimetry spectrum for ejecta particles from shock-loaded sample in vacuum

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