Ejected particle size measurement using Mie scattering in high explosive driven shockwave experiments

Monfared, Shabnam; Buttler, W. T.; Frayer, Daniel K.; Grover, M.; LaLone, Brandon; Stevens, G. D.; Stone, Joseph B.; Turley, W. D.; Schauer, Martin

doi:10.1063/1.4922180

Cited by 58 publications

(16 citation statements)

References 34 publications

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“…Distinct defects may generate thin jets (which is sometimes referred to as microjetting) while a global roughness can lead to the expansion of a cloud of fine particles (sometimes called material ejection). Because this cloud may disrupt surface diagnostics used in shock physics (velocity interferometry, pyrometry, reflectivity) and because the impact of the ejecta can cause severe damage to nearby equipment in practical, engineering applications, this process has been widely studied both theoretically and experimentally under impact or explosive loading [1][2][3][4][5][6][7][8][9][10][11][12][13]. In a recent paper, we used laser driven shock loading to investigate microjetting from triangular, individual grooves of micrometric dimensions in several metals, both below and above shockinduced melting [14].…”

Section: Introductionmentioning

confidence: 99%

Influence of edge conditions on material ejection from periodic grooves in laser shock-loaded tin

Rességuier

Roland

Prudhomme

et al. 2016

Journal of Applied Physics

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Abstract. In a material subjected to high dynamic compression, the breakout of a shock wave at a rough free surface can lead to the ejection of high velocity debris. Anticipating the ballistic properties of such debris is a key safety issue in many applications involving shock loading, including pyrotechnics and inertial confinement fusion experiments. In this paper, we use laser driven shocks to investigate particle ejection from calibrated grooves of micrometric dimensions and approximately sinusoidal profile in tin samples, with various boundary conditions at the groove edges, including single groove and periodic patterns. Fast transverse shadowgraphy provides ejection velocities after shock breakout. They are found to depend not only on the groove depth and wavelength, as predicted theoretically and already observed in the past, but also, unexpectedly, on the edge conditions, with a jet tip velocity significantly lower in the case of a single groove than behind a periodic pattern.

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Section: Introductionmentioning

confidence: 99%

Influence of edge conditions on material ejection from periodic grooves in laser shock-loaded tin

Rességuier

Roland

Prudhomme

et al. 2016

Journal of Applied Physics

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“…The experimental apparatus and techniques are described in references [18,19], and we give only a brief outline here. Ejecta are produced by a high-explosive (HE) driven shockwave interacting with triangular per-turbations machined into Sn wafers.…”

Section: Techniquementioning

confidence: 99%

“…In particular, understanding the size distribution of the ejected particles and how it is affected by the surface characteristics has been the subject of much work at Los Alamos [7,[18][19][20]. We report here on work to constrain the size distribution of ejected particles through optical scattering.…”

Section: Introductionmentioning

confidence: 99%

“…Characterizing these ejecta has long been an area of active research at Los Alamos National Laboratory and throughout the broader scientific community through both theory [1][2][3][4][5][6][7][8] and experiment [9][10][11][12][13][14][15][16][17][18][19][20]. In particular, understanding the size distribution of the ejected particles and how it is affected by the surface characteristics has been the subject of much work at Los Alamos [7,[18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Constraining ejecta particle size distributions with light scattering

Schauer

Buttler

Sorenson

et al. 2018

AIP Conference Proceedings

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Abstract. We present size distributions for particles ejected from features machined onto the surface of shocked Sn targets. The functional form of the size distributions is assumed to be log-normal, and the characteristic parameters of the distribution are extracted from the measured angular distribution of light scattered from a laser beam incident on the ejected particles. We find strong evidence for a bimodal distribution of particle sizes with smaller particles evolved from features machined into the target surface and larger particles being produced at the edges of these features. Preliminary data on ejecta transported through Helium gas at various pressures is also presented.

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“…The ejecta source and RM sheet breakup has also been studied extensively with MD simulations [55][56][57][58][59][60], and more research on dynamic particle sizing diagnostics is reported, works that includes holography and Mie scattering [61,62].…”

Section: Smentioning

confidence: 99%

Foreword to the Special Issue on Ejecta

Buttler

Williams

Najjar

2017

J. dynamic behavior mater.

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A Brief History of Ejecta Physics 1950s and 1960sThere exists anecdotal evidence that ejecta research began in the 1950s, but little of this early research was documented publicly. In Russia, the ejecta phenomenon was first observed in plate impact experiments, and shown to be dependent on the initial surface roughness [1]. The Los Alamos PHERMEX radiographic facility was used to study the production and interaction of jets from shocked surfaces, starting from its very first shot in 1963 [2]. By 1969, Bristow and Hyde [3] describe the results of a mature program in the UK using photographic imaging of ejecta processes to infer whether melt had occurred at the surface of shocked materials. They showed that drive nonuniformity and subsurface fragmentation (spall/scabbing) were also contributory factors in determining the nature of ejecta produced. 1970sThe earliest published ejecta research was done by James Asay [4]. Asay went on to develop a non-radiographic ejecta diagnostic, the eponymous Asay foil [5]. Later, he developed a prescriptive model of ejecta, where he associated the amount of mass ejected from a shocked surface to the volume of surface defects, the rise time of the shock impulse, the yield strength of the material, and the phase of the material on release, i.e., liquid or solid [6]; interestingly he also observed that ejecta production was independent over broad ranges to the peak loading stress P S . Los Alamos National Laboratory (LANL) also became active in the development of ejecta diagnostics, as released by Hopson and Olinger [7].Ejecta physics is a young field, having developed over the last 60 years or so. Essentially, ejecta forms as a spray of dense particles generated from the free surface of metals subjected to strong shocks, but the detailed mechanisms controlling the properties of this particulate ejecta are only now being fully elucidated. The field is dynamic and rapidly growing, with military and industrial applications, and applications to areas such as fusion research.This Special Issue on Ejecta reports the current state of the art in ejecta physics, describing experimental, theoretical and computational work by research groups around the world. While much remains to be done, the dramatic recent progress in the field, some of it first reported here, means that this volume provides a particularly timely review.In this foreword, we provide a brief historical overview of the development of ejecta physics, to define the context for the work in the rest of this Special Issue.

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Ejected particle size measurement using Mie scattering in high explosive driven shockwave experiments

Cited by 58 publications

References 34 publications

Influence of edge conditions on material ejection from periodic grooves in laser shock-loaded tin

Influence of edge conditions on material ejection from periodic grooves in laser shock-loaded tin

Constraining ejecta particle size distributions with light scattering

Foreword to the Special Issue on Ejecta

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