Effect of Scale, Material Strength, and Loading on Ejecta Formation from Explosively Driven Aluminum

Georges, William; Loiseau, Jason; Higgins, Andrew; Zimmermann, J.

doi:10.1007/s40870-017-0127-1

Cited by 9 publications

(2 citation statements)

References 35 publications

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“…In the 70s, interferometric methods were first developed and used for velocity measurements of explosively driven flyers [27]. Nowadays, photonic Doppler velocimetry (PDV) is the method of choice for continuous projectile velocity measurements [4,28,29]. This method has also been used to obtain the most detailed existing shaped charge jet velocity records [10].…”

Section: Introductionmentioning

confidence: 99%

Simple flash screens for shaped charge jet and flyer velocity measurements

Künzel¹,

Kučera²,

Kvapil³

et al. 2020

Meas. Sci. Technol.

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The paper describes a novel technique for measuring the velocity of fast flying objects. The technique utilises a series of simple single-use screens which are placed along the expected flight path. The projectile interaction with the screen generates a flash of light which is captured by an optical fibre connected to the light detecting device. The velocities are calculated from the signal arrival times and screen positions. The flash screens were tested using copper shaped charge jets and flyer discs accelerated by explosive charges made of sensitised nitromethane. In addition to the simple time of arrival measurement with VOD-815, the light signals were recorded using an OPTIMEX-64 light analyser which enabled checking their intensity and reproducibility. Some of the experiments were also carried out using a UHSi 12/24 high-speed camera. The flyer plate velocities measured were compared with empirical calculations from a Gurney model.

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Section: Introductionmentioning

confidence: 99%

Simple flash screens for shaped charge jet and flyer velocity measurements

Künzel¹,

Kučera²,

Kvapil³

et al. 2020

Meas. Sci. Technol.

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“…The ability of viscosity to reduce the growth rate of Richtmyer-Meshkov instabilities (RMI) in fluids has been studied for some time [1][2][3][4][5]. The sensitivity of RMI to strength in solids, the analog of viscosity, has received explicit attention more recently [6][7][8][9][10][11][12] with increasing attention also in regard to ejecta [13][14][15][16]. Since the proposal about a decade ago to use RMI to evaluate strength [17,18], several experimental efforts to use this capability have been reported [19][20][21][22][23][24][25][26][27][28][29], although in many cases the experiments serve as validation experiments for strength models rather than providing quantitative estimates of strength.…”

Section: Introductionmentioning

confidence: 99%

Tantalum strength at extreme strain rates from impact-driven Richtmyer-Meshkov instabilities

et al. 2019

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Recently, Richtmyer-Meshkov instability (RMI) experiments driven by high explosives and fielded with perturbations on a free surface have been used to study strength at extreme strain rates and near zero pressure. The RMI experiments reported here used impact loading, which is experimentally simpler, more accurate to analyze, and which also allows the exploration of a wider range of conditions. Three experiments were performed on tantalum at shock stresses from 20 to 34 GPa, with six different perturbation sizes at each shock level, making this the most comprehensive set of strength-focused RMI experiments reported to date on any material. The resulting estimated average strengths of 1200-1400 MPa at strain rates of 10 7 /s exceeded, by 40% or more, a common power law extrapolation from data at strain rates below 10 4 /s. Taken together with other data in the literature that show much higher strength at simultaneous high rates and high pressure, these RMI data isolated effects and indicated that, in the range of conditions examined, the pressure effects are more significant than rate effects.

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