Experimental and Computational Damage and Ejecta Studies of Pb Explosively Shock Loaded to $$P_{SL} \approx 32$$ P S L ≈ 32 - to 40-GPa

Antipov, M. V.; Аринин, В. А.; Georgievskaya, A. B.; Gnutov, I. S.; Zamyslov, D. N.; Kalashnikov, D. A.; Lebedeva, M. O.; Lebedev, A. I.; Михайлов, А. Л.; Огородников, В. А.; Panov, K. N.; Pupkov, A. S.; Rayevskiy, V. A.; Sokolova, A. S.; Syrunin, M. A.; Tkachenko, B. I.; Utenkov, A. A.; Федоров, А. В.; Finyshin, S. A.; Chudakov, E. A.; Yurtov, I. V.

doi:10.1007/s40870-017-0113-7

Cited by 12 publications

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“…By contrast, the originally proposed method to quantitatively estimate strength used the total integrated spike growth as the experimental metric, but that method was based on calculations for a general RMI configuration with a perturbed interface between two materials [18]. In our more limiting case with perturbations on the free surface, local interactions of release waves from the perturbed surface eventually result in tensile stresses leading to damage in the form of porosity for a ductile metal [38,39]. In previous work, it was demonstrated that the peak spike velocity occurred early enough to be unaffected by porosity, and it still has excellent sensitivity to strength; hence it makes an ideal metric [22].…”

Section: Analysis Approach and Modelingmentioning

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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