Shear strength of aluminum and copper at shockless compression

Bat'kov, Yu. V.; Knyazev, V. N.; Novikov, S. A.; Raevski, V. A.; Fishman, Norman

doi:10.1051/jp4:20009131

Cited by 3 publications

(4 citation statements)

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“…Though the error bars were rather large, they found that the shear stress of copper was essentially the same for shock and isentropic loading to nearly 12 GPa. This contradicts the results of [62] as well as the self consistent results of [55] that showed a large increase in strength from the HEL to about 12 GPa. Rosenberg et al also found the strength of iron and mild steel to be somewhat higher under isentropic loading than shock loading.…”

Section: Strength Under Isentropic Loadingcontrasting

confidence: 79%

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Strength behavior of materials at high pressures

Vogler

Chhabildas

2006

International Journal of Impact Engineering

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Section: Strength Under Isentropic Loadingcontrasting

confidence: 79%

“…Bat'kov et al [62] loaded AD-1 aluminum and M-1 copper isentropically to 10-15 GPa using explosive products. The difference in principal stresses was found to be 2-3 times that found for shock loading.…”

Section: Strength Under Isentropic Loadingmentioning

confidence: 99%

Strength behavior of materials at high pressures

Vogler

Chhabildas

2006

International Journal of Impact Engineering

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“…This facility will be able to generate long laser pulses (> 40 ns) at total energies approaching 2 MJ. While there is a modest body of literature for dynamic strength work below 1 Mbar [25][26][27][28] , only a handful of experiments have attempted to measure the material strength at pressures approaching 1 Mbar. [29][30][31][32] To achieve quasi-isentropic states in solids at these pressures, it is critical that the sample material remain below the melt temperature.…”

Section: Discussionmentioning

confidence: 99%

Accessing ultrahigh-pressure, quasi-isentropic states of matter

et al. 2005

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A new approach to the study of material strength of metals at extreme pressures has been developed on the Omega laser, using a ramped plasma piston drive. The laser drives a shock through a solid plastic reservoir that unloads at the rear free surface, expands across a vacuum gap, and stagnates on the metal sample under study. This produces a gently increasing ram pressure, compressing the sample nearly isentropically. The peak pressure on the sample, inferred from VISAR measurements of velocity, can be varied by adjusting the laser energy and pulse length, gap size, and reservoir density, and obeys a simple scaling relation. 1 In an important application, using in-flight x-ray radiography, the material strength of solid-state samples at high pressure can be inferred by measuring the reductions in the growth rates (stabilization) of Rayleigh-Taylor (RT) unstable interfaces. This paper reports the first attempt to use this new laser-driven, quasi-isentropic technique for determining material strength in high-pressure solids. Modulated foils of Al-6061-T6 were accelerated and compressed to peak pressures of 200 kbar. Modulation growth was recorded at a series of times after peak acceleration and well into the release phase. Fits to the growth data, using a Steinberg-Guinan (SG) constitutive strength model 2 , give yield strengths 30% greater than those given by the nominal parameters for Al-6061-T6. Calculations indicate that the dynamic enhancement to the yield strength at 200 kbar is a factor of ~2.5× over the ambient yield strength of 2.9 kbar. Experimental designs based on this drive developed for the NIF laser, predict that solid-state samples can be quasi-isentropically driven to pressures an order of magnitude higher than on Omega-accessing new regimes of dense, high-pressure matter.

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“…Recent work has shown that an FCC material loaded at a high strain-rate (but sub-shock) level, can exhibit higher strength than one loaded by a prompt shock (1)(2)(3). This experimental observation is puzzling given the state-of-the art in understanding defect generation and storage during high strain-rate versus shock loading.…”

Section: Introductionmentioning

confidence: 99%

On the Measurement of Shear-Strength in Quasi-isentropic Loading

Rosenberg¹,

Bourne²,

Gray³

et al. 2002

AIP Conference Proceedings

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It has been a subject of discussion that the rate of loading of a material determines the strength it appears to exhibit. This observation has implications for understanding and modelling the deformation mechanisms involved in high-strain rate and shock-loading. Discussion has focussed upon the response of various metals. The loading has ranged from prompt shock to pillow loads (graded density impactors) which give uniformly rising pulses over varying times. One variant upon such loading is to allow the stress to rise in steps to a final Hugoniot level which averages to a lower rate. Clearly, while the applied strain-rate during the rise in the steps is still of the same order as that in shocks, the loading is more quasi-isentropic in nature. As a means of observing the strength of a material, the lateral stress in the sample may be monitored along with the longitudinal stress therefore allowing a direct measurement (in uniaxial strain) of the difference between these two values. Potential mechanisms explaining the experimental results and comments on the interpretation of the experimental diagnostics and design is given.

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Shear strength of aluminum and copper at shockless compression

Cited by 3 publications

References 0 publications

Strength behavior of materials at high pressures

Strength behavior of materials at high pressures

Accessing ultrahigh-pressure, quasi-isentropic states of matter

On the Measurement of Shear-Strength in Quasi-isentropic Loading

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