Shear strength of aluminum upon shockless compression

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

doi:10.1007/bf02674547

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…Price et al. (2009, 2010) performed hydrocode modeling in which the yield strength of aluminum was allowed to vary according to the experimental strain rate dependence reported in Khan and Huang (1992), Bat’kov et al. (1999), and Gilat and Cheng (2002), but capped to a maximum value of 5 GPa.…”

Section: Resultsmentioning

confidence: 99%

“…Mean projectile diameter, D p ; median projectile diameter,D p ; number of projectiles measured, N p ; standard deviation of the distribution, r; and number of measurements falling outside the ranges D p ± r, D p ± 3r, and D p ± 5r, respectively. according to the experimental strain rate dependence reported in Khan and Huang (1992), Bat'kov et al (1999), and Gilat and Cheng (2002), but capped to a maximum value of 5 GPa. The resulting modeled crater dimensions were found to fit within the spread of the experimental data presented here, giving support to the hypothesis that the change in crater excavation efficiency is a strain-rate-dependent phenomenon.…”

Section: Ninementioning

confidence: 99%

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Comet 81P/Wild 2: The size distribution of finer (sub‐10 μm) dust collected by the Stardust spacecraft

Price

Kearsley

Burchell

et al. 2010

Meteorit & Planetary Scien

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Abstract-The fluence of dust particles <10 lm in diameter was recorded by impacts on aluminum foil of the NASA Stardust spacecraft during a close flyby of comet 81P ⁄ Wild 2 in 2004. Initial interpretation of craters for impactor particle dimensions and mass was based upon laboratory experimental simulations using projectiles less than >10 lm in diameter and the resulting linear relationship of projectile to crater diameter was extrapolated to smaller sizes. We now describe a new experimental calibration program firing very small monodisperse silica projectiles (470 nm-10 lm) at approximately 6 km s )1. The results show an unexpected departure from linear relationship between 1 and 10 lm. We collated crater measurement data and, where applicable, impactor residue data for 596 craters gathered during the postmission preliminary examination phase. Using the new calibration, we recalculate the size of the particle responsible for each crater and hence reinterpret the cometary dust size distribution. We find a greater flux of small particles than previously reported. From crater morphology and residue composition of a subset of craters, the internal structure and dimensions of the fine dust particles are inferred and a ''maximumsize'' distribution for the subgrains composing aggregate particles is obtained. The size distribution of the small particles derived directly from the measured craters peaks at approximately 175 nm, but if this is corrected to allow for aggregate grains, the peak in subgrain sizes is at <100 nm.

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Section: Resultsmentioning

confidence: 99%

Section: Ninementioning

confidence: 99%

Comet 81P/Wild 2: The size distribution of finer (sub‐10 μm) dust collected by the Stardust spacecraft

Price

Kearsley

Burchell

et al. 2010

Meteorit & Planetary Scien

View full text Add to dashboard Cite

show abstract

“…The technique has also been useful for studying dynamic phase transitions and optical properties [24][25][26] because of its sensitivity to small changes in material response and ability to obtain material properties continuously over a range of pressures. Use of the technique for determining mechanical properties, such as flow strength at high loading stresses, is limited to a few materials 18,[27][28][29][30][31][32][33][34] and has involved different diagnostic methods for deducing strength. A difficulty in extracting strength information from data on longitudinal stress produced by ramp compression is that these measurements do not provide direct information about the deviator stresses underlying flow strength properties.…”

Section: Introductionmentioning

confidence: 99%

Yield strength of tantalum for shockless compression to 18 GPa

Asay

Vogler

et al. 2009

Journal of Applied Physics

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Effect of temperature, strain, and strain rate on the flow stress of aluminum under shock-wave compression J. Appl. Phys. 112, 073504 (2012); 10.1063/1.4755792Comparative studies of yield strength and elastic compressibility between nanocrystalline and bulk cobalt Modeling of the elastic precursor behavior and dynamic inelasticity of tantalum under ramp wave loading to 17 GPa A magnetic loading technique was used to study the strength of pure, annealed, and cold-rolled polycrystalline tantalum under planar ramp loading at strain rates of ϳ10 6 / s. Both the initial yield strength and the flow strength after compression to peak loading stresses of 18 GPa were determined. For sample thicknesses ranging from 0.5-6.0 mm, it was found that the elastic limit of ϳ3.2 GPa, corresponding to a yield strength of 1.6 GPa, for annealed Ta was sharply defined and essentially independent of sample thickness. After elastic yielding, relaxation of the longitudinal stress occurred for sample thicknesses greater than ϳ0.5 mm, approaching an asymptotic value of ϳ1.6 GPa. Two different purities of annealed Ta showed no difference in initial yield strength. Cold-rolling annealed Ta to 26% plastic strain resulted in a more dispersed elastic precursor with an amplitude of about 1.6 GPa and with no stress relaxation after yielding. Analysis of unloading wave profiles from the peak loading states allowed determination of the flow stress, which increased to about 0.9 GPa for annealed Ta and 1.3 GPa for cold-rolled Ta at peak stresses of 17-18 GPa.

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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 upon shockless compression

Cited by 6 publications

References 2 publications

Comet 81P/Wild 2: The size distribution of finer (sub‐10 μm) dust collected by the Stardust spacecraft

Comet 81P/Wild 2: The size distribution of finer (sub‐10 μm) dust collected by the Stardust spacecraft

Yield strength of tantalum for shockless compression to 18 GPa

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

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