Laser-induced shock compression of monocrystalline copper: characterization and analysis

Meyers, Marc A.; Grégori, Fabienne; Kad, Bimal K.; Schneider, M.; Kalantar, D. H.; Remington, B. A.; Ravichandran, G.; Boehly, T. R.; Wark, J. S.

doi:10.1016/s1359-6454(02)00420-2

Cited by 258 publications

(152 citation statements)

References 21 publications

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“…The homogeneous loop nucleation model [19,49] for shock compression was applied to the transition between cells and stacking-fault packets: this mechanism proposes that shear loops are nucleated at the shock front and that this may be a thermally activated process. Experimental results and analysis of loops support this mechanism.…”

Section: Resultsmentioning

confidence: 99%

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Deformation Substructures and Their Transitions in Laser Shock–Compressed Copper-Aluminum Alloys

Meyers

Schneider

Jarmakani

et al. 2007

Metall Mater Trans A

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It is shown that the short pulse durations (0.1-10 ns) in laser shock compression ensure a rapid decay of the pulse and quenching of the shocked sample in times that are orders of magnitude lower than in conventional explosively driven plate impact experiments. Thus, laser compression, by virtue of a much more rapid cooling, enables the retention of a deformation structure closer to the one existing during shock. The smaller pulse length also decreases the propensity for localization.

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Section: Resultsmentioning

confidence: 99%

“…The upper bound was taken from dynamic yield strength measurements of Meyers [19]. The saturation strength, σ u , and work hardening rate, β, were held constant at 680 MPa and 0.45 respectively except for the highest yield strength simulation where the values 950 MPa and 0.45 were chosen.…”

Section: Hydrodynamic Simulationsmentioning

confidence: 99%

Deformation Substructures and Their Transitions in Laser Shock–Compressed Copper-Aluminum Alloys

Meyers

Schneider

Jarmakani

et al. 2007

Metall Mater Trans A

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“…Lasers are unraveling a new frontier in materials under extreme regimes of shock compression Both of the flyer-plate impact [25] and laser [26] techniques have recently been employed to explore the post-shocked microstructures of monocrystalline copper.…”

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confidence: 99%

Effect of shock compression method on the defect substructure in monocrystalline copper

Cao

Lassila

Schneider

et al. 2005

Materials Science and Engineering: A

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Monocrystalline copper samples with orientations of [001] and [221] were shocked at pressures ranging from 20 GPa to 60 GPa using two techniques: direct drive lasers and explosively driven flyer plates. The pulse duration for these techniques differed substantially: 40 ns for the laser experiments at 0.5 mm into the sample and 1.1 ~1.4 µs for the flyer-plate experiments at 5 mm into the sample. The residual microstructures were dependent on orientation, pressure, and shocking method. The much shorter pulse duration in the laser driven shock yielded microstructures closer to the ones generated at the shock front. For the flyer-plate experiments, the longer pulse duration allows shockgenerated defects to reorganize into lower energy configurations. Calculations show that the post-shock cooling for the laser driven shock is 10 3 ~ 10 4 faster than that for plateimpact shock, propitiating recovery and recrystallization conditions for the latter. At the higher pressure level, extensive recrystallization was observed in the plate-impact samples, while it was absent in the laser driven shock. An effect that is proposed to contribute significantly to the formation of recrystallized regions is the existence of micro-shear-bands, which increase the local temperature beyond the prediction from adiabatic compression.

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“…1 It is known that the yield stress of the material, defined as the shear stress reached before any dislocations are nucleated in the material, increases with increasing strain rate. [2][3][4][5] Experimentally, it is hard to get data at these high strain rates, not because they cannot be achieved, but because the measurement of strength at such high strain rates (and thus short time scales) is difficult. 6,7 Dynamic strength has been indirectly inferred from its role in inhibiting the growth of Rayleigh-Taylor [8][9][10][11][12][13] and Richtmyer-Meshkov 14 instabilities.…”

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confidence: 99%

“…A few impact and shock experiments have been exploring increasingly high strain rates, [3][4][5] and recently the strength of copper at a strain rate of 10 10 s -1 has been measured. 15 Molecular Dynamics (MD) simulations offer the unique advantage that the conditions of the simulation can be controlled very precisely, and at the same time, the atomistic behavior of the material can be observed at any moment and at any location in the sample.…”

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Strain rate and orientation dependencies of the strength of single crystalline copper under compression

Dupont

Germann

2012

Phys. Rev. B

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Molecular Dynamics (MD) simulations are used to model the compression under uniaxial strain of copper single crystals of different orientations at various temperatures and strain rates. Uniaxial strain is used because of the close resemblance of the resulting stress state with the one behind a shock front, while allowing a control of parameters such as strain rate and temperature to better understand the behavior under complex dynamic shock conditions. Our simulations show that for most orientations, the yield strength of the sample is increased with increasing strain rate. This yield strength is also dependent on the orientation of the sample, but less dependent on temperature. We find three regimes for the atomistic behavior around the yield: homogeneous dislocation nucleation, appearance of disordered atoms followed by dislocation nucleation, and amorphization. Finally, we show that a criterion solely based on a critical resolved shear and normal stress is insufficient at these strain rates to determine slip on a system.

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Laser-induced shock compression of monocrystalline copper: characterization and analysis

Cited by 258 publications

References 21 publications

Deformation Substructures and Their Transitions in Laser Shock–Compressed Copper-Aluminum Alloys

Deformation Substructures and Their Transitions in Laser Shock–Compressed Copper-Aluminum Alloys

Effect of shock compression method on the defect substructure in monocrystalline copper

Strain rate and orientation dependencies of the strength of single crystalline copper under compression

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