Journal ArticleDOI
Laser-induced shock compression of monocrystalline copper: characterization and analysis
Marc A. Meyers,Fabienne Grégori,Bimal K. Kad,M. S. Schneider,Daniel H. Kalantar,Bruce Remington,Guruswami Ravichandran,T. R. Boehly,Justin Wark +8 more
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TLDR
In this paper, a method for estimating dislocation densities is proposed, based on nucleation of loops at the shock front and their extension due to residual shear stresses behind the front.About:
This article is published in Acta Materialia.The article was published on 2003-03-14. It has received 219 citations till now. The article focuses on the topics: Slip (materials science) & Crystal twinning.read more
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A dislocation-based constitutive model for viscoplastic deformation of fcc metals at very high strain rates
Ryan A. Austin,David L. McDowell +1 more
TL;DR: In this article, a physically-based model is developed to address slip in polycrystalline metals and alloys subjected to very high rates of deformation (104−108 s−1).
Journal ArticleDOI
Shock deformation of face-centred-cubic metals on subnanosecond timescales
Eduardo M. Bringa,K. Rosolankova,Robert E. Rudd,B. A. Remington,Justin Wark,Mark A. Duchaineau,Daniel H. Kalantar,James Hawreliak,James Belak +8 more
TL;DR: Large-scale molecular dynamics simulations of shock-wave propagation through a metal allowing a detailed analysis of the dynamics of high strain-rate plasticity resolve the important discrepancy in the evolution of the strain from one- to three-dimensional compression observed in diffraction experiments.
Journal ArticleDOI
Atomistic Shock Hugoniot simulation of single-crystal copper
Eduardo M. Bringa,J. U. Cazamias,Paul Erhart,James S. Stolken,N. Tanushev,Brian D. Wirth,Robert E. Rudd,Maria Jose Caturla +7 more
TL;DR: In this article, a simulation of single-crystal copper was performed using nonequilibrium molecular dynamics with a realistic embedded atom potential, and the simulation results were in good agreement with new experimental data presented here.
Journal ArticleDOI
High-velocity deformation of Al 0.3 CoCrFeNi high-entropy alloy: Remarkable resistance to shear failure
TL;DR: It is proposed that the excellent strain hardening ability gives rise to remarkable resistance to shear localization, which makes this material an excellent candidate for penetration protection applications such as armors.
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Mechanisms of nanostructure and metastable phase formations in the surface melted layers of a HCPEB-treated D2 steel
TL;DR: In this article, the authors investigated the mechanism of surface modification associated with the high-current pulsed electron beam (HCPEB) treatment of a D2 steel with increasing numbers of pulses.
References
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Book
Dynamic Behavior of Materials
TL;DR: In this paper, the authors present a method to produce dynamic deformation at high strain rates by using Shear Bands (Thermoplastic Shear Instabilities) and dynamic fracture.
Journal ArticleDOI
Dislocation-mechanics-based constitutive relations for material dynamics calculations
TL;DR: An improved description of copper and ironcylinder impact (Taylor) test results has been obtained through the use of dislocation-mechanics-based constitutive relations in the Lagrangian material dynamics computer program EPIC•2.
Journal ArticleDOI
The onset of twinning in metals: a constitutive description
TL;DR: In this article, a constitutive expression for the twinning stress in BCC metals is developed using dislocation emission from a source and the formation of pile-ups, as rate-controlling mechanism.
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Dislocation nucleation from a crack tip : an analysis based on the Peierls concept
TL;DR: In this paper, a periodic relation between shear stress and atomic shear displacement is assumed to hold along the most highly stressed slip plane emanating from a crack tip, which allows some small slip displacement to occur near the tip in response to small applied loading and, with increase in loading, the incipient dislocation configuration becomes unstable and leads to a fully formed dislocation which is driven away from the crack.
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The size of a dislocation
TL;DR: In this paper, the size of a dislocation and critical shear stress for its motion were calculated for a single dislocation with respect to the size and motion of the dislocation.