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
Citations
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Journal ArticleDOI
Size effects in fcc crystals during the high rate compression test
TL;DR: In this article, the authors studied the different mechanisms of size effects in fcc metallic samples of confined volumes during high-rate compression tests using large scale atomistic simulation and found that the controlling mechanisms depend only on the pillar size and not on the value of applied strain.
Book ChapterDOI
Chapter 89 Dislocations in Shock Compression and Release
TL;DR: In this article, the effect of polycrystallinity on the shock-wave configuration and on the defects generated is discussed, and the principal dislocation structures observed after shockwave compression are illustrated and principal mechanisms of dislocation generation are discussed, with their relative merits and limitations.
Journal ArticleDOI
Dynamic Characterization of the Postbreaking Behavior of a Nanowire
TL;DR: In this paper, the dynamic evolution of a gold nanojunction has been investigated by incorporation of molecular dynamics (MD) simulation and mechanically controllable break junction (MCBJ) in a wide range of strain rates, covering nonequilibrium, quasi-equilibrium, and equilibrium tensile states.
Journal ArticleDOI
Modelling the dynamic deformation and patterning in fcc single crystals at high strain rates: dislocation dynamics plasticity analysis
TL;DR: In this article, the deformation process in copper and aluminium single crystals under shock loading is investigated using a multiscale model of plasticity that couples discrete dislocation dynamics and finite element analyses.
Journal ArticleDOI
Nanovoid nucleation by vacancy aggregation and vacancy-cluster coarsening in high-purity metallic single crystals
TL;DR: In this paper, a numerical model to estimate critical times required for nanovoid nucleation in high-purity aluminum single crystals subjected to shock loading is presented, which is based on diffusion-mediated vacancy aggregation and subsequent vacancy cluster coarsening.
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.