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
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
Laser compression of nanocrystalline tantalum
C.-H. Lu,B. A. Remington,Brian Maddox,Bimal K. Kad,H. S. Park,Megumi Kawasaki,Megumi Kawasaki,Terence G. Langdon,Terence G. Langdon,Marc A. Meyers +9 more
TL;DR: In this article, a constitutive model for the onset of twinning is applied to the shock compression configuration, based on a critical shear stress level, and the predicted threshold pressure at which the deviatoric component of stress for slip exceeds the one for twinning was calculated.
Journal ArticleDOI
Dislocation density-based modeling of subsurface grain refinement with laser-induced shock compression
Hongtao Ding,Yung C. Shin +1 more
TL;DR: In this article, a numerical framework is developed to model the evolution of dislocation density and dislocation cell size using a dislocation-based material model, which is used to predict the micro-structural evolution of metallic components subjected to single or multiple LSP impacts.
Journal ArticleDOI
Deformation and failure in extreme regimes by high-energy pulsed lasers: A review
TL;DR: The use of high-power pulsed lasers to probe the response of materials at pressures of hundreds of GPa up to several TPa, time durations of nanoseconds, and strain rates of 10 6 −10 1 ° ǫ s −1 is revealing novel mechanisms of plastic deformation, phase transformations, and even amorphization as discussed by the authors.
Journal ArticleDOI
Laser shock-induced spalling and fragmentation in vanadium
TL;DR: In this article, the spall strength of vanadium under laser loading conditions was calculated from both VISAR pull-back signals and using spall thickness, and the results indicated a strong time dependence of the phenomenon, consistent with the nucleation and growth kinetics of voids.
Journal ArticleDOI
Microstructure evolution and mechanical properties of an Mg–Gd alloy subjected to surface mechanical attrition treatment
TL;DR: In this article, the deformation process and the formation mechanism of nano grains were investigated by using transmission electron microscopy, and the results showed that twinning dominates the initial stage of the plastic deformation when the dislocation slips are obstructed.
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.