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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Phase Transformation in Tantalum under Extreme Laser Deformation
TL;DR: The formation of a hexagonal (omega) phase was observed in recovered monocrystalline body-centered cubic tantalum of four crystallographic orientations subjected to an extreme regime of pressure, temperature, and strain-rate using high-energy pulsed lasers.
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A mesoscale investigation of strain rate effect on dynamic deformation of single-crystal copper
Zhanli Liu,X. C. You,Zhuo Zhuang +2 more
TL;DR: In this paper, a combined finite element simulation and discrete dislocation dynamics (DD) approach was developed to investigate the dynamic deformation of single-crystal copper at mesoscale.
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A dislocation-based constitutive description for modeling the behavior of FCC metals within wide ranges of strain rate and temperature
TL;DR: In this paper, a dislocation-based constitutive description for modeling the thermo-viscoplastic behavior of FCC metals has been developed, which is based on the concepts of thermal activation analysis and dislocation dynamics, assuming the plastic flow additively decomposed into internal stress and effective stress.
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A modified Johnson-Cook material model with strain gradient plasticity consideration for numerical simulation of cold spray process
Rohan Chakrabarty,Jun Song +1 more
TL;DR: In this article, a modified form of the Johnson-Cook model was developed to account for the viscous regimes experienced at high strain rates, which takes a simple mathematical form with less adjustable material parameters than previous modifications of the JC model.
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On the homogeneous nucleation and propagation of dislocations under shock compression
TL;DR: In this paper, multiscale dislocation dynamics plasticity (MDDP) calculations are carried out to simulate the mechanical response of copper reported at ultra-high strain rates shock loading, and the value of threshold stress for homogeneous nucleation obtained from elastodynamic solution and standard nucleation theory with MDDP predictions for copper single crystals oriented in the [0 0 1].
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.
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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.