Journal ArticleDOI
The strength of single crystal copper under uniaxial shock compression at 100 GPa
William J. Murphy,Andrew Higginbotham,Giles Kimminau,B. Barbrel,Eduardo M. Bringa,James Hawreliak,Ryosuke Kodama,M. Koenig,W McBarron,Marc A. Meyers,Bob Nagler,Norimasa Ozaki,Nigel Park,Bruce Remington,S. Rothman,Sam Vinko,T. Whitcher,Justin Wark +17 more
TLDR
It is inferred, using molecular dynamics simulations and VISAR (standing for 'velocity interferometer system for any reflector') measurements, that the strength of the material increases dramatically (to approximately 1 GPa) for these extreme strain rates.Abstract:
In situ x-ray diffraction has been used to measure the shear strain (and thus strength) of single crystal copper shocked to 100 GPa pressures at strain rates over two orders of magnitude higher than those achieved previously. For shocks in the [001] direction there is a significant associated shear strain, while shocks in the [111] direction give negligible shear strain. We infer, using molecular dynamics simulations and VISAR (standing for 'velocity interferometer system for any reflector') measurements, that the strength of the material increases dramatically (to ~1 GPa) for these extreme strain rates.read more
Citations
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Fast parallel algorithms for short-range molecular dynamics
TL;DR: Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems.
Journal ArticleDOI
Femtosecond visualization of lattice dynamics in shock-compressed matter.
Despina Milathianaki,Sébastien Boutet,Garth J. Williams,Andrew Higginbotham,Daniel Ratner,A. E. Gleason,Marc Messerschmidt,M. Marvin Seibert,M. Marvin Seibert,Damian Swift,Ph. Hering,Joseph Robinson,William E. White,Justin Wark +13 more
TL;DR: Femtosecond x-ray diffraction measurements unveil the response of copper to laser shock-compression at peak normal elastic stresses of ~73 gigapascals (GPa) and strain rates of 109 per second, and capture the evolution of the lattice from a one-dimensional elastic to a 3D plastically relaxed state within a few tens of picoseconds.
Journal ArticleDOI
A dislocation-based multi-rate single crystal plasticity model
TL;DR: In this paper, an elastic-viscoplastic, slip-based single crystal model that accounts for crystallographic orientation, temperature, and strain rate dependence has been formulated based on dislocation dynamics simulations and existing experimental data.
Journal ArticleDOI
The Matter in Extreme Conditions instrument at the Linac Coherent Light Source
Bob Nagler,Brice Arnold,Gary Bouchard,Richard F. Boyce,Richard M. Boyce,Alice Callen,Marc Campell,Ruben Curiel,Eric Galtier,Justin Garofoli,Eduardo Granados,J. B. Hastings,G. Hays,Philip Heimann,Richard W. Lee,Despina Milathianaki,Lori Plummer,A. Schropp,Alex Wallace,Marc Welch,William E. White,Zhou Xing,Jing Yin,James Young,Ulf Zastrau,Hae Ja Lee +25 more
TL;DR: A description of the Matter in Extreme Conditions instrument at the Linac Coherent Light Source is given and recent scientific highlights illustrate phase-contrast imaging of shock waves, X-ray Thomson scattering andX-ray diffraction of shocked materials.
Journal ArticleDOI
The Use of Particle/Substrate Material Models in Simulation of Cold-Gas Dynamic-Spray Process
Saeed Rahmati,A. Ghaei +1 more
TL;DR: In this paper, the performance of different material models in simulation of cold spray process was compared and the results showed that the material model had a considerable effect on the predicted deformed shapes.
References
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Journal ArticleDOI
Fast parallel algorithms for short-range molecular dynamics
TL;DR: In this article, three parallel algorithms for classical molecular dynamics are presented, which can be implemented on any distributed-memory parallel machine which allows for message-passing of data between independently executing processors.
Fast parallel algorithms for short-range molecular dynamics
TL;DR: Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems.
Journal ArticleDOI
Structural stability and lattice defects in copper: Ab initio , tight-binding, and embedded-atom calculations
TL;DR: In this article, the ability of the embedded-atom method (EAM) and the tight-binding (TB) method to predict reliably energies and stability of nonequilibrium structures by taking Cu as a model material was evaluated.
Journal ArticleDOI
Laser interferometer for measuring high velocities of any reflecting surface
Lynn M. Barker,R. E. Hollenbach +1 more
TL;DR: In this article, a laser velocity interferometer instrumentation system was developed which can measure the velocity history of either spectrally or diffusely reflecting surfaces, and achieved accuracies of 2% or better for peak surface velocities of 0.2 mm/μsec.