Artículo
Simulations of copper single crystals subjected to rapid shear
Higginbotham, Andrew; Bringa, Eduardo Marcial
; Marian, Jaime; Park, Nigel; Suggit, Matthew; Wark, Justin S.
Fecha de publicación:
03/2011
Editorial:
American Institute Of Physics
Revista:
Journal Of Applied Physics
ISSN:
0021-8979
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We report on nonequilibrium molecular dynamics simulations of single crystals of copper experiencing rapid shear strain. A model system, with periodic boundary conditions, which includes a single dislocation dipole is subjected to a total shear strain of close to 10% on time-scales ranging from the instantaneous to 50 ps. When the system is strained on a time-scale short compared with a phonon period, the initial total applied shear is purely elastic, and the eventual temperature rise in the system due to the subsequent plastic work can be determined from the initial elastic strain energy. The rate at which this plastic work occurs, and heat is generated, depends on the dislocation velocity, which itself is a function of shear stress. A determination of the stress-dependence of the dislocation velocity allows us to construct a simple analytic model for the temperature rise in the system as a function of strain rate, and this model is found to be in good agreement with the simulations. For the effective dislocation density within the simulations, 7.8×1011cm−27.8×1011cm−2, we find that applying the total shear strain on time-scales of a few tens of picoseconds greatly reduces the final temperature. We discuss these results in the context of the growing interest in producing high pressure, solid-state matter, by quasi-isentropic (rather than shock) compression.
Palabras clave:
Copper
,
Dislocation Dipoles
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Articulos(CCT - MENDOZA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MENDOZA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MENDOZA
Citación
Higginbotham, Andrew; Bringa, Eduardo Marcial; Marian, Jaime; Park, Nigel; Suggit, Matthew; et al.; Simulations of copper single crystals subjected to rapid shear; American Institute Of Physics; Journal Of Applied Physics; 109; 6; 3-2011; 63530-63536
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