INVESTIGADORES
BRINGA Eduardo Marcial
artículos
Título:
Shock Compression of Monocrystalline Copper: Atomistic Simulations
Autor/es:
B.Y. CAO; E.M. BRINGA; M.A. MEYERS
Revista:
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2007 vol. 38 p. 2681 - 2688
ISSN:
1073-5623
Resumen:
Molecular dynamics (MD) simulations were used to model the effects of
shock compression on [001] and [221] monocrystals. We
obtained the Hugoniot for both directions, and analyzed the
formation of a two-wave structure for the [221] monocrystal. We
also analyzed the dislocation structure induced by the shock
compression along these two crystal orientations. The topology
of this structure compares extremely well with that observed in
recent transmission electron microscopy (TEM) studies of shock-induced
plasticity in samples recovered from flyer plate and laser
shock experiments. However, the density of stacking faults in our
simulations is 102 to 104 times larger
than in the experimental observations of recovered samples. The
difference between experimentally observed TEM
and calculated MD results is attributed to two effects: (1) the
annihilation of dislocations during post-shock relaxation
(including unloading) and recovery processes and (2) a much
shorter stress rise time at the front in MD (<1 ps) in comparison
with flyer-plate shock compression (∼1 ns).