Year: 2009
Type: conference-paper
Abstract: We have performed large‐scale molecular‐dynamics (MD) simulations of shock loading and quasi‐isentropic compression in defective copper crystals, modeling the interatomic interactions with an embedded‐atom method potential. For samples with a relatively low density of pre‐existing defects, the strain rate dependence of the flow stress follows a power law in the 109–1012 s−1 regime with an exponent of 0.40. For initially damaged, isotropic crystals the flow stress exhibits a narrow linear region in strain rate, which then bends over at high strain rates in a manner reminiscent of shear thinning in fluids. The MD results can be described by a modification of Eyring’s theory of Couette shear flow in fluids.
Source: AIP conference proceedings
DOI: 10.1063/1.3295269
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Funder: U.S. Department of Energy
OpenAlex ID: W1976441443