title: Orientation dependence in molecular dynamics simulations of shocked single crystals
abstract: We use multimillion-atom molecular dynamics simulations to study shock wave propagation in fcc crystals. As shown recently, shock waves along the <100> direction form intersecting stacking faults by slippage along 111 close-packed planes at sufficiently high shock strengths. We find even more interesting behavior of shocks propagating in other low-index directions: for the <111> case, an elastic precursor separates the shock front from the slipped (plastic) region. Shock waves along the <110> direction generate a leading solitary wave train, followed (at sufficiently high shock speeds) by an elastic precursor, and then a region of complex plastic deformation.
authors.affiliation: Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.initials: TC
authors.lastname: Germann
authors.initials: BL
authors.lastname: Holian
authors.initials: PS
authors.lastname: Lomdahl
authors.initials: R
authors.lastname: Ravelo