Orientation dependence in molecular dynamics simulations of shocked single crystals |
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Authors: | Germann Holian Lomdahl Ravelo |
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Institution: | Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. |
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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. |
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