Germann TC, Holian BL, Lomdahl PS, Ravelo R
Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Phys Rev Lett. 2000 Jun 5;84(23):5351-4. doi: 10.1103/PhysRevLett.84.5351.
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.
我们使用数百万原子的分子动力学模拟来研究面心立方晶体中的冲击波传播。最近的研究表明，沿<100>方向的冲击波在足够高的冲击强度下，通过沿111密排面的滑移形成相交的堆垛层错。我们发现，在其他低指数方向传播的冲击波表现出更有趣的行为：对于<111>情况，弹性前驱波将冲击波前沿与滑移（塑性）区域分开。沿<110>方向的冲击波会产生一个领先的孤立波列，随后（在足够高的冲击速度下）是一个弹性前驱波，然后是一个复杂塑性变形区域。
