环三亚甲基三硝胺（RDX）受电冲击的保压响应
Pressure-Thresholded Response in Cylindrically Shocked Cyclotrimethylene Trinitramine (RDX)
摘要：
我们证明了一个强烈的阈值响应环三亚甲基三硝胺（RDX）时，它是圆柱形冲击使用一种新的波导几何形状。使用超快单次激发多帧成像，我们证明了嵌入聚合物主体中的直径<100 μm的RDX单晶在冲击首次到达晶体后沿优先面变形>100 ns。我们使用原位成像和时间分辨光电子能谱来证明，短暂的化学发生复杂的变形途径。使用扫描电子显微镜和超小角X射线散射，我们证明了冲击引起的动力学留下多孔晶体，与孔的形状和大小的变化显着的冲击能量。在会聚中心处的~ 12 GPa的阈值压力将单模平面晶体变形与较高压力下的化学耦合多平面动力学分离。我们的观察表明我们的圆柱形冲击系统的变形的优先方向，尽管沿许多不同的晶面施加的应力。
英文摘要：
We demonstrate a strongly thresholded response in cyclotrimethylene trinitramine (RDX) when it is cylindrically shocked using a novel waveguide geometry. Using ultrafast single-shot multi-frame imaging, we demonstrate that <100-μm diameter single crystals of RDX embedded in a polymer host deform along preferential planes for >100 ns after the shock first arrives in the crystal. We use in-situ imaging and time-resolved photoemission to demonstrate that short-lived chemistry occurs with complex deformation pathways. Using scanning electron microscopy and ultrasmall-angle X-ray scattering, we demonstrate that the shock-induced dynamics leave behind porous crystals, with pore shapes and sizes that change significantly with shock energy. A threshold pressure of ~ 12 GPa at the center of convergence separated the single-mode planar crystal deformations from the chemistry-coupled multi-plane dynamics at higher pressures. Our observations indicate preferential directions for deformation for our cylindrically shocked system, despite the applied stress along many different crystallographic planes.
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