Pressure-Thresholded Response in Cylindrically Shocked Cyclotrimethylene Trinitramine (RDX).,The Journal of Physical Chemistry A

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Pressure-Thresholded Response in Cylindrically Shocked Cyclotrimethylene Trinitramine (RDX).
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2020-04-15 , DOI: 10.1021/acs.jpca.9b07637
Leora E Dresselhaus-Cooper _{1,

2} , Dmitro J Martynowych _{1,

2} , Fan Zhang ₃ , Charlene Tsay ₄ , Jan Ilavsky ₅ , SuYin Grass Wang ₆ , Yu-Sheng Chen ₆ , Keith A Nelson _{1,

2}

Affiliation

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 ultra-small-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 pressure. 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 in our cylindrically shocked system, despite the applied stress along many different crystallographic planes.

中文翻译：

圆柱冲击环三亚甲基三硝胺（RDX）的压力阈值响应。

我们证明了环三亚甲基三硝胺（RDX）在使用新型波导几何结构受到圆柱冲击时的强烈阈值响应。使用超快速单发多帧成像，我们证明了在冲击首先到达晶体后，嵌入聚合物主体中的直径小于100μm的RDX单晶会沿优先平面变形> 100 ns。我们使用原位成像和时间分辨的光发射来证明短暂的化学反应具有复杂的变形途径。使用扫描电子显微镜和超小角度X射线散射，我们证明了由震动引起的动力学过程留下了多孔晶体，其孔的形状和大小随冲击压力而显着变化。会聚中心处约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开。我们的观察结果表明，尽管沿许多不同的晶面施加了应力，但在我们的圆柱振动系统中，变形的优先方向仍然存在。

更新日期：2020-04-24

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