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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Pressure-Thresholded Response in Cylindrically Shocked Cyclotrimethylene Trinitramine (RDX)
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Pressure-Thresholded Response in Cylindrically Shocked Cyclotrimethylene Trinitramine (RDX)

机译:圆柱形震动环烷基三腈(RDX)中的压力阈值响应

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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 mu m 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 similar to 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.
机译:当使用新的波导几何形状圆柱形震动时,我们证明了在环基三亚甲基三硝胺(RDX)中的强烈阈值反应。使用超快单次多帧成像,我们证明了在撞击首先到达晶体之后,嵌入聚合物主体中的RDX的<100μm直径的RDX的单晶沿> 100ns的优先平面变形。我们使用原位成像和时间解决的光曝光,以证明具有复杂变形途径的短寿命化学。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,孔隙形状和尺寸随着冲击压力而显着变化。在收敛中心处的阈值压力与12GPa相似,在更高的压力下将单模平面晶体变形分离在化学耦合的多平面动态。我们的观察结果表明,尽管沿着许多不同的晶粒施加的应力,但是在我们的圆柱震动系统中的优先方向是在我们的圆柱震动系统中的变形。

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