Experimental measurement of energy release from an initiating layer in an insensitive explosive
Experimental measurement of energy release from an initiating layer in an insensitive explosive
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钝感炸药起爆层能量释放的实验测量
DOI：
10.1016/j.proci.2020.07.150
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发表时间：
2020
影响因子：
3.4
通讯作者：
S. Jackson
中科院分区：
文献类型：
--
作者：
E. Anderson;C. Chiquete;S. Jackson
当受到强度不足以触发迅速反应的冲击时，非均相凝聚相炸药可形成其中大量炸药保持未反应的时间远大于引爆炸药的反应时间的区域。这种现象被观察到的炸药PBX 9502（95重量% TATB）的平面和斜输入冲击。在这项工作中，我们建立在以前的结果进行圆柱体膨胀（CYLEX）测试，炸药是由一个更快的核心PBX 9501（95重量%的HMX）内的PBX 9502较慢的环。在较快的PBX 9501中的爆炸将斜激波驱动到相邻的PBX 9502中，并且产生环形横向引发层（IL）。在测试几何结构中，IL在短距离运行后稳定地沿测试长度向下行进。在IL之外的径向位置处，观察到引爆PBX 9502的环形区域。使用标准的CYLEX测试诊断，我们推断该实验的总能量释放。通过假设（1）组合的能量释放由来自引爆PBX 9501、引爆PBX 9502和PBX 9502中的IL的贡献组成，以及（2）引爆炸药的质量比能量释放与通常观察到的每种炸药的质量比能量释放大致相同，可以计算IL能量释放和反应效率。结果与类似几何形状的先前结果进行了比较，结果表明，虽然减震PBX 9502不会立即引爆，但它最终会在10 µs量级的较长时间内释放出相当大一部分化学势能。
When subjected to a shock of insufficient strength to trigger prompt reaction, heterogenous condensed phase explosives can form regions where significant amounts of the explosive remain unreacted for times much greater than the reaction time of the detonating explosive. This phenomena is observed for the explosive PBX 9502 (95 wt% TATB) both for planar and oblique input shocks. In this work, we build on previous results by performing cylinder expansion (CYLEX) tests where the explosive charge is comprised of a faster core of PBX 9501 (95 wt% HMX) inside a slower annulus of PBX 9502. The detonation in the faster PBX 9501 drives an oblique shock into the adjacent PBX 9502, and an annular transverse initiating layer (IL) results. In the test geometry, the IL travels steadily down the length of the test after a short run distance. At radial positions beyond the IL, an annular region of detonating PBX 9502 is observed. Using standard CYLEX test diagnostics, we infer the total energy release of this experiment. By making the assumptions that (1) the combined energy release is comprised of contributions from detonating PBX 9501, detonating PBX 9502, and the IL in the PBX 9502 and (2) mass-specific energy release for the detonating explosives is approximately the same as typically observed for each explosive, the IL energy release and reaction efficiency can be computed. Results are compared to prior results for a similar geometry, and indicate that while shock deadened PBX 9502 does not detonate promptly, it does eventually release a significant portion of its chemical potential energy over longer timescales on the order of 10 µs.