炸药殉爆实验和数值模拟

为解决炸药殉爆实验可以给出炸药殉爆条件,但不能得到炸药爆炸过程细节的问题,进行了固黑铝(GHL)炸药殉爆实验,通过观测残留炸药和见证板变形,判断被发炸药爆炸情况. 并采用非线性有限元计算方法对炸药殉爆实验进行了数值模拟计算. 计算模型中主要考虑了主发炸药爆炸冲击波在空气中的传播及其对被发炸药的冲击起爆. 用欧拉法描述主发炸药及周围空气介质,用拉格朗日法描述被发炸药和见证板. 通过数值模拟计算,分析了炸药殉爆过程中,被发炸药爆轰波的成长历程. 结果表明:被发炸药起爆点位于药柱下端,爆轰波先向下传播,使底部炸药先爆炸,然后转为向上传播起爆整个炸药柱;炸药底端压力不高,远低于炸药C-J爆压,对见证板的破坏作用较小.

Experiment & Simulation of Sympathetic Detonation Tests

Conditions of sympathetic detonation can be obtained from the experiment of sympathetic detonation tests, while the details of sympathetic detonation progress can not be reached. Sympathetic detonation experiments of GHL explosive were carried out. By observation of the witness and remanent explosives, the explosive reaction state was judged. Numerical simulations of sympathetic detonation were conducted with non-linear finite element method. The model considered the effects of shock waves produced by donor and acted on the acceptor. The donor and ambient air were described in Euler algorithm while the acceptor and witnesses were in Lagrange algorithm. Histories in the sympathetic detonation reaction of the acceptor were analyzed. The results indicated that the initiation point was at the underside of the acceptor. Detonation waves transmitted down first, so that the underside of the explosive initiated first, and then upward to detonate the explosives column. The pressure of explosive bottom was much lower than the C-J detonation pressure and the damage of witness was relatively small.