Abstract
The ignition and detonation process of non-ideal explosives is orders of magnitude different from that of ideal explosives on the time scale, which makes non-ideal explosives have a longer growth distance when subjected to shock stimulation, and the ignition growth process of non-ideal explosives is strongly dependent on external conditions, and the process involves complex physical and chemical changes of explosive materials, and today's technology cannot accurately characterize it. In order to study the ignition growth characteristics of non-ideal explosives below the critical initiation pressure, by measuring the pressure change process in the explosive inside the sample tube during the deformation stage of the shock wave sensitivity, it is found that the internal pressure of the explosive first increases and then decays. Therefore, it is judged that when the critical initiation pressure of the explosive is lower than the critical ignition pressure, the non-ideal explosive still has the next critical ignition pressure. This lower pressure can cause the ignition reaction in the non-ideal explosive to occur locally and form a pressure increase phenomenon in the explosive.
Highlights
Explosive impact initiation characteristics are usually characterized by gap experiments in the industry [1,2,3]
In the non-ideal explosive Langley method experiment, it was found that some samples were judged to be undetonated, and the steel tube filled with the sample was significantly deformed from the detonation end, but this deformation started from the detonation end and ended at the sample in the middle and lower section of the tube, the sample tube at the bottom is not deformed
Test results of internal pressure measurement. It can be seen from the above test that when the thickness of the gap is 40 mm, the sample tube begins to deform
Summary
Explosive impact initiation characteristics are usually characterized by gap experiments in the industry [1,2,3]. With the development of high-pressure testing technology [4, 5], a method of using critical initiation pressure to indicate the safety of explosives under impact has gradually emerged [6] This method obtains the critical pressure of a large number of explosive charges. In the non-ideal explosive Langley method experiment, it was found that some samples were judged to be undetonated, and the steel tube filled with the sample was significantly deformed from the detonation end, but this deformation started from the detonation end and ended at the sample in the middle and lower section of the tube, the sample tube at the bottom is not deformed This deformation process causes internal damage to the explosive. There are some reports on the impact of the damage on the explosive initiation characteristics, but there are no reports about this unconventional phenomenon
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