PBX颗粒力学性质对其撞击感度影响的初步研究

利用自行研制的应力测试系统研究了在机械撞击作用下粉状塑料粘结炸药(PBX)的表现。结果表明,由不同的聚氨酯(PU)溶液处理黑索今(RDX)得到的混和炸药PU-RDX,在机械撞击作用下给出的应力-时间曲线是多样的。而且PU-RDX的机械撞击感度随出现第二个应力峰的时间比(指不同的PU-RDX第二应力峰出现时间和仪器在空打时相应时间比)的增大,有下降的趋势。该时间比在一定程度上代表了粉状PU-RDX的塑性。研究在机械撞击作用下PBX的应力-时间特性有助于理解钝感炸药的机理、改进有关的工艺。

PRIMARY INVESTIGATION ON THE INFLUENCE OF MECHANICAL PROPERTIES OF POWDERED PBX UPON ITS IMPACT SENSITIVITY

The stress-time behaviour of powdered plastic-bounded explosive (PBX) under mechanical impact was studied using a stress-test system developed in our laboratory. The results of investigation illustrate that PU-RDX(crystals of RDX were coated by polyurethane film from various polyurethane solution respectively in preparing PBX) may have quite different forms of stress-time curve under impact. Meanwhile the impact sensitivity of PU-RDX changes with the ratio of the time(the second peak arising time on stress-time curve of RDX with PU to that of without it). With the increase of this ratio the impact sensitivity of PU-RDX reduces. In some extent, this ratio represents the plasticity of the powdered PU-RDX Studying the properties of stress-time curve of various PU-RDX is helpful for investigating the mechanism of desensitization of explosive and may improve the technology of preparation.