压装HMX基PBX老化损伤及力学环境适应性

Aging Damage and Mechanical Environment Adaptability of Pressed HMX-Based PBX

研究弹药装药的长贮老化损伤及力学环境适应性,用计算机断层成像(CT扫描)观察了贮存4,8,12a的压制奥克托今(HMX)基高聚物粘结炸药(PBX)装药的宏观结构缺陷。采用扫描电子显微镜(SEM)分析了贮存4,12a装药的细观损伤。运用冲击、振动实验考核了贮存12a装药的力学环境适应性。结果表明,长贮后出现PBX装药缺陷,表现为较为平直的沿径向贯穿、沿周向分布较为均匀的裂纹,裂纹数量随贮存年限增加而增加。装药缺陷的细观损伤模式为界面脱粘及基体开裂。带缺陷PBX装药弹药经受一定的冲击及振动载荷后,虽然增加了两处径向裂纹,但能够保证安全。

To investigate the long-term storage aging damage and mechanical environment adaptability of ammunition charge,the macroscopic structure defects of the pressed HMX-based polymer bonded explosive（PBX） charge stored for 4, 8 and 12 years were observed by computerized tomography（CT scanning）. The micro damage of the charge stored for 4 and 12 years was analyzed by scanning electron microscope（SEM）. The mechanical environment adaptability of the charge stored for 12 years was examined by impact and vibration tests. Results indicate that the defects of PBX charge occur after long-term storage. The defects are expressed as relatively straight cracks penetrated along the radial direction and circumferential uniform distribution. The crack number increa- ses with the increase of storage period. The micro damage model of charge defects is the interface debonding and matrix cracking. After certain loading subjected to impact and vibration, the 2 charge cracks are increased, but PBX charge ammunition with defect can ensure to be safe.