炸药冲击损伤的实验研究

Experimental Study on the Impact Damage of Selected Explosives

采用低速气炮对B炸药和PBXN 5高聚物粘结炸药进行冲击损伤加载。通过控制弹速对试样进行不同程度的损伤,同时记录冲击加载过程中应力变化过程。对冲击损伤形貌进行显微观察,同时对冲击损伤前后试样密度和声衰减进行测量。结果表明,B炸药和PBXN 5炸药均表现出脆性材料的损伤特征,但其材料组成上的不同也导致了二者损伤特征有所差异。

The study of damage mechanisms and its evolution of explosives is of great importance for the safety evaluation of explosive materials. A longpulse lowvelocity gas gun with a gas buffer was used to impact explosive samples. The explosives used include cast Comp. B and hot pressed PBXN5. Different projectile velocities were used to achieve different damage degree in samples and the stress history of samples in the process of dynamic loading was recorded. The microstructure of samples before and after impact were studied by use of Scanning Microscopy (SEM) and Polarized Light Microscopy (PLM). In addition, the density and ultrasonic wave attenuation of samples before and after impact loading were examined. The results show that both Comp. B and PBXN5 exhibit similar damage characteristics of brittle materials. However, due to the difference in compositions, Comp. B and PBXN5 also exhibit different damage characteristics.