PBX炸药药片的摩擦感度响应特性

Reaction Characteristics of PBX Tablet in Friction Sensitivity Test

为研究高聚物粘结炸药（PBX）在摩擦作用下的响应特性,采用药片摩擦感度试验装置分别对PBX-923和PBX-2炸药进行了试验,采用冲击波超压传感器测量了样品的反应超压,根据回收样品分析了两种炸药的响应特性,计算了摩擦作用下PBX发生点火的摩擦功阈值和摩擦功率,分析了药片摩擦感度试验中炸药的点火机制。结果表明,炸药与光滑的钢板摩擦时PBX-923炸药和PBX-2炸药的反应摩擦功分别大于515.9 J和583.2 J,摩擦功率分别大于10.12 k W和11.44 k W,而PBX-923炸药与砂靶摩擦时对应的反应摩擦功阈值为294.7~368.3 J,摩擦功率为7.80~9.75 k W,PBX-2炸药与砂靶摩擦时反应摩擦功阈值为147.3~191.5 J、摩擦功率为3.90~5.07 k W,表明摩擦作用难以整体均匀加热PBX发生点火,炸药与砂靶摩擦的点火主导机制是摩擦引发的剪切作用点火。

Friction sensitivity tests were conducted on the PBX-923 and PBX-2 tablets to study their reaction characteristics under compressed friction. The reaction overpressures of the explosive were obtained by blast pressure gauges to evaluate the reaction degree. Based on the data of overpressures and the recovered samples,reaction characteristics of these two explosives were analyzed. The ignition thresholds of friction work and corresponding friction powers were calculated and the ignition mechanism under compressed friction was analyzed. Results initially show that the ignition thresholds of friction work of PBX-923 and PBX-2 using smooth steel strip were more than 515. 9 J and 583. 2J,respectively. And the corresponding friction powers were more than 10115 W and 11435 W,respectively. They were much higher than the ignition thresholds of friction work and the corresponding friction powers using sandy abrasive strip,which were between 294. 7-368. 3 J and7. 80-9. 75 k W for PBX-923,and between 147. 3-191. 5 J and 3. 90-5. 07 k W for PBX-2,respectively. It confirms that the ignition of PBX is not directly caused by overall uniformly temperature rise during friction. Instead,shear induced ignition is probably the main ignition mechanism under compressed friction using sandy abrasive strap.