药片剪切试验中PBX-2炸药的响应特性

Response Character for PBX-2 Explosive in Shear Test

采用ANSYS/LS-DYNA有限元计算程序模拟设计了药片剪切试验装置,研究了Φ20 mm×5 mm和Φ20 mm×9 mm两种厚度的PBX-2药片在剪切试验中的响应特性。采用锰铜压力计测试样品中压力的变化过程,通过高速录像照片分析了撞击点火反应过程,用冲击波超压传感器测量了炸药的反应超压,综合分析了PBX-2炸药在药片剪切试验中的响应规律。结果初步表明,药片剪切试验中PBX-2炸药厚度由5 mm变化至9 mm,其反应落高阈值由3.5～3.7 m降低为3.0～3.1 m,即随着该炸药厚度增加,其反应落高阈值略有降低。

The shear device for explosive tablet was designed by ANSYS/LS-DYNA and the response character was studied using Φ20 mm×5 mm and Φ20 mm×9 mm PBX-2. The pressure change was measured by Manganin pressure gauges. Ignition process was analyzed by high-speed motion pictures. The reaction overpressure of explosive was gained by blast pressure gauges. Results preliminary show that height threshold decreases from 3.5～3.7 m to 3.0～3.1 m with explosive thickness increasing. The height threshold decreases when increasing explosive thickness in shear test for explosive tablet.