中文摘要：

为了研究常温和75℃条件下PBX-2炸药射弹撞击响应特性,采用高温撞击试验装置对PBX-2炸药进行了射弹撞击试验。采用冲击波超压传感器测量了炸药的反应超压,结合回收样品综合分析了常温和75℃下炸药的响应特性。采用有限元程序LS-DYNA计算分析了不同撞击速度对应的常温和75℃PBX-2炸药的受力变化。结果表明,常温下PBX-2炸药撞击点火反应速度阈值为263.5~269.9m·s~（-1）;加热至75℃时,PBX-2炸药撞击点火反应速度阈值为316~367m·s~（-1）。相比常温状态,当射弹撞击速度低于800m·s~（-1）时,75℃条件下PBX-2炸药反应程度明显下降,但射弹撞击速度高于800m·s-1时,约1.54GPa的输入压力就能使75℃PBX-2炸药产生剧烈反应。

英文摘要：

To investigate the response characteristic of PBX-2 explosive under projectile impact at ambient temperature and 75℃, the projectile impact tests of PBX-2 explosive were conducted by a high temperature impact test device. The reaction overpressure of the explosive was measured by the shock-wave overpressure sensor and the response characteristics of the explosive at ambient temperature and 75℃ were comprehensively analyzed using recovered samples. The stress variation of PBX-2 at ambient tempera- ture and 75℃ at different impact velocities was calculated and analyzed using finite element program LS-DYNA. The results show that the threshold velocity of ignition reaction for PBX-2 explosive at ambient temperature is from 263.5 m· s-1 to 269.9 m· s-1 , while the threshold velocity of ignition reaction for PBX-2 heated to 75℃ is from 316 m· s-1 to 367m· s-1. Compared with am- bient temperature state, when the projectile velocity is less than 800 m· s-1 , the reaction degree of PBX-2 at 75 ℃ obviously de- creases. However, when the projectile velocity is higher than 800 m· s-1 , the impact pressure of about 1.54 GPa can make the PBX-2 at 25℃ occur violent reaction.