壳体约束强度对温压炸药空中爆炸性能的影响

为评估壳体约束强度对温压炸药爆炸性能的影响,对不同壳体约束强度下的固体温压炸药进行野外静爆试验,用AUTODYN软件对该过程进行数值模拟,并与试验结果进行对比。结果表明,相同装药条件下,裸装药爆炸冲击波参数值、冲击波衰减速率和后燃峰压力值大于带壳装药;铝壳体装药爆炸冲击波参数值、冲击波衰减速率和后燃峰压力值较钢壳体装药高;数值模拟得到的冲击波曲线形态、峰值及冲量与试验结果吻合较好,且裸装药爆炸冲击波的后燃峰到达时间较带壳装药早,铝壳体装药爆炸冲击波的后燃峰到达时间较钢壳体早;初始冲击波超压值受壳厚影响较大,壳体的存在使冲击波的传播滞后。

Influence of Constraint Strength of Shells on the Performance of Thermobaric Explosives Blasting in the Air

To assess the influence of constraint strength of shells on the blasting performance of thermobaric charge, the static blasting experiment in air of solid thermobaric explosive under the constraint strength of different shells was carried out.The numerical simulation of the process was performed by AUTODYN software.The simulated results were compared with the test ones.The results show that the shock wave parameters, shock wave decay rate and after-burning pressure of charges without shell are higher than those of the explosives with shell under the same charging volume condition, and the shock wave parameters, after-burning pressure and shock wave decay rate of charges with aluminum shell are higher than those of charges with steel shells.The shock wave curve shape, peak and impulse obtained by numerical simulation are in good agreement with the experimental results.The arrival time of after-burning peak of explosion shock wave of charges without shell is earlier than that of charges with shells, and the arrival time of after-burning peak of explosion shock wave of charges with aluminum shell is earlier than that of charges with steel shell.The thickness of the shells have a larger impact on initial shock wave overpressure and the metal shells delay the spread of shock wave.