复合装药爆炸载荷下砌体墙破坏过程及动态响应

Failure Process and Dynamic Response of Masonry Wall under Blast Loading of Composite Charge

为了研究砌体墙在复合装药爆炸载荷下的破坏规律及动态响应,采用AUTODYN软件对其进行了数值计算,分析了复合装药冲击波传播及砌体墙的破坏过程,得到了0.5m距离内砌体墙表面载荷分布规律、砖块飞散速度规律及鼓包位移变化规律;比较了不同隔爆材料对砖块抛射速度的影响,计算了不同隔爆材料的临界观测位置高度。结果表明,冲击波压力峰值、比冲量值均随砌体墙高度的增加而减小且趋于均匀分布,单一装药条件下的压力峰值衰减幅度大于复合装药条件;JH2(8701)装药、含铝炸药、中心单点起爆及内外同时起爆爆炸加载方式下的临界观测位置高度分别为0.77、0.97、0.58和0.72m,有效实现了隔爆材料为聚氨酯的复合装药毁伤当量可调。钢和有机玻璃对抛射速度衰减幅度较大,铝和聚氨酯较低,橡胶材料介于两者之间。

To study the failure regularity and dynamic response of masonry wall under the blast loading of composite charge,the numerical calculation was carried out by the AUTODYN software,the shock wave propagation of composite charge and the failure process of masonry wall were analyzed,the load distribution law of the masonry wall,the law of the flying velocity of the bricks and the displacement change of the drums at 0.5 m distance were obtained.The effects of different flameproof materials on the ejecting velocity of bricks are compared.The critical observation height of different flameproof materials is calculated.The results show that the pressure peak value of the shock wave and the specific impulse values decrease with the increase of masonry wall height and tend to be uniform distribution,and the attenuation of pressure peak value under the single charge condition is larger than that of the composite charge.The critical observation site height under loading of 8701 charge,aluminized explosive,central single point initiation and the internal and external simultaneous initiation is 0.77,0.97,0.58 m and 0.72 m,respectively,which can effectively realize the adjustment of damage equivalent of the composite charge with the flameproof material as polyurethane.Steel and lucite have a larger attenuation rate of the ejecting velocity,aluminum and polyurethane are lower,and the rubber is between them.