典型相似结构柱壳装药殉爆响应数值模拟

为了研究相似结构柱壳装药殉爆响应的差异,选用常用于考核炸药殉爆不敏感性能的两种具有几何相似特性的典型柱壳装药结构,并采用数值模拟方法对φ60 mm和φ120 mm两种弹体的殉爆过程进行了分析.结果 表明,两种弹体壳体破裂形成的自然破片长宽比约为3.5:1,破裂前壳体壁厚与破片厚度的比值在1.5～1.75;φ60 mm弹体主发弹壳体破裂后形成尺寸较小的自然破片,被发弹发生殉爆是由于相邻多枚小破片撞击后压力叠加的结果,单枚小破片由于撞击后侧向压力波稀疏效应明显而无法起爆被发弹,增加弹间距降低了多枚小破片同时击中被发弹同一区域的概率;对于φ120 mm弹体,随着壳体厚度的增加,主发弹壳体破裂后形成尺寸较大的自然破片,单枚较大质量的破片撞击被发弹壳体的压力波汇聚效应较强,侧向稀疏区域较小,因此可以冲击起爆被发弹,增加弹间距只是降低较大质量破片击中被发弹的概率.研究结果为不敏感炸药殉爆考核的试验方法设计及结果分析提供参考.

Numerical Simulation of the Sympathetic Detonation Response of Cylindrical Shell Charge with Typical Similar Structures

In order to study the different sympathetic detonation response of similar cylindrical shell charge, two type cylindrical shell charge with geometrically similar characteristics, which are often used to evaluate the insensitive property of explosive, were selected, and the sympathetic detonation process of ?60mm and ?120mm projectiles were analyzed by numerical simulation method. The results show that the natural fragment length-width ratio is 3.5:1, and the ratio of shell thickness to the fragment thickness is between 1.5~1.75.The small size natural fragments are formed after the ?60mm main projectile shell breaks, and sympathetic detonation of the fired projectile is the result of pressure superposition caused by the impact of several adjacent small fragments, the single fragment fails to fire the fired projectile, because it has a stronger rarefaction wave zone. Increasing the distance between projectiles reduces the probability of several fragments hitting the same zone. For the ?120mm projectile body, as the increase of the shell thickness, the large size of natural fragments are formed after the main projectile shell breaks, the single larger mass of natural fragment can fire the fired projectile for the stronger pressure superposition effect and the smaller rarefaction wave zone. Increasing the spacing between projectiles only reduces the probability that a larger fragment will hit the fired projectile.