薄钢板在CL-20基含铝炸药内爆载荷作用下的变形响应和工程预测

针对圆形钢板在内爆炸载荷作用下的变形响应问题,利用爆炸容器罐进行了一系列以六硝基六氮杂异伍兹烷(CL-20)基含铝炸药为主的内爆炸试验。以圆形钢板作为容器罐装填口的密封结构来承受装药爆炸冲击载荷,开展了100 g、200 g两种装药量下10%、20%、30%3种不同铝含量的CL-20基含铝炸药内爆炸冲击加载密封钢板的测试试验;建立了密封钢板最大残余变形挠度的工程预测模型。结果表明:铝粉在后燃烧阶段释放的能量对冲击钢板变形能起到一定作用,密封钢板的最大残余变形量取决于炸药内爆炸初始冲击波的有效冲量(正相位冲量);对于200 g装药量,随着铝含量由10%升至30%,初始冲击波有效冲量依次降低6. 9%和7. 8%,钢板的变形和失效程度减小,最大残余变形挠度依次减小5. 3%和7. 5%.

Deformation Response and Its Engineering Prediction of Steel Plate Subjected to Internal Blast Loading from CL-20-based Aluminized Explosive Charges

The deformation response of thin steel plate subjected to the internal blast loading from hexanitrohexaazaisowurtzitane (CL-20)-based aluminized explosive charges was studied through a series of experiments. Circular steel plates as the sealing structure of a specially designed explosion vessel are subjected to internal blast loading. Aluminized explosives composed of a base of CL-20 with two kinds of charge masses (100 g/200 g) and three kinds of aluminum mass content (10%/20%/30%) were used for the internal explosion tests of the sealing steel plates. In addition, the results indicate that the energy released from the powdered aluminum at the later stage of its combustion can play a role in the deformation of steel plates, and the maximmum residual plastic deflection of sealing steel plates is determined by the effective impulse of initial blast shock wave, which is the positive phase impulse of initial shock wave. For the 200 g charge mass, when aluminum content is increased from 10% to 30%, the effective impulse of initial shock wave is decreased by 6.9% and 7.8%, respectively, and the degrees of deformation and damage of sealing steel plate are decreased accordingly, and the maximum residual deflection of steel plate is decreased by 5.3% and 7.5%, respectively. An engineering prediction model is established for predicting the maximum residual deformation deflection of sealing steel plate.