舱内爆炸冲击载荷特性实验研究

  目的  为研究典型舱内爆炸载荷对加筋板的毁伤特性，将舱内爆炸载荷分为初始爆炸冲击波载荷和准静态气压载荷，利用有限元分析软件LS-DYNA开展爆炸载荷下固支单向加筋板毁伤特性的数值模拟。  方法  主要模拟载荷冲量相等和载荷峰值相等时固支单向加筋板的变形特性，以及加筋板分别在初始爆炸冲击波载荷、准静态气压载荷及2种载荷联合作用下的毁伤特性，并分析上述载荷作用下加筋板的变形特点。  结果  结果表明：当作用在加筋板上的冲量相等、载荷作用时间小于0.05倍垂向一阶自振周期时，加筋板的最终挠度值处于最大值附近；当载荷峰值相同时，存在饱和冲量值，达到饱和冲量值以后，载荷作用时间不再影响加筋板的最终变形。  结论  在舱内爆炸载荷作用下，加筋板的最终变形不是2种载荷作用下的简单叠加，2种载荷的联合作用会增强毁伤效果。

Analysis of reflected blast wave pressure profiles in a confined room

  Objectives  In order to study the damage characteristics of a typical cabin explosion load on stiffened plates, the explosion load in a cabin is divided into the initial explosion shock wave load and quasi-static air pressure load, finite element analysis software LS-DYNA is used to simulate and calculate the damage characteristics of fixed stiffened plates under the explosive load.  Methods  In this paper, the deformation characteristics of the stiffened plate under the same impulse and peak load are simulated, and the damage characteristics of the stiffened plate under the initial explosion shock wave load, quasi-static air pressure load and the combined action of the two loads are analyzed.  Results  The results show that when the impulse acting on the stiffened plates is equal and the load action time is less than 0.05 times the vertical first-order natural vibration period, the final deflection value of the stiffened plates is near the maximum value. When the load peaks are equal, there is a saturation impulse value, after which the loading time no longer affects the final deformation of the stiffened plates.  Conclusions  The final deformation of stiffened plates under an explosion load in a cabin is not a simple superposition under the action of two loads; the combined effect of the two loads enhances their damage.