活性破片撞击液箱毁伤行为仿真研究

Simulation Study on the Damage of Liquid Tank Impacted by Reactive Fragments

显著不同于传统惰性金属破片,活性破片在撞击液箱时,能够利用动能撞击和爆燃反应等双重机理实现侵、爆耦合作用液箱毁伤模式。文章利用AUTODYN有限元分析软件,研究了活性破片撞击液箱的结构毁伤增强行为。研究结果表明,在撞击液箱过程中,活性破片进入液体后将在化学能释放作用下形成类椭圆形空穴,且对液箱侧壁面造成的冲击更为严重;随着液箱前板厚度增加,空穴体积和前板最大隆起呈现先增大后减小趋势,前板侵孔直径则呈现逐渐增大趋势;随着撞击速度加快,活性破片激活率增加且动能增大,空穴体积和前板最大隆起逐渐增大,前板侵孔直径逐渐减小;随着注水率逐渐下降,箱体受到的冲击强度逐渐减小,前板最大隆起减小,且前板变形逐渐集中在一侧,但前板侵孔直径变化不明显。

Significantly different from traditional inert metal fragments,reactive fragments can utilize dual mechanisms of kinetic impact and deflagration to achieve a coupled damage mode of invasion and explosion when impacting a liquid tank.Accordingly,the article uses AUTODYN finite element analysis software to study the structural damage enhancement of reactive fragments.The research findings indicate that during the process,the reactive fragments will form elliptical shaped cavities under the release of chemical energy,and the impact on the side wall of the tank is greater;with the increase of the thickness of the front plate,the volume of cavities and the maximum protrusion of the front plate show a trend of increase-decrease,while the diameter of the cavities shows a trend of gradual increase;As the impact speed increases,both the activation rate and kinetic energy increases.The volume of cavities and the maximum protrusion of the front plate increase,while the diameter of the cavities decreases;With the gradual decrease of water injection rate,the impact strength on the box as well as the maximum protrusion of the front plate decreases,and the deformation of the front plate gradually concentrates on one side,but the change in the diameter of the cavities is not significant.