舰船防护结构抗近爆毁伤作用数值模拟

Numerical Simulation of Near Explosion Damage Effect on Ship Protective Structure

针对舰船防护结构抗近爆毁伤问题,分析了冲击波的传播规律和高速破片的运动规律,得到需要考虑二者耦合作用的爆距和时间判据。构建了防护结构整体模型,采用流固耦合算法并叠加近爆冲击波和预制高速破片,实现二者对防护结构耦合毁伤作用的数值模拟,并与只考虑高速破片时的效果进行了对比。结果表明,在近距离爆炸情况下,必须考虑冲击波和高速破片的耦合毁伤作用;耦合作用对防护结构的毁伤程度更加严重,毁伤机理更加复杂。基于耦合毁伤机理,提出防护结构的改进方法,用于提高其防护能力。

To study the problem of near explosion damage effect on ship protective structure,the propagation law of shock wave and motion law of high-velocity fragment were analyzed theoretically,and the criteria of detonation distance and time were obtained for considering the coupling effect.Then the whole model of protective structure was constructed,and the fluid-structure interaction algorithm was adopted to simulate the coupling damage effect on protective structure by superimposing near explosion shock wave and prefabricating high-velocity fragment,and the comparison was made with that of only considering high-velocity fragment.The results show that the coupling damage effect of shock wave and high-velocity fragment must be considered in the case of near explosion.The coupling damage effect on ship protective structure is more serious and the coupling damage mechanism is more complex.Based on the coupling damage mechanism,the structural optimization method aiming at protective structure was proposed to improve its protective ability.