In this paper,the process of underwater explosion is analyzed by employing fragments of differ-ent shapes,mass and slenderness ratio. Particularly,the penetration damage to the protective water tanks on the side shell(especially to backwater plates)is numerically simulated using ABAQUS and the Cou-pled Eulerian-Lagrange(CEL)method. Also,the residual characteristic of the fragment after the penetra-tion of water tanks is discussed. It is observed that the residual velocity of spherical fragments is much larg-er than that of cylindrical fragments,and the slenderness ratio of fragments is a crucial factor that influenc-es the residual velocity.%为了抵御水下武器对舰船结构的毁伤，大型水面舰船在舷侧要设置多层防护结构。针对破片对防护水舱的毁伤情况以及破片穿透水舱的剩余特性问题，应用ABAQUS软件，采用耦合欧拉-拉格朗日方法，数值模拟了不同形状、不同质量、不同长细比的爆炸破片穿透舰船舷侧防护水舱，特别是背水钢板的演变过程。通过对数值试验结果的分析得到了爆炸破片穿透舷侧防护水舱剩余特性的规律。研究表明，球状破片的剩余速度要比柱状破片的剩余速度大得多，并且破片细长比也是影响破片剩余速度的重要因素。
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