The longitudinal strength of submerged structures subjected to noncontact underwater explosion is a hot topic in national defense. In this paper, employing the Taylor's theory of plates and considering the surface cutoff effect, the coupling pressure in the bottom surface of the ship structure was modified. Then, the theoretical and computational methods were deduced to study the impact bending moment of the simplified elastic ship-hull beam. Finally, the evaluation method of the longitudinal strength of the ship hull subjected to underwater explosion was proposed. The full-scale ship test results verify the correctness of the theoretical method. The corresponding forecast software was developed which provides a means for evaluation and prediction of the longitudinal strength of ship hulls.%水中兵器战斗部在水面舰船和潜艇附近爆炸对船体的总纵强度毁伤是目前国际上研究的前沿和热点.基于Taylor平板理论,计及自由液面截断效应,对船底表面处的耦合压力进行修正,推导并建立船体梁爆炸冲击弯矩的理论与计算方法,提出一套用于水下爆炸作用下船体梁总纵强度估算方法.通过实验数据验证理论方法的正确性.结合理论方法开发相应的总纵强度预报软件,为舰船在冲击波载荷作用下的总纵强度工程化预报提供参考.
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