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中文摘要：
在水下非接触爆炸中，气泡载荷因其脉动频率经常接近于舰船的垂向固有频率而造成舰船总体毁伤。阐述水下爆炸气泡与弹塑性船体梁-e．_N的流固耦合理论，建立了一个考虑气泡迁移，自由面效应和气泡阻力的气泡模型和船体梁的弹塑性模型。以实船为算例，计算了气泡载荷作用下船体梁的弹塑性变形，分析船体梁发生弹塑性损伤的机理和特征。
英文摘要：
In non-contact underwater explosion, bubble loading can cause ship hull＇s global damage, because bubble pulsating frequency is always close to ship＇s low-order eigenfrequency. Elastic-plastic damage of a ship hull girder subjected to an underwater explosion bubble is presented in this study. Interaction between gas bubble and elastic-plastic hull girder is described theoretically. A bubble model with migration, free surface effect and drag force taken into consideration and an elastic-plastic ship hull girder model are established. A real-scale ship example is given to calculate elastic and plastic response of a hull girder induced by bubble impulsive pressure. Mechanism and main features of elastic and plastic damage of hull girder are discussed.
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