ABSTRACT

The plastic dynamic response and failure modes of ship broadside protection structures (SBPSs) subjected to contacted underwater explosion (UNDEX) are investigated. A novel engineering analytical model is proposed to evaluate the failure mechanisms and energy absorption characteristics. A numerical model considering the fluid-structure interaction (FSI) is built to analyze the plastic dynamic responses. The results show that the main energy dissipation parts of the SBPS are outside panel, separate bulkhead and inner expandable bulkhead. The maximum error between the analytical model and numerical results is 28%. Parametric studies show that charge position has a significant effect on the damage severity. The difference in the crevasse size can reach up to 40%. The selection of the thickness for shock wave venting bulkhead outside plate and bulkhead stiffener is most important, which coincides with the theoretical solution. The above method could provide worthy guidance to the design of the energy-absorbing structure of underwater weapons defense cabin of naval ships.

摘要

研究了水下接触爆炸（UNDEX）作用下船舶舷侧防护结构（SBPS）的塑性动力响应和失效模式。提出了一种新的工程分析模型来评估失效机制和能量吸收特性。建立考虑流固耦合（FSI）的数值模型来分析塑性动力响应。结果表明，SBPS的主要耗能部件是外板、​​独立舱壁和内膨胀舱壁。解析模型与数值结果之间的最大误差为 28%。参数研究表明，装药位置对损坏严重程度有显着影响。裂缝大小的差异可达 40%。冲击波泄放舱壁外板和舱壁加强筋的厚度选择最为重要，与理论解相吻合。上述方法可为海军舰艇水下武器防御舱吸能结构的设计提供有价值的指导。