近场爆炸下舰船破损舱室内部载荷特性分析

Analysis of internal load characteristics of damage cabin under near-field underwater explosion

  • 摘要:
    目的 旨在揭示近场爆炸下破损舱室内部载荷特性。
    方法 以大尺度舱段模型水下近场爆炸试验为基础,针对试验后由模型外板形成的高速破片群载荷、由爆轰产物引起的准静态压力载荷以及由气泡失稳引起的水射流载荷等,采用数值仿真与理论手段进行深入分析。
    结果 结果显示,在近场水下爆炸下,由舷侧外板形成的飞向舱室内爆的次生高速破片载荷仍具有很高的飞行速度,可对舱室内部结构及设备形成二次打击,基于改进的泰勒平板理论的计算方法可用于评估高速破片的速度;舷侧外板在强冲击波载荷作用下形成破口后,后续的爆轰产物通过破口进入舱室内部可形成类似于“准静态压力载荷”,对内部舱室舱壁、甲板等构件形成整体大变形破坏模式,并引起构件连接处的撕裂破坏;舷侧外板形成破口后,首次发现破损舱室内部可遭受来自高速水流的二次毁伤破坏,高速水流的形成因素主要包含3类。
    结论 所做研究可为后续水下近场爆炸下破损舱室内部载荷评估提供重要依据。

     

    Abstract:
    Objective This paper aims to explore the internal load characteristics of a damaged cabin under near-field underwater explosion.
    Method A cabin model is designed and applied to a near-field underwater explosion experiment during the prophase. The internal load characteristics including high-speed fragments, quastic pressure, and jetting are analyzed based on the experimental results and applied with the numerical simulation and theory methods.
    Results The velocity of high-speed fragments flying into the damaged cabin from shipboard plates is calculated using the modified Taylor plate method. The crevasses of the shipboard plates mainly result from shockwave pressure, and quastic pressure due to the expanding bubble entering the damaged cabin further damages the inner structure. Damage from jetting is evident in this experiment, and the three main reasons behind it are identified.
    Conclusion This paper can provide valuable references for predicting the internal load characteristics of a damaged cabin under near-field underwater explosion.

     

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