水下爆炸作用下结构响应数值分析

Response of Structure to Underwater Explosion

作者: 专业:船舶与海洋结构物设计制造 导师:李海涛 年度:2010 学位:硕士  院校: 大连理工大学

Keywords

Underwater explosion, Whipping, Cylindrical shell, Bubble pulse, Response of structures

        水下爆炸对舰船等结构物构成严重的威胁。水下爆炸过程非常复杂,因此理论分析的难度大。实船实验研究可以得到许多有用的信息,但实船实验需要耗费大量的资源。随着计算机的快速发展,数值方法被越来越广泛地应用到对水下爆炸现象的分析上。以往的工作主要集中在冲击波的破坏机理方面,近些年的实验及分析表面,气泡脉动可能对结构的整体破坏起到更主要的作用。围绕这一问题,本文做了主要进行了以下工作:(1)从理论、实验、数值方法等方面回顾了国内外关于结构在水下爆炸作用下的响应方面的研究进展,掌握最新发展动态,掌握建模和数值模拟的方法的关键技术,为本文的后续工作提供基础。(2)通过与理论结果及文献结果进行对比,验证了数值模拟结构在水下爆炸作用下响应的有效性和准确性。借助Geers-Hunter模型计算了水下爆炸载荷,分析了冲击波压力峰值随炸药质量和爆距的变化,水下爆炸气泡最大半径和气泡脉动周期随炸药质量和炸药埋深的变化规律。(3)数值模拟和分析了水下圆柱壳在冲击波单独作用、冲击波和气泡共同作用、不同壳厚、圆柱壳不同长度、不同炸药埋深、不同爆炸位置等工况下的响应情况;计算和研究了水面箱型船及拖船在不同工况下的响应,总结出了一些有价值的规律。本论文的研究工作旨在探索结构在水下爆炸作用下的响应规律和破坏机理,为工程领域内舰船抗冲击设计提供参考。
    Underwater explosion pose a serious threat to warships. It is very difficult to make theoretical analysis because of the complexity of underwater explosion process. Experimental study can bring many useful information. However, it cost a lot of resources to do experiment. With the quick development of computers, numerical method is widely applied to the analysis of underwater explosion. The attentions were mostly paid to the effect of shock wave in previous work. However, experiments and analysis in late years show that bubble pulse may play a more role in the overall damage of structures. The following work is mainly done in this paper.(1)Developments of research about the response of structures to underwater, explosion are reviewed in aspects such as academic analysis, experimental and numerical methods. Key techniques of modeling and numerical method are mastered, providing basis for the following study.(2)Results from numerical method are compared with the results in the literature. It shows the validity and veracity of the numerical method applied in this paper. Underwater explosion pressure is computed applying Geers-Hunter model. Peak pressure of shock wave with different charge weight and different explosion distance is studied. The maximum radius of bubble and the pulsation period of bubble with different charge weight and depth are investigated.(3)Response of underwater cylindrical shell in work conditions such as shock wave acting alone, shock wave and bubble pulse acting together, with different shell thickness, with different length of the shell, with different charge depth and with different explosion position. The response of box ship and tugboat in different conditions are calculated and studied. Some valuable regulations about the response of structure to underwater explosion are gotten.The research work in this paper is mainly to explore the response rule and failure mechanism of structure to underwater explosion and provide reference to the design of warships.
        

水下爆炸作用下结构响应数值分析

摘要4-5
Abstract5
1 前言8-19
    1.1 研究背景8-9
    1.2 国内外相关研究现状综述9-18
        1.2.1 水下非接触爆炸载荷及其传递研究综述9-10
        1.2.2 流固耦合的解耦方法研究综述10-13
        1.2.3 水下非接触爆炸作用下的船体响应及破坏13-18
    1.3 本论文主要研究内容18-19
2 水下爆炸载荷及效应19-26
    2.1 引言19
    2.2 水下爆炸压力波19-20
    2.3 气泡的运动20-21
    2.4 气泡脉动引起的压力21
    2.5 水下爆炸载荷的半经验半解析公式21-23
    2.6 空化现象23-25
        2.6.1 空化模型准则23-24
        2.6.2 局部空化产生的机理24-25
    2.7 本章小结25-26
3 基于ABAQUS的水下爆炸对结构物作用的数值模拟26-44
    3.1 引言26
    3.2 基本理论26-37
        3.2.1 ABAQUS中水下爆炸载荷计算26-31
        3.2.2 流固耦合方程31-34
        3.2.3 显示动态分析34-36
        3.2.4 边界条件及载荷处理36-37
        3.2.5 建模及计算过程37
    3.3 计算方法验证37-42
        3.3.1 梁的动塑性响应37-39
        3.3.2 ABAQUS模拟入射波在流体中的传播39-41
        3.3.3 气泡脉动作用下圆截面梁响应41-42
    3.4 本章小结42-44
4 结构物受水下爆炸作用响应分析44-76
    4.1 圆柱壳结构在水下爆炸作用下的响应分析44-55
        4.1.1 圆柱壳结构模型及测点介绍44-45
        4.1.2 不同工况下的结构响应及分析45-55
    4.2 箱型船在水下爆炸作用下的响应55-65
        4.2.1 模型及测点位置55-56
        4.2.2 结构模态计算56
        4.2.3 计算工况及结果56-65
    4.3 拖船在水下爆炸作用下的响应65-73
        4.3.1 模型及测点位置66-67
        4.3.2 计算工况及结果67-73
    4.4 本章小结73-76
结论76-77
参考文献77-82
攻读硕士学位期间发表学术论文情况82-83
致谢83-85
        
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