复杂边界条件下近场水下爆炸对固支方板的毁伤效应

邓硕 赖志超 秦健 孟祥尧 迟卉 黄瑞源

邓硕, 赖志超, 秦健, 孟祥尧, 迟卉, 黄瑞源. 复杂边界条件下近场水下爆炸对固支方板的毁伤效应[J]. 爆炸与冲击, 2023, 43(11): 112204. doi: 10.11883/bzycj-2023-0164
引用本文: 邓硕, 赖志超, 秦健, 孟祥尧, 迟卉, 黄瑞源. 复杂边界条件下近场水下爆炸对固支方板的毁伤效应[J]. 爆炸与冲击, 2023, 43(11): 112204. doi: 10.11883/bzycj-2023-0164
DENG Shuo, LAI Zhichao, QIN Jian, MENG Xiangyao, CHI Hui, HUANG Ruiyuan. Damage effects of clamped square plates by near-field underwater explosion with complex boundary conditions[J]. Explosion And Shock Waves, 2023, 43(11): 112204. doi: 10.11883/bzycj-2023-0164
Citation: DENG Shuo, LAI Zhichao, QIN Jian, MENG Xiangyao, CHI Hui, HUANG Ruiyuan. Damage effects of clamped square plates by near-field underwater explosion with complex boundary conditions[J]. Explosion And Shock Waves, 2023, 43(11): 112204. doi: 10.11883/bzycj-2023-0164

复杂边界条件下近场水下爆炸对固支方板的毁伤效应

doi: 10.11883/bzycj-2023-0164
基金项目: 国家自然科学基金(12172178)
详细信息
    作者简介:

    邓 硕(1999- ),男,硕士研究生,shuodeng1999@163.com

    通讯作者:

    黄瑞源(1984- ),男,博士,研究员,huangruiyuan1984@163.com

  • 中图分类号: O383.1

Damage effects of clamped square plates by near-field underwater explosion with complex boundary conditions

  • 摘要: 近场水下爆炸会产生复杂的载荷模式,而复杂的边界条件使结构在近场水下爆炸作用下的毁伤形态更加难以预测。因此,采用耦合的欧拉-拉格朗日算法探究了水下爆炸气泡在多边界耦合作用下(自由面、弹塑性板、泥沙边界)的演化过程及其对固支方板的毁伤效应。首先,开展了2.5 g TNT在不同尺寸(板边长为0.46、0.92和1.61倍最大气泡直径)固支方板底部10 cm起爆的水下爆炸试验,验证了有限元方法的准确性。然后,结合试验和有限元结果分析了不同边界条件下板的毁伤机理。最后,通过系列数值模拟发现:随着板尺寸和爆距的增大,气泡会出现溃散、下射流和上射流3种不同的演化方式;随着板尺寸的增大,爆距对板中心最终变形的影响减小;泥沙边界能减缓气泡收缩,使气泡从中部塌陷形成方向相反的对射流,降低固支方板的位移和应变,对于气泡提前溃散的工况,泥沙边界基本无影响。
  • 图  1  耦合欧拉-拉格朗日方法的求解过程

    Figure  1.  The solution procedure of the coupled Eulerian-Lagrangian method

    图  2  场地布置及试件设计

    Figure  2.  Site layout and specimen design

    图  3  有限元模型

    Figure  3.  Finite element models

    图  4  不同网格尺寸下距药包中心不同距离处的冲击波峰值压力对比

    Figure  4.  Comparison of peak shock wave pressures at different distances from the charge center under different element sizes

    图  5  TNT在20 cm×20 cm板底起爆引起的气泡演化

    Figure  5.  Evolution images of bubbles caused by the explosion of a TNT charge at the bottom of the 20 cm×20 cm plate

    图  6  TNT在40 cm×40 cm板底起爆引起的气泡演化

    Figure  6.  Evolution images of bubbles caused by explosion of the TNT charge at the bottom of the 40 cm×40 cm plate

    图  7  TNT在70 cm×70 cm板底起爆引起的气泡演化

    Figure  7.  Evolution images of bubbles caused by the explosion of a TNT charge at the bottom of the 70 cm×70 cm plate

    图  8  气泡半径-时程曲线

    Figure  8.  The time-history curve of equivalent bubble radius

    图  9  20 cm×20 cm板的毁伤模式

    Figure  9.  Damage mode of the 20 cm×20 cm plate

    图  10  40 cm×40 cm板的毁伤模式

    Figure  10.  Damage mode of the 40 cm×40 cm plate

    图  11  70 cm×70 cm板的毁伤模式

    Figure  11.  Damage mode of the 70 cm×70 cm plate

    图  12  参数示意图

    Figure  12.  Schematic diagram of parameters

    图  13  下射流的形成过程

    Figure  13.  The formation process of the downward jet

    图  14  水射流的不同形态

    Figure  14.  Different forms of water jets

    图  15  位移时程曲线

    Figure  15.  Displacement-time curves

    图  16  固支方板的最终毁伤特征曲线

    Figure  16.  Final damage characteristic curves of clamped square plates

    图  17  气泡的演化过程(μ=0.46, da=10 cm)

    Figure  17.  The evolution process of bubbles (μ=0.46, da=10 cm)

    图  18  气泡的演化过程(μ=1.38, da=1 cm)

    Figure  18.  The evolution process of bubbles (μ=1.38, da=1 cm)

    图  19  吃水深度对板动态响应的影响

    Figure  19.  Effects of draught depth on the dynamic responses of the plates

    图  20  泥沙边界对气泡演化的影响(μ=0.46)

    Figure  20.  Effects of sediment boundaries on bubble evolution (μ=0.46)

    图  21  泥沙边界对气泡演化的影响(μ=1.38)

    Figure  21.  Effects of sediment boundaries on bubble evolution (μ=1.38)

    图  22  泥沙边界对射流形成的影响

    Figure  22.  Effects of sediment boundaries on jet formation

    图  23  泥沙边界对板动态响应的影响

    Figure  23.  Effects of sediment boundaries on dynamic responses of plates

    表  1  试验工况

    Table  1.   Test conditions

    工况药包质量/g爆距/cmL/cml/cm厚度/mm
    12.51070602
    22.51040302
    32.51020102
    下载: 导出CSV

    表  2  数值模拟工况设置

    Table  2.   Numerical simulation condition settings

    工况 方板尺寸 μ 方板爆距/cm γ
    1 20 cm×20 cm 0.46 10 0.46
    2 15 0.69
    3 20 0.92
    4 25 1.15
    5 30 1.38
    6 40 cm×40 cm 0.92 10 0.46
    7 15 0.69
    8 20 0.92
    9 25 1.15
    10 30 1.38
    11 50 cm×50 cm 1.15 10 0.46
    12 15 0.69
    13 20 0.92
    14 25 1.15
    15 30 1.38
    16 60 cm×60 cm 1.38 10 0.46
    17 15 0.69
    18 20 0.92
    19 25 1.15
    20 30 1.38
    21 70 cm×70 cm 1.61 10 0.46
    22 15 0.69
    23 20 0.92
    24 25 1.15
    25 30 1.38
    下载: 导出CSV

    表  3  吃水深度工况设置

    Table  3.   Settings of draught depth

    工况 方板尺寸 μ da/cm
    1 20 cm×20 cm 0.46 0
    2 1
    3 3
    4 5
    5 10
    6 60 cm×60 cm 1.38 0
    7 1
    8 3
    9 5
    10 10
    下载: 导出CSV

    表  4  泥沙边界工况设置

    Table  4.   Sediment boundary condition settings

    工况 方板尺寸 μ 药包距泥沙边界距离/cm λ
    1 20 cm×20 cm 0.46 10 0.46
    2 20 0.92
    3 30 1.38
    4 40 1.84
    5 60 cm×60 cm 1.38 10 0.46
    6 20 0.92
    7 30 1.38
    8 40 1.84
    下载: 导出CSV
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  • 收稿日期:  2023-05-05
  • 修回日期:  2023-09-12
  • 网络出版日期:  2023-09-13
  • 刊出日期:  2023-11-17

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