爆炸载荷下仿贝壳结构的动态响应

李志洋 雷建银 刘志芳

李志洋, 雷建银, 刘志芳. 爆炸载荷下仿贝壳结构的动态响应[J]. 爆炸与冲击, 2022, 42(8): 083101. doi: 10.11883/bzycj-2022-0145
引用本文: 李志洋, 雷建银, 刘志芳. 爆炸载荷下仿贝壳结构的动态响应[J]. 爆炸与冲击, 2022, 42(8): 083101. doi: 10.11883/bzycj-2022-0145
LI Zhiyang, LEI Jianyin, LIU Zhifang. Dynamic response of nacre-like structure under explosion load[J]. Explosion And Shock Waves, 2022, 42(8): 083101. doi: 10.11883/bzycj-2022-0145
Citation: LI Zhiyang, LEI Jianyin, LIU Zhifang. Dynamic response of nacre-like structure under explosion load[J]. Explosion And Shock Waves, 2022, 42(8): 083101. doi: 10.11883/bzycj-2022-0145

爆炸载荷下仿贝壳结构的动态响应

doi: 10.11883/bzycj-2022-0145
基金项目: 国家自然科学基金(11902215)
详细信息
    作者简介:

    李志洋(1996- ),男,硕士, lizhiyang365@163.com

    通讯作者:

    雷建银(1989- ),男,博士, leijianyin@tyut.edu.cn

  • 中图分类号: O342

Dynamic response of nacre-like structure under explosion load

  • 摘要: 贝壳珍珠层是一种具有高强度和高韧性的天然材料,这种优异的性能主要来源于多尺度、多层级的“砖泥”结构。本文受贝壳特殊结构的启发,构建了仿贝壳砖泥结构的有限元模型,并进行了爆炸实验。通过实验发现:在爆炸冲量为0.047 N·s时,试件发生灾难性破坏,使得中心处发生掉落,且伴随着试件夹持端的剪切破坏,与数值模拟结果具有良好的一致性。在实验基础上,对仿贝壳砖泥结构在爆炸载荷下的动态响应进行了数值模拟。研究发现,在爆炸载荷下仿贝壳砖泥结构会产生五种不同的破坏模式,包括:Ⅰ,结构整体无损伤;Ⅱ,结构前表面无明显破坏,后表面发生破坏;Ⅲ,结构发生掉落型贯穿破坏,夹持端无剪切破坏;Ⅳ,结构发生小块掉落型贯穿破坏,夹持端发生剪切破坏;Ⅴ,结构发生大块掉落型贯穿破坏,夹持端发生剪切破坏。并且给出了不同破坏模式的临界阈值,单层砖泥结构的破坏阈值为0.019 N·s,五层砖泥结构的破坏阈值为0.047 N·s,当冲量超过破坏阈值时,试件发生灾难性破坏。研究分析了堆叠层数对仿生结构的力学响应,在同一冲量下,随着层数的增加,结构的破坏模式发生改变,由贯穿型破坏逐渐变为仅发生一定塑性变形。随着层数增加,结构的损伤阈值增加。最后提出仿贝壳砖泥结构的增韧机理主要有裂纹偏转和微裂纹。
  • 图  1  仿贝壳砖泥结构的单层和多层胞元建模

    Figure  1.  Single-layer and multi-layer cell construction process of nacre-like brick and mortar structure

    图  2  仿贝壳砖泥结构整体建模

    Figure  2.  Overall model building processes of nacre-like bricks and mortar structures

    图  3  五层仿贝壳砖泥结构实验样品

    Figure  3.  Front view of the five-layer nacre-like brick and mortar structure experimental piece

    图  4  爆炸实验装置

    Figure  4.  Explosion experimental device

    图  5  有限元模型

    Figure  5.  Diagram of FE model

    图  6  试验与数值模拟结果图

    Figure  6.  Test and numerical simulation results

    图  7  冲击波作用能量时程

    Figure  7.  History of shock wave energy

    图  8  失效模式Ⅰ,非弹性形变

    Figure  8.  Failure mode Ⅰ, inelastic deformation

    图  9  失效模式Ⅱ,局部损伤

    Figure  9.  Failure mode Ⅱ, partial damage

    图  10  失效模式Ⅲ,贯穿损伤

    Figure  10.  Failure mode Ⅲ, through-wall damage

    图  11  失效模式Ⅳ,贯穿及剪切损伤

    Figure  11.  Failure mode Ⅳ, through-wall and shear damage

    图  12  失效模式Ⅴ,破环式损伤

    Figure  12.  Failure mode Ⅴ, devastating damage

    图  13  五层结构在冲量0.030 N·s下的有效应力分布

    Figure  13.  Distribution of effective stress of five-layer structure under impulse of 0.030 N·s

    图  14  五层结构在冲量0.047 N·s下的有效应力分布

    Figure  14.  Distribution of effective stress of five-layer structure under impulse of 0.047 N·s

    图  15  不同堆叠层数的破坏模式图

    Figure  15.  Failure modes at different stacking layers

    图  16  5层结构在冲量0.039 N·s下的裂纹偏转

    Figure  16.  Crack deflection of five-layer structure under impulse of 0.039 N·s

    图  17  五层结构在冲量0.047 N·s下的微裂纹

    Figure  17.  Microcracks of five-layer structure under impulse of 0.047 N·s

    表  1  不同层级结构在不同药量下的动态响应

    Table  1.   Dynamic response of structure with different layers to different explosive charges

    冲量/(N·s)1 layer2 layers3 layers4 layers5 layers
    0.019
    0.030
    0.035
    0.039
    0.047
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-04-07
  • 修回日期:  2022-05-24
  • 网络出版日期:  2022-06-02
  • 刊出日期:  2022-09-09

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