仿生BCC结构的准静态压缩数值模拟及吸能性

吴伟 张辉 曹美文 张霞 陈飞 梁清香 常超

吴伟, 张辉, 曹美文, 张霞, 陈飞, 梁清香, 常超. 仿生BCC结构的准静态压缩数值模拟及吸能性[J]. 高压物理学报, 2020, 34(6): 062402. doi: 10.11858/gywlxb.20200578
引用本文: 吴伟, 张辉, 曹美文, 张霞, 陈飞, 梁清香, 常超. 仿生BCC结构的准静态压缩数值模拟及吸能性[J]. 高压物理学报, 2020, 34(6): 062402. doi: 10.11858/gywlxb.20200578
WU Wei, ZHANG Hui, CAO Meiwen, ZHANG Xia, CHEN Fei, LIANG Qingxiang, CHANG Chao. Numerical Simulation of Quasi-Static Compression and Energy Absorption of Bionic BCC Structure[J]. Chinese Journal of High Pressure Physics, 2020, 34(6): 062402. doi: 10.11858/gywlxb.20200578
Citation: WU Wei, ZHANG Hui, CAO Meiwen, ZHANG Xia, CHEN Fei, LIANG Qingxiang, CHANG Chao. Numerical Simulation of Quasi-Static Compression and Energy Absorption of Bionic BCC Structure[J]. Chinese Journal of High Pressure Physics, 2020, 34(6): 062402. doi: 10.11858/gywlxb.20200578

仿生BCC结构的准静态压缩数值模拟及吸能性

doi: 10.11858/gywlxb.20200578
基金项目: 山西省高等学校科技创新项目(2019L0624)
详细信息
    作者简介:

    吴 伟(1995-),男,硕士研究生,主要从事金属材料的力学行为研究.E-mail:2451422393@qq.com

    通讯作者:

    常 超(1986-),男,博士研究生,副教授,主要从事金属材料的力学行为研究. E-mail:cc@tyust.edu.cn

  • 中图分类号: O341

Numerical Simulation of Quasi-Static Compression and Energy Absorption of Bionic BCC Structure

  • 摘要: 晶格点阵结构因具有质量轻、吸能性好等优点,被广泛应用于航空、航天、军工等领域。研究了仿生体心立方(BCC)结构的吸能性,并探讨了截面形貌对BCC晶格结构吸能性的影响。基于毛竹的宏观结构和细观结构,设计了3种不同的BCC仿竹晶格点阵结构,对3种结构及原始BCC晶格结构进行了轴向准静态压缩数值模拟。结果表明:静载下仿竹BCC结构的吸能性和比吸能均比原始BCC结构提高了25%以上,但3种仿竹BCC结构的吸能性、比吸能相差不大;仿竹BCC结构的相对密度对其吸能性和比吸能的影响较大;在压缩过程中,仿生结构的韧性截面有效保证了塌陷稳定性,这是该结构吸能稳定的重要原因。

     

  • 图  成年毛竹的宏观结构(a)和竹壁截面的细观结构(b)以及1/4部分的3种截面(c)

    Figure  1.  Macro structure of adult phyllostachys pubescens (a) and mesoscopic structure ofbamboo wall section (b),three cross sections representing 1/4 part (c)

    图  晶格结构示意图:(a)原始BCC晶格结构,(b)空心结构,(c)Ⅰ型结构,(d)Ⅱ型结构

    Figure  2.  Schematic of the lattice structure: (a) original BCC structure, (b) hollow structure, (c) type I structure, (d) type II structure

    图  晶格结构准静态压缩有限元模型

    Figure  3.  Quasi-static compression finite elementmodel of lattice structure

    图  4种结构的网格模型

    Figure  4.  Grid models of four structures

    图  网格尺寸敏感性分析

    Figure  5.  Sensitivity analysis of grid size

    图  验证试样及其实验和数值模拟对比

    Figure  6.  Validated samples and comparison of the experiments and numerical simulations

    图  4种相对密度下晶格结构的应力-应变曲线

    Figure  7.  Stress-strain curves of lattice structure under four relative densities

    图  相对密度为22%的4种结构的能量吸收曲线

    Figure  8.  Energy absorption curves of four structures with a relative density of 22%

    图  4种晶格结构的能量吸收

    Figure  9.  Energy absorption of four lattice structures

    图  10  4种晶格结构的比吸能

    Figure  10.  Specific energy absorption of thefour lattice structures

    图  11  Ⅰ型晶格结构变形模式和应力云图

    Figure  11.  The deformation mode and strain nephogramof the typeⅠlattice structure

    表  1  晶格结构的物理参数

    Table  1.   Physical parameters of the lattice structure

    Lattice
    structure
    Relative
    density/%
    Diameter/mmCross-sectional
    area/mm2
    Thickness/mmMinimum
    thickness/mm
    Original structure131.66
    151.81
    192.08
    222.25
    Hollow
    structure
    1326.560.35
    1530.880.41
    1938.560.54
    2243.580.64
    Type Ⅰ
    structure
    1324.070.06
    1527.800.07
    1936.640.10
    2241.920.12
    Type Ⅱ
    structure
    1323.840.10
    1528.220.13
    1936.130.17
    2241.410.20
    下载: 导出CSV

    表  2  晶格结构在0 < ε < 0.4范围内的能量吸收和比吸能

    Table  2.   Energy absorption and specific energy absorption of lattice structure at 0 < ε < 0.4

    Lattice structureMass/gEA/MJESA/(MJ·g–1)
    Original structure7.9848.136.03
    9.5354.395.71
    12.2168.515.62
    13.9881.725.85
    Hollow structure8.1478.139.60
    9.5586.589.07
    12.23105.688.64
    14.04114.658.17
    Type I structure8.1478.629.66
    9.4088.149.38
    Type I structure12.3997.837.90
    14.16105.647.46
    Type Ⅱ structure8.0479.219.85
    9.5887.299.11
    12.2699.528.12
    14.04103.167.35
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-06-28
  • 修回日期:  2020-07-22

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