爆炸驱动亚毫米级金属颗粒群的飞散特性

冯吉奎 皮爱国 刘源 景莹琳

冯吉奎, 皮爱国, 刘源, 景莹琳. 爆炸驱动亚毫米级金属颗粒群的飞散特性[J]. 高压物理学报, 2019, 33(6): 065104. doi: 10.11858/gywlxb.20190741
引用本文: 冯吉奎, 皮爱国, 刘源, 景莹琳. 爆炸驱动亚毫米级金属颗粒群的飞散特性[J]. 高压物理学报, 2019, 33(6): 065104. doi: 10.11858/gywlxb.20190741
FENG Jikui, PI Aiguo, LIU Yuan, JING Yinglin. Scattering Characteristics of Sub-Millimeter Metal Particle Group Driven by Explosion[J]. Chinese Journal of High Pressure Physics, 2019, 33(6): 065104. doi: 10.11858/gywlxb.20190741
Citation: FENG Jikui, PI Aiguo, LIU Yuan, JING Yinglin. Scattering Characteristics of Sub-Millimeter Metal Particle Group Driven by Explosion[J]. Chinese Journal of High Pressure Physics, 2019, 33(6): 065104. doi: 10.11858/gywlxb.20190741

爆炸驱动亚毫米级金属颗粒群的飞散特性

doi: 10.11858/gywlxb.20190741
详细信息
    作者简介:

    冯吉奎(1993-),男,硕士,主要从事结构与冲击动力学研究. E-mail: 18810998871@163.com

    通讯作者:

    皮爱国(1977-),男,博士,副教授,主要从事爆炸冲击研究. E-mail: aiguo_pi@bit.edu.cn

  • 中图分类号: O347.1; TJ55

Scattering Characteristics of Sub-Millimeter Metal Particle Group Driven by Explosion

  • 摘要: 采用试验与数值模拟相结合的方法,研究了爆炸驱动下亚毫米级WC颗粒群的飞散特性及其影响因素。首先对重金属嵌层碳纤维复合材料(CFRP)壳体开展静爆试验研究,测得距爆心一定距离处颗粒速度;然后基于离散元方法(DEM),依据实体情况对WC颗粒层的颗粒进行无序建模与数值模拟,分析了颗粒无序排列时不同颗粒、装填比及长径比对颗粒速度的影响规律。结果表明:在相同装填比下,颗粒粒径越大,单个颗粒所获得的速度越小;端部附近内外层颗粒速度相同,相对轴向位置X/L=0.62附近速度差最大;长径比在0.5~1.5范围内时,随着长径比的增加,颗粒的速度及速度差增大,起爆端相对于非起爆端颗粒速度增加较小。

     

  • 图  颗粒速度测试装置原理图

    Figure  1.  Schematic diagram of particle velocity test device

    图  战斗部结构

    Figure  2.  Warhead structure

    图  试验现场布局

    Figure  3.  Experimental field arrangement

    图  不同时刻颗粒飞散图

    Figure  4.  Particle scattering diagram at different times

    图  距爆心不同位置处颗粒速度历史

    Figure  5.  Velocity history of particle at different distance away from the charge center

    图  颗粒速度-相对轴向位置曲线

    Figure  6.  Particle velocity vs. relative axial position curve

    图  试验和理论公式计算得到的颗粒速度-位移曲线

    Figure  7.  Particle velocity vs. displacement obtained from experiments and empirical formula

    图  内外层颗粒初速与相对轴向位置关系

    Figure  8.  Initial velocity of inner and outer particles vs. relative axial position

    图  不同装填比颗粒初速与相对轴向位置的关系

    Figure  9.  Particle initial velocity vs. relative axial position under different filling ratios of charge

    图  10  不同长径比颗粒初速与相对轴向位置的关系

    Figure  10.  Initial particle velocity vs. relative axial position for different aspect ratios of charge

    表  1  装药参数

    Table  1.   Charge parameters

    $ \rho $/(g·cm−3)R/mmL/mmCFRP thickness/mmThickness of particle layer/mm
    Inner caseOuter case
    1.692050233
    下载: 导出CSV

    表  2  试验结果

    Table  2.   Experimental results

    No.DistanceMeasured velocity/(m·s–1)Fixed velocity/(m·s–1)
    137.5d705757
    240.0d685743
    362.5d635697
    下载: 导出CSV

    表  3  钨颗粒参数设置

    Table  3.   Parameters of tungsten particle

    $ \rho $/(g·cm–3)G/GPaA/GPaB/GPaNCMTM/KTR/K${ {{\dot \varepsilon }_0}}$/s–1cp/(J·g-1·K-1)
    17.62501.371.51×10–20.120.0161.01 4982941.01.35×10–3
    PCSpallITD1D2D3D4D5c0/(m·s–1)S1${\gamma_0}$
    –1.753.00.02.01.77–3.4003 8001.441.58
    下载: 导出CSV

    表  4  空气的状态方程参数

    Table  4.   Equation-of-state parameters of air

    $ \rho $/(g·cm–3)${C_0}$${C_1}$${C_2}$${C_3}$${C_4}$${C_5}$${C_6}$
    1.293×10–300000.40.40
    下载: 导出CSV

    表  5  炸药的JWL状态方程参数

    Table  5.   JWL equation-of-state parameters of explosive

    $ \rho $/(g·cm–3)AE/GPaBE/GPaR1R2$ \omega $pCJ/GPaDCJ/(m·s–1)e0/GPa
    1.69669.912.9014.31.20.3368 60010
    下载: 导出CSV

    表  6  炸药爆炸驱动不同颗粒的初速

    Table  6.   Maximum driving speed of different particles

    Granularity/mm$ \rho $/(g·cm–3)vmax/(m·s–1)Average velocity/(m·s–1)
    0.217.61 2491 060
    0.517.6984823
    0.717.6806686
    0.519.3574476
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-03-14
  • 修回日期:  2019-04-01
  • 发布日期:  2019-10-25

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