应力波在散体颗粒中的传播规律

王秉相 程普锋 郑宇轩 周风华

王秉相, 程普锋, 郑宇轩, 周风华. 应力波在散体颗粒中的传播规律[J]. 高压物理学报, 2020, 34(4): 044202. doi: 10.11858/gywlxb.20200508
引用本文: 王秉相, 程普锋, 郑宇轩, 周风华. 应力波在散体颗粒中的传播规律[J]. 高压物理学报, 2020, 34(4): 044202. doi: 10.11858/gywlxb.20200508
WANG Bingxiang, CHENG Pufeng, ZHENG Yuxuan, ZHOU Fenghua. Attenuation Law of Stress Wave in Granular Particles[J]. Chinese Journal of High Pressure Physics, 2020, 34(4): 044202. doi: 10.11858/gywlxb.20200508
Citation: WANG Bingxiang, CHENG Pufeng, ZHENG Yuxuan, ZHOU Fenghua. Attenuation Law of Stress Wave in Granular Particles[J]. Chinese Journal of High Pressure Physics, 2020, 34(4): 044202. doi: 10.11858/gywlxb.20200508

应力波在散体颗粒中的传播规律

doi: 10.11858/gywlxb.20200508
基金项目: 国家自然科学基金(11390361)
详细信息
    作者简介:

    王秉相(1995-),男,硕士研究生,主要从事冲击动力学研究. E-mail:wbxbob@163.com

    通讯作者:

    郑宇轩(1986-),男,博士,副教授,主要从事冲击动力学研究. E-mail:zhengyuxuan@nbu.edu.cn

  • 中图分类号: O347.4

Attenuation Law of Stress Wave in Granular Particles

  • 摘要: 脆性散体颗粒在受到冲击加载时,会对应力波传播产生显著的衰减作用。基于离散元颗粒流软件PFC3D建立了散体颗粒模型,通过不同加载速率下的数值模拟,研究应力波在散体颗粒中的传播规律和影响因素。结果表明:在冲击加载下,散体颗粒中传播的应力波峰值整体呈指数型衰减,随着传播距离的增大,应力波衰减程度逐渐减小,颗粒破碎程度也逐渐减小;应力波在散体颗粒中传播时会发生显著的波形弥散,并且应力波波长越短,传播过程中的衰减越大;应力波衰减的率相关性本质上是由散体颗粒的冲击破碎引起的,加载速度越大,颗粒破坏程度越大,应力波的衰减程度越大,而在颗粒不破碎的情况下,加载速度增大时,应力波的衰减程度变化不明显。

     

  • 图  簇颗粒的生成过程

    Figure  1.  Generation process of cluster particle

    图  石英砂压缩曲线

    Figure  2.  Compression curve of quartz sand

    图  散体颗粒模型及测量球位置

    Figure  3.  Particle model and positions of the measurement balls

    图  试件不同位置的应力波波形

    Figure  4.  Stress wave forms at different positions of the test piece

    图  不同直径的测量球对应力波衰减的影响

    Figure  5.  Effect of measuring ball diameter on the attenuationof stress waves

    图  应力波衰减规律及颗粒破碎

    Figure  6.  Attenuation law of the stress wave and the image of particle fragmentation

    图  不同区域拟合曲线无量纲传播距离

    Figure  7.  Dimensionless propagation distance of fitted curves in different regions

    图  应力波在颗粒破碎/不破碎时的衰减规律

    Figure  8.  Attenuation laws of stress wave when particles are broken/unbroken

    图  颗粒破碎程度随衰减因子β的变化曲线

    Figure  9.  Degree of particle fragmentation with respect to the attenuation factor β

    图  10  不同脉宽的应力波传播规律

    Figure  10.  Propagation of stress waves with different pulse widths

    图  11  不同脉宽的应力波峰值拟合曲线

    Figure  11.  Curves of stress wave peaks with different pulse widths

    图  12  不同加载速度下可破碎颗粒的峰值应力拟合曲线

    Figure  12.  Peak stress fitting curves of the crushable particlesat different loading velocities

    图  13  不同加载速度下不可破碎颗粒的峰值应力拟合曲线

    Figure  13.  Peak stress fitting curves of the uncrushable particlesat different loading velocities

    图  14  衰减因子、黏结键破碎比与加载速度的关系

    Figure  14.  Relationship between attenuation factor, bond breaking ratio and loading velocity

    表  1  Flat-Joint模型微观参数

    Table  1.   Micro-parameters of the Flat-Joint model

    ModelEmod/GPaFj-Kn/GPaFj-Ks/GPaFj-Coh/GPaFj-Ten/GPaDamp
    Flat-Joint505.25 × 1059.37 × 1050.20.050.15
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  • 收稿日期:  2020-02-10
  • 修回日期:  2020-03-19

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