冲击载荷下脆性空心颗粒破碎机理

范志强 何天明 刘迎彬 索涛 徐鹏

范志强, 何天明, 刘迎彬, 索涛, 徐鹏. 冲击载荷下脆性空心颗粒破碎机理[J]. 爆炸与冲击, 2021, 41(7): 073302. doi: 10.11883/bzycj-2020-0247
引用本文: 范志强, 何天明, 刘迎彬, 索涛, 徐鹏. 冲击载荷下脆性空心颗粒破碎机理[J]. 爆炸与冲击, 2021, 41(7): 073302. doi: 10.11883/bzycj-2020-0247
FAN Zhiqiang, HE Tianming, LIU Yingbin, SUO Tao, XU Peng. Breaking mechanisms of brittle hollow particles under impact loading[J]. Explosion And Shock Waves, 2021, 41(7): 073302. doi: 10.11883/bzycj-2020-0247
Citation: FAN Zhiqiang, HE Tianming, LIU Yingbin, SUO Tao, XU Peng. Breaking mechanisms of brittle hollow particles under impact loading[J]. Explosion And Shock Waves, 2021, 41(7): 073302. doi: 10.11883/bzycj-2020-0247

冲击载荷下脆性空心颗粒破碎机理

doi: 10.11883/bzycj-2020-0247
基金项目: 国家自然科学基金(11602233,11802274);山西省应用基础研究计划(201701D221018);山西省高校科技创新项目(2019-520)
详细信息
    作者简介:

    范志强(1989- ),男,博士,副教授,fanzhq@nuc.edu.cn

  • 中图分类号: O347.4

Breaking mechanisms of brittle hollow particles under impact loading

  • 摘要: 为考察脆性空心颗粒在冲击载荷作用下的应变率效应和破碎行为的细观机理,以粉煤灰漂珠为研究对象,基于低速冲击实验和有限元数值模拟,对比了典型空心颗粒材料在不同加载速率下的力学响应特性和细观压溃行为,阐释了材料宏观应变率效应产生的细观机理,获得以下结果。(1)在0.001~300 s−1应变率范围,漂珠颗粒的破碎率和Hardin破碎势平均提升了约21%和10%~30%,材料比吸能提升了50%~125%,比吸能的额外增加主要与动态颗粒滑移产生的摩擦耗能相关。颗粒平均尺寸较大的试样体现出更强的应变率效应。(2)初始压溃阶段的应力应变响应特征的数值模拟结果与实验结果较吻合,低速冲击下动态二次压溃现象产生的细观机理为动态颗粒滑移和压紧行为对加载速率的依赖性。(3) 数值模拟表明,冲击加载下产生相同应变时颗粒的损伤程度和范围大于准静态加载,这与实验所得破碎势随应变率增加的结果一致。对比低速冲击实验的相对破碎势分析和细观数值模拟结果可知,脆性颗粒堆积材料在动态冲击下表现出的宏观应变率效应主要归因于颗粒压溃行为的率敏感性和动态加载下颗粒破碎能量利用率的降低。
  • 图  1  实验装置和单次加载实验验证

    Figure  1.  Experimental facility and verification of single-impact experiment

    图  2  有限元模型和BCC单胞

    Figure  2.  Finite element model and BCC unit cell

    图  3  LCPs准静态压缩力学响应

    Figure  3.  Response of LCPs under quasi-static compression

    图  4  LCPs在5 m/s速度下的冲击响应

    Figure  4.  Impact response of LCPs at 5 m/s

    图  5  不同加载速率下试样的应力应变曲线

    Figure  5.  Stress-strain curves of specimens at different loading rates

    图  6  强度和比吸能的应变率效应

    Figure  6.  Dependence of strength and specific energy absorption on strain rate

    图  7  不同应变率下颗粒破碎特性分析

    Figure  7.  Analysis on particle breaking characteristics at different strain rates

    图  8  相对破碎势随应变率的变化

    Figure  8.  Variation of relative breaking potential with strain rate

    图  9  数值模拟和实验的应力应变曲线

    Figure  9.  Simulated and experimental stress-strain curves

    图  10  不同冲击载荷下典型颗粒压溃过程

    Figure  10.  Typical crushing process of particles subject under different impact loading conditions

    图  11  颗粒强度和加载速率对材料初始压溃行为的影响

    Figure  11.  Influences of particle strength and loading rate on initial crushing behavior

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出版历程
  • 收稿日期:  2020-07-17
  • 修回日期:  2020-09-09
  • 网络出版日期:  2021-06-30
  • 刊出日期:  2021-07-05

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