一种散体材料SHPB被动围压试验体应力修正方法

魏久淇 张春晓 曹少华 王世合 李磊

魏久淇, 张春晓, 曹少华, 王世合, 李磊. 一种散体材料SHPB被动围压试验体应力修正方法[J]. 爆炸与冲击, 2020, 40(12): 124201. doi: 10.11883/bzycj-2019-0411
引用本文: 魏久淇, 张春晓, 曹少华, 王世合, 李磊. 一种散体材料SHPB被动围压试验体应力修正方法[J]. 爆炸与冲击, 2020, 40(12): 124201. doi: 10.11883/bzycj-2019-0411
WEI Jiuqi, ZHANG Chunxiao, CAO Shaohua, WANG Shihe, LI Lei. A volume stress correction method for SHPB passiveconfined pressure of granular materials[J]. Explosion And Shock Waves, 2020, 40(12): 124201. doi: 10.11883/bzycj-2019-0411
Citation: WEI Jiuqi, ZHANG Chunxiao, CAO Shaohua, WANG Shihe, LI Lei. A volume stress correction method for SHPB passiveconfined pressure of granular materials[J]. Explosion And Shock Waves, 2020, 40(12): 124201. doi: 10.11883/bzycj-2019-0411

一种散体材料SHPB被动围压试验体应力修正方法

doi: 10.11883/bzycj-2019-0411
详细信息
    作者简介:

    魏久淇(1990- ),男,硕士,工程师,weijiuqi61489@163.com

    通讯作者:

    张春晓(1980- ),男,硕士,副研究员,cxz_007@163.com

  • 中图分类号: O341; O344

A volume stress correction method for SHPB passiveconfined pressure of granular materials

  • 摘要: 本文利用有限元仿真给出了一种修正方法,并用数值仿真和试验验证了该方法的可靠性。研究表明:散体材料SHPB被动围压试验中,试样厚度远小于厚壁圆筒长度时,端部效应会导致厚壁圆筒不均匀凸出变形,计算材料的体应力-应变关系不能将厚壁圆筒应力状态简化为平面应力问题;厚壁圆筒处于弹性状态下,通过厚壁圆筒理论计算出的径向力与真实径向力存在一定比例关系,在一定范围内,折算系数与试样实时厚度呈二次函数关系。
  • 图  1  散体材料受约束的几何结构

    Figure  1.  Geometric structure constrained by SHPB test for bulk material

    图  2  试验时厚壁圆筒的几何变形图

    Figure  2.  Geometric deformation diagram of thick-walled cylinder in test

    图  3  阶梯型套筒[15]

    Figure  3.  Ladder sleeve[15]

    图  4  厚壁圆筒受力分析

    Figure  4.  Force analysis of thick-walled cylinder

    图  5  厚壁圆筒模型

    Figure  5.  Thick-walled cylinder model

    图  6  径向力${\sigma _{\rm{ss}}}$时程曲线

    Figure  6.  Time-history curve of radial force ${\sigma _{\rm{ss}}}$

    图  7  应变公式值(εc)与数值计算值(εs(Lc, Ls))的对比

    Figure  7.  Comparison diagram between strain by fomula (εc) and that by simulation (εs(Lc, Ls))

    图  8  折算系数与试样实时厚度的关系图

    Figure  8.  relation diagram between conversion coefficient and real-time thickness of samples

    图  9  验证性模拟

    Figure  9.  Verification simulation

    图  10  试验砂样

    Figure  10.  Sand specimens tested

    图  11  砂样颗粒级配曲线

    Figure  11.  Grain size distribution

    图  12  试验设备

    Figure  12.  Test equipment

    图  13  试验原始波形

    Figure  13.  Test the original waveform

    图  14  砂样动态应力平衡

    Figure  14.  Dynamic stress equilibrium in the sand specimens

    图  15  含水率25%、30%钙质砂的应力应变

    Figure  15.  Stress and strain of calcareous sand with 25%, 30% water content

    表  1  试验工况表

    Table  1.   Summary of SHPB tests

    编号试验材料含水率/%砂质量/g装样厚度/mm干密度/(g∙cm−3)相对密实度/%气压/MPa
    G60-0.2-01钙质砂2513.9010.021.2958.730.2
    G60-0.2-022510.001.2960
    G60-0.2-0325 9.981.3061.31
    G60-0.2-043010.021.2958.73
    G60-0.2-053010.001.2960
    G60-0.2-063010.021.2958.73
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出版历程
  • 收稿日期:  2019-10-24
  • 修回日期:  2020-01-19
  • 刊出日期:  2020-12-05

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