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

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

魏久淇^{1, 2,},
张春晓^{1, 2, ,},
曹少华^{1, 2},
王世合^{1, 2},
李磊^{1, 2}

1.
军事科学院国防工程研究院工程防护研究所，河南洛阳 471023
2.
河南省特种防护材料重点实验室，河南洛阳 471023

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
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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

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

WEI Jiuqi^{1, 2
,},
ZHANG Chunxiao^{1, 2
, ,},
CAO Shaohua^{1, 2},
WANG Shihe^{1, 2},
LI Lei^{1, 2}

1.
Institute of Engineering Protection, IDE, AMS, PLA, Luoyang 471023, Henan, china
2.
Henan Key Laboratory of Special Protective Materials, Luoyang 471023, Henan, China

摘要

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。
- 散体材料 /
- SHPB试验 /
- 体应力 /
- 折算系数
Abstract: Aiming to overcome the disadvantages and demerits in the stress calculation in the passive confinement pressure SHPB tests of granular materials, a numerical modified approach is proposed in the present paper. The modified approach is also verified by finite element numerical simulation and experimental results. The results show that when the length of specimen is much shorter than the length of thick-walled hollow cylinder, the edge effects will lead to a non-uniform distribution of deformation along the length of hollow cylinder. Therefore, the configuration of thick-walled cannot be simplified as a plain stress problem when calculating the stress and deformation state of granular material. Due to the fact that the thick-walled hollow cylinder is elastic, the real radial stress in the hollow cylinder is proportional to the theoretical predictions. The proportionality coefficient has a quadratic function relation with the length of specimen.
- granular materials /
- SHPB test /
- volume stress /
- conversion coefficient

HTML全文

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

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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

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图 3 阶梯型套筒^[15]

Figure 3. Ladder sleeve^[15]

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图 4 厚壁圆筒受力分析

Figure 4. Force analysis of thick-walled cylinder

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图 5 厚壁圆筒模型

Figure 5. Thick-walled cylinder model

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图 6 径向力${\sigma _{\rm{ss}}}$时程曲线

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

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图 7 应变公式值（ε_c）与数值计算值（ε_s(L_c, L_s)）的对比

Figure 7. Comparison diagram between strain by fomula (ε_c) and that by simulation (ε_s(L_c, L_s))

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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

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图 9 验证性模拟

Figure 9. Verification simulation

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图 10 试验砂样

Figure 10. Sand specimens tested

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图 11 砂样颗粒级配曲线

Figure 11. Grain size distribution

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图 12 试验设备

Figure 12. Test equipment

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图 13 试验原始波形

Figure 13. Test the original waveform

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图 14 砂样动态应力平衡

Figure 14. Dynamic stress equilibrium in the sand specimens

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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

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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	25	13.90	10.02	1.29	58.73	0.2
G60-0.2-02		25		10.00	1.29	60
G60-0.2-03		25		9.98	1.30	61.31
G60-0.2-04		30		10.02	1.29	58.73
G60-0.2-05		30		10.00	1.29	60
G60-0.2-06		30		10.02	1.29	58.73

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