一种基于SHPB的冲击膨胀环实验技术

郑宇轩; 周风华; 胡时胜

doi:10.11883/1001-1455(2014)04-0483-06

一种基于SHPB的冲击膨胀环实验技术

doi: 10.11883/1001-1455(2014)04-0483-06

郑宇轩^{1, 2},
周风华^1, ,,
胡时胜²

1.
宁波大学教育部冲击与安全工程重点实验室，浙江宁波 315211
2.
中国科学技术大学中国科学院材料力学行为和设计重点实验室，安徽合肥 230026

基金项目: 国家自然科学基金项目(10972108)

详细信息

作者简介:
郑宇轩(1986—), 男, 博士研究生

中图分类号: O346.1
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- 被引次数: 9
出版历程
- 收稿日期: 2012-09-24
- 修回日期: 2013-01-22
- 刊出日期: 2014-07-25

An SHPB-based experimental technique for dynamic fragmentations of expanding rings

1.
MOE Key Laboratory of Impact and Safety Engineering, Ningbo University, Ningbo 315211, Zhejiang, China
2.
CAS Key Laboratory for Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230026, Anhui, China

Funds: Supported bythe National Natural Science Foundation of China (10972108)

More Information

Corresponding author: Zhou Feng-hua, zhou@nbu.edu.cn

摘要

摘要: 设计了一种基于分离式Hopkinson压杆(SHPB)的冲击膨胀环实验装置，实验装置包括一个液压腔，一侧为驱动活塞，另一侧为圆环试件封闭。对活塞施加轴向冲击，利用液体体积近似不可压缩的特性，通过液压腔截面积的大比例缩小，将较低速度的对活塞冲击转化为圆环试件沿径向的高速膨胀，驱动试件发生拉伸变形直至断(碎)裂。使用这种冲击膨胀装置，获得了LY12铝环在不同撞击速度下碎裂过程的初步结果。实验结果显示，随着撞击速度增大，圆环试件碎裂产生的碎片的尺度减小，试件的表观断裂应变增加。这为研究材料的动态拉伸碎裂问题提供了一种加载方式。
- 固体力学 /
- 动态拉伸 /
- SHPB /
- 膨胀环 /
- 碎裂 /
- 表观断裂应变
Abstract: Based on the split Hopkinson pressure bar (SHPB), a new loading experimental technology was developed for conducting expanding ring test which is used to study the dynamic tensile deformation and the fracture (fragmentation) properties of materials. The loading fixture includes a hydraulic cylinder filled with incompressible fluid, which is pushed by a piston connected to the input bar. As the liquid is driven, it expands the metallic ring specimen in the radial direction. The approximately incompressible property of the liquid makes it possible to drive the specimen in very high radial velocity by low velocity movement of piston, according to the large sectional area ratio of the cylinder to specimen. The ring specimens of LY12 aluminum alloy were tested by this experimental technology. The results show apparent increase of the fragment number and the fracture strain of the specimen with the increase of the impact velocity.
- solid mechanics /
- expanding ring /
- SHPB /
- dynamic tension /
- fragmentation /
- apparent fracture strain

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图 1 冲击膨胀环加载装置

Figure 1. Equipment for loading expanding rings

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图 2 有限元模拟示意图

Figure 2. Schematic of FEM simulation

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图 3 安装在SHPB系统上的冲击膨胀环实验装置示意图

Figure 3. Schematic diagram of the impact loading fixture installed between SHPB

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图 4 实验回收的铝合金环碎片

Figure 4. Recovered aluminum ally fragments after testing

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图 5 碎片断裂形貌分析

Figure 5. Form of the fragments after testing

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图 6 平均碎片尺寸随撞击速度的变化规律

Figure 6. Average fragment size under different impact velocity

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图 7 平均断裂应变随撞击速度的变化规律

Figure 7. Average fracture strain under different impact velocity

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表 1 铝合金环动态拉伸实验数据

Table 1. Data obtained from the dynamic tensile experiment of auminium alloy

实验	v₀/(m·s^-1)	n	l/mm
1	10.8	2	57.0
2	11.0	2	56.8
3	10.9	4	60.8
4	14.1	4	62.6
5	16.1	4	59.0
6	16.8	3	62.9
7	21.5	6	68.0
8	22.1	5	64.9
9	21.7	6	66.8
10	25.2	7	71.7
11	25.7	8	71.1
12	25.5	8	62.4
13	31.6	7	72.4
14	35.1	8	78.9

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