SHPB帽形试样尺寸效应研究

肖大武; 马策; 何立峰

doi:10.11883/1001-1455(2016)01-0064-05

SHPB帽形试样尺寸效应研究

doi: 10.11883/1001-1455(2016)01-0064-05

中国工程物理研究院材料研究所, 四川江油 621908

详细信息

作者简介:
肖大武(1983-)，男，博士，副研究员，hopkinson@163.com

中图分类号: O347
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- 被引次数: 6
出版历程
- 收稿日期: 2013-11-11
- 修回日期: 2014-01-25
- 刊出日期: 2016-01-25

Dimensional effects of hat-shaped specimen in Hopkinson bar test

Institute of Materials, China Academy of Engineering Physics, Jiangyou 621908, Sichuan, China

摘要

摘要: 利用ANSYS/LS-DYNA软件开展不同尺寸帽形试样的SHPB数值模拟，研究帽形试样的尺寸效应。结果表明，当帽形试样剪切变形区域宽度大于0.2 mm时，根据经典公式处理得到的应力值将随t的增大而显著增大, 严重偏离理论值，当t=1.0 mm时，计算得到的应力值甚至接近理论值的2倍。采用分体模型进行的进一步计算表明，数据处理结果中应力偏差主要来源于帽形试样中环状部位的膨胀变形。提出改进的数据处理方法，并采用圆柱样与几种不同尺寸帽形试样开展了验证实验，结果与计算结果基本一致。
- 固体力学 /
- 尺寸效应 /
- ANSYS/LS-DYNA软件 /
- 帽形试样 /
- SHPB
Abstract: Numerical Hopkinson bar experiments of hat-shaped specimens with different geometries were carried out using ANSYS/LS-DYNA to investigate the effects resulting from varying the geometrical dimensions of specimens. Results show that the stress value calculated by the classic formula deviated drastically from the theoretical value, when the width t the of shear zone was larger than 0.2 mm. When the width t was 1.0 mm, the calculated stress value would even rise up to twice as much as close to the theoretical value. Further research with the split model revealed that the deviation of the stress mainly occurred as a result from the expansion deformation of the brim portion of the hat-shaped specimen. An improved method of data processing for the hat-shaped specimen was also presented based on the numerical simulation results. Finally, the method was also validated by SHPB experiments with cylinder specimens and hat-shaped specimens with different dimensions.
- solid mechanics /
- geometry effect /
- ANSYS/LS-DYNA /
- hat-shaped specimen /
- SHPB

HTML全文

图 1 帽形试样示意图

Figure 1. Schematic of hat-shaped specimen

下载: 全尺寸图片幻灯片

图 2 帽形试样网格划分图

Figure 2. Grid partition of hat-shaped specimen

下载: 全尺寸图片幻灯片

图 3 不同尺寸帽形试样计算结果^[3]与J-C模型对比图

Figure 3. Comparison of calculation between simulation^[3] and J-C model

下载: 全尺寸图片幻灯片

图 4 分体模型示意图

Figure 4. Schematic of the split model

下载: 全尺寸图片幻灯片

图 5 分体模型膨胀载荷分析

Figure 5. Calculation of the expansion load in split model

下载: 全尺寸图片幻灯片

图 6 帽形试样应变分布云图

Figure 6. Contour graph of strain in hat-shaped specimen

下载: 全尺寸图片幻灯片

图 7 不同公式处理的得到的应力应变曲线对比

Figure 7. Comparison of stress-strain curves calculated by different formula

下载: 全尺寸图片幻灯片

表 1 帽形试样几何尺寸

Table 1. Physical dimensions of the hat-shaped specimens

r₁/mm	r₂/mm	r₃/mm	h₁/mm	h₂/mm	h₃/mm	t/mm
3.0	2.8	5.0	3.5	5.0	8.0	0.2
3.0	2.5	5.0	3.5	5.0	8.0	0.5
3.0	2.0	5.0	3.5	5.0	8.0	1.0

下载: 导出CSV

表 2 应力、应变表达式形状相关参数

Table 2. The geometry-related parameters in stress and strain expressions

k₁	k₂	k₃	k₁	k₂	k₃
t=0.5 mm			t=1.0 mm
1.224	0	0.868	0.767	0.198	0.657

下载: 导出CSV

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