脆性膨胀环动态拉伸碎裂实验研究

汤佳妮; 徐便; 郑宇轩; 周风华

doi:10.11883/bzycj-2020-0049

脆性膨胀环动态拉伸碎裂实验研究

doi: 10.11883/bzycj-2020-0049

汤佳妮^1,,
徐便¹,
郑宇轩^{1, 2, ,},
周风华¹

1.
宁波大学冲击与安全工程教育部重点实验室，浙江宁波 315211
2.
中国工程物理研究院流体物理研究所冲击波物理与爆轰物理重点实验室，四川绵阳 621999

基金项目: 国家自然科学基金重点项目（11932018）；国防科技重点实验室基金项目（6142A03191004）

详细信息

作者简介:
汤佳妮（1995－　），女，硕士研究生，tang1042227668@foxmail.com

通讯作者:
郑宇轩（1986－　），男，博士，副教授，zhengyuxuan@nbu.edu.cn

中图分类号: O383; O346.1
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- 被引次数: 0
出版历程
- 收稿日期: 2020-02-28
- 修回日期: 2020-06-29
- 刊出日期: 2021-01-05

Experimental study for dynamic fragmentation of brittle expansion rings

TANG Jiani^1
,,
XU Bian¹,
ZHENG Yuxuan^{1, 2
, ,},
ZHOU Fenghua¹

1.
MOE Key Laboratory of Impact and Safety Engineering, Ningbo University, Ningbo 315211, Zhejiang, China
2.
National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

摘要

摘要: 发展了一种液压冲击脆性膨胀环实验技术，通过可升降的凸台对脆性膨胀环进行精确的对心定位安置，避免偏心膨胀带来的弯曲断裂，通过膨胀环试件上的半导体应变片测量其在拉伸碎裂过程中的应变时程曲线；对典型脆性材料碳化硅（SiC）陶瓷进行了膨胀拉伸碎裂实验研究，获得了其动态拉伸断裂强度和碎片平均尺寸及分布。实验结果表明：(1) 液压冲击膨胀环实验能较好地实现脆性膨胀环的拉伸碎裂，在应变率10¹ s⁻¹量级下，SiC陶瓷拉伸断裂应变为3.7×10⁻⁴～7.4×10⁻⁴，平均拉伸断裂应力为206 MPa；(2) SiC陶瓷无量纲化平均碎片尺寸落于多种脆性碎裂预测模型的合理区间内，随着加载应变率的提高，SiC陶瓷的平均碎片尺寸减小；(3) SiC陶瓷拉伸碎裂的碎片分布基本符合Rayleigh分布，但是在细小尺寸上和大尺寸碎片分布上存在一定偏差。
- 液压膨胀 /
- SiC陶瓷 /
- 脆性碎裂 /
- 碎片尺寸 /
- 碎片分布
Abstract: A liquid-driving brittle expansion ring test technique has been developed. The precise centering of the brittle ring was realized by means of a liftable convex platform to avoid the bending fracture caused by eccentric expansion. The strain vs time curves in the process of tensile fracture were measured by the semiconductor strain gauges on the expansion ring. Then expansion tensile fracture experiments of silicon carbide (SiC) ceramics were carried out, and their dynamic tensile fracture strength and average size and distribution of fragments were obtained. The experimental results show as follows. (1) The liquid-driving expansion ring experiment can better achieve the tensile fracture of the ceramic material. At a strain rate of 10¹ s⁻¹, the tensile fracture strain of SiC ceramic is 3.7×10⁻⁴−7.4×10⁻⁴, and the average tensile fracture stress is 206 MPa. (2) The dimensionless average fragment size of SiC ceramic falls within the reasonable interval of various brittle fracture prediction models. With the increase of loading strain rate, the average fragment size of SiC ceramic decreases. (3) The fragment distribution of SiC ceramic tensile fracture basically conforms to the Rayleigh distribution, but there are some deviations in the fine size and large size fragment distribution.
- liquid-driving expansion /
- SiC ceramics /
- brittle fracture /
- fragment size /
- fragment distribution

HTML全文

图 1 液压膨胀环实验装置

Figure 1. Liquid-driving expansion ring setup

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图 2 无效的陶瓷圆环试件的周向应变时程曲线

Figure 2. Illogical circumferential strain profiles of SiC rings

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图 3 陶瓷圆环试件的周向应变时程曲线

Figure 3. Circumferential strain profiles of SiC rings

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图 4 回收的SiC试件碎片复原图

Figure 4. Fragments of SiC specimen after the expanding ring tests

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图 5 无量纲化碎片尺寸与应变率的关系-实验结果与现有研究^{[15-19, 21, 23, 25-26]}比较

Figure 5. Comparison of experimental data and other research results^{[15-19, 21, 23, 25-26]} of brittle fragment size

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图 6 碎片尺寸分布

Figure 6. Distributions of fragment size

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图 7 碎片的归一化积累分布与Rayleigh分布函数的比较

Figure 7. Comparison of cumulative distribution of normalized fragment size to the Rayleigh distribution function

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