不同加载速度下脆性颗粒的破坏特性

易洪昇; 徐松林; 单俊芳; 张鸣

doi:10.11883/1001-1455(2017)05-0913-10

不同加载速度下脆性颗粒的破坏特性

doi: 10.11883/1001-1455(2017)05-0913-10

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 11602267

国家自然科学基金项目 11472264

国家自然科学基金项目 11672286

国家自然科学基金项目 11272304

详细信息

作者简介:
易洪昇(1990-)，男，硕士研究生

通讯作者:
徐松林，slxu99@ustc.edu.cn

中图分类号: O383
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出版历程
- 收稿日期: 2015-12-23
- 修回日期: 2016-04-22
- 刊出日期: 2017-09-25

Fracture characteristics of brittle particles at different loading velocities

CAS Key Laboratory for Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230026, Anhui, China

摘要

摘要: 对直径为8mm的K9玻璃球进行了加载速度为2×10^-7和2×10^-6m/s的准静态单轴压缩实验以及加载速度为3.4、7.1和10.6m/s的动态单轴压缩实验，研究了K9玻璃单颗粒破碎强度的Weibull分布特性，结合破碎产物的形貌特征，分析了不同加载速度下脆性材料拉伸破坏机制和剪切破坏机制的转变过程，提出了一种拉剪耦合的时序破坏模型，由此揭示了加载速度与3个破坏区的关系。考虑拉伸和剪切失效准则，应用ABAQUS软件进行数值模拟，并初步验证了该破坏模型的冲击过程。研究结果对于认识脆性颗粒材料的动态破坏具有很好的参考意义。
- 动力学 /
- 脆性材料 /
- Weibull分布 /
- 拉剪耦合
Abstract: Uniaxial compression experiments of K9 glass spheres with a diameter of 8mm were conducted to obtain the fracture responses of brittle particles at five loading velocities, i.e.2×10^-7 and 2×10^-6m/s for quasi-static loading and 3.4, 7.1 and 10.6m/s for impact loading using a split Hopkinson pressure bar. Based on the Weibull distribution and recovery specimen products, a novel model combing the tensile failure and the shear failure was proposed to explain the process of the breaking evolution, revealing the relationship of the loading velocity and the three breaking zones. The model was validated using numerical simulation. Our study can serve as valuable reference for the study of the dynamic failure of brittle granular materials.
- dynamics /
- brittle material /
- Weibull distribution /
- tension-shear coupling

HTML全文

图 1 改进后的MTS装置局部

Figure 1. Modified parts of MTS device

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图 2 典型的轴向压力-位移曲线

Figure 2. Typical axial force-displacement curves

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图 3 SHPB装置示意图

Figure 3. Schematic diagram of SHPB setup

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图 4 动态实验的典型原始波形

Figure 4. Typical recorded waveforms of dynamic experiment

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图 5 试件冲击压缩破坏临界状态的确定

Figure 5. Determination of the critical state of the specimen failure

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图 6 不同加载速度下的Weibull分布统计

Figure 6. Weibull distribution at different impact velocities

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图 7 实验组S-1中的3种典型破碎特征

Figure 7. Three typical characteristics of experimental group S-1

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图 8 实验组S-1的破碎演变过程

Figure 8. Process of the breaking evolution of experimental group S-1

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图 9 冲击破碎演变过程

Figure 9. Process of the breaking evolution under impact loading

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图 10 K9玻璃球的SHPB实验产物和钠钙硅玻璃珠冲击平板实验产物^[17]

Figure 10. Product of K9 glass sphere in SHPB experiment and fragments of soda-lime glass sphere in particle impact experiments^[17]

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图 11 不同加载速度下玻璃球破碎演变流程图

Figure 11. Flow chart of the breaking evolution of glass sphere at different loading velocities

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图 12 Weibull特征破坏力与加载速度的关系

Figure 12. Weibull characteristic strength vs.impact velocity

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图 13 SHPB实验有限元模型

Figure 13. Finite element model of SHPB experiment

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图 14 玻璃球的剖面应力分布

Figure 14. Stress distribution on the profile of glass sphere

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表 1 Weibull分布的拟合参数

Table 1. Fitting parameters of Weibull distribution

实验组	n	v/(m·s^-1)	m	σ₀/MPa	r
S-1	24	2×10^-7	7.52	44.18	0.946
S-2	28	2×10^-6	2.82	54.13~69.02	0.862
D-1	24	3.4	9.01	79.50	0.926
D-2	24	7.1	7.05	114.85	0.945
D-3	24	10.6	6.17	123.91	0.980

下载: 导出CSV

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