应变速率对海泡石的动态力学性能影响研究

徐长锋; 周友行; 宋佳林; 肖雨琴; 何东柯; 张扬扬

doi:10.13433/j.cnki.1003-8728.20200469

应变速率对海泡石的动态力学性能影响研究

doi: 10.13433/j.cnki.1003-8728.20200469

徐长锋^1,,
周友行^{1, 2, ,},
宋佳林¹,
肖雨琴¹,
何东柯¹,
张扬扬¹

1.
湘潭大学机械工程学院, 湖南湘潭 411105
2.
复杂轨迹加工工艺及装备教育部工程研究中心, 湖南湘潭 411105

基金项目:

国家自然科学基金项目 51775468

湖南省教育厅科技研究项目 20A505

详细信息

作者简介:
徐长锋(1991-), 硕士研究生, 研究方向为非金属矿物加工, xcf927@126.com

通讯作者:
周友行, 教授, 博士生导师, zhouyouhang@xtu.edu.cn

中图分类号: O382
计量
- 文章访问数: 60
- HTML全文浏览量: 28
- PDF下载量: 9
- 被引次数: 0
出版历程
- 收稿日期: 2020-09-28
- 刊出日期: 2022-06-25

Research on Influence of Strain Rate on Dynamic Mechanical Properties of Sepiolite

1.
School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, Hu′nan, China
2.
The Ministry of Education, Engineering Research Center of Complex Tracks Processing Technology and Equipment Xiangtan University, Xiangtan 411105, Hu′nan, China

摘要

摘要: 海泡石矿粉常采用机械冲击破碎方法制备, 粗矿石受到的应变速率不同会导致破碎程度不一致。为了研究应变速率对海泡石动态力学性能影响, 采用分离式霍普金森压杆(SHPB)对海泡石在五种不同应变速率下进行动态压缩试验。结果表明: 海泡石的动态抗压强度、弹性模量以及破碎特性均表现出明显的应变速率效应。动态抗压强度随应变速率的增加呈线性增长; 动态弹性模量随应变速率的增加呈指数增长; 随着应变速率的增加, 破碎形态由劈裂转为压碎, 应变速率越高压碎后的海泡石碎块尺寸越小且粉末增多。
- 海泡石 /
- 应变速率 /
- 动态抗压强度 /
- 动态弹性模量 /
- 破碎特性
Abstract: Sepiolite ore powder is often prepared by mechanical impact crushing method, and the different strain rate of coarse ore compressed will lead to inconsistent crushing degree. In order to study the influence of strain rate on the mechanical properties of sepiolite, a Split Hopkinson Pressure Bar (SHPB) system was used to conduct dynamic compression tests on sepiolite specimens at five different strain rates. The results show that the dynamic compressive strength, the elastic modulus, and the failure characteristics of sepiolite show obvious strain rate effects. The dynamic compressive strength increases linearly with the increase of the strain rate; the dynamic elastic modulus increases with the increase of the strain rate; with the increase of strain rate, the failure mode changes from splitting failure to crushing failure. The higher the strain rate, the smaller the size of crushed pieces and the greater the amount of powder.
- sepiolite /
- strain rate /
- dynamic compressive strength /
- dynamic elastic modulus /
- failure characteristics

HTML全文

图 1 被夹持的试件

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图 2 加工完成后的试件

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图 3 海泡石的抗压和抗拉应力-位移曲线

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图 4 海泡石的应力-应变曲线

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图 5 海泡石在不同应变速率下的动态抗压强度

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图 6 不同岩石在不同应变速率下的动态抗压强度

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图 7 海泡石在不同应变速率下的动态弹性模量

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图 8 不同应变速率冲击载荷破碎后的海泡石试件

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表 1 海泡石的静态力学性能参数

抗压应力/MPa	抗拉应力/MPa	密度/(kg·m^-3)	硬度/HV
13.11	6.56	2 080	14

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表 2 海泡石试件SHPB试验结果

试样编号	直径D/mm	高度H/mm	冲击气压ρ/MPa	平均应变速率ε /s^-1	动态抗压强度σ/MPa	动态弹性模量E /MPa
0.6-2	37.78	23.06	0.05	269	24.8	416.11
0.6-5	37.81	23.11	0.1	356	34.0	601.18
0.6-7	37.85	23.24	0.15	395	41.7	641.74
0.6-14	37.93	23.15	0.2	409	46.2	780.40
0.6-15	37.88	23.02	0.25	430	50.6	1095.23

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表 3 海泡石碎块筛分试验结果

试样编号	冲击气压ρ/MPa	平均应变速率·ε/s^-1	各筛网上碎块(粉末)占比/%
试样编号	冲击气压ρ/MPa	平均应变速率·ε/s^-1	＞12.5 mm	8~12.5 mm	5~8 mm	2~5 mm	1~2 mm	≤1 mm
0.6-2	0.05	269	67.36	16.28	10.92	5.44	0	0
0.6-5	0.1	356	51.82	25.77	16.51	5.90	0	0
0.6-7	0.15	395	29.25	35.79	24.30	6.15	3.11	1.40
0.6-14	0.2	409	26.29	32.61	26.22	6.43	4.32	4.13
0.6-15	0.25	430	15.03	21.82	35.96	8.10	5.73	13.36

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