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[1]高强,汪海波,吕闹,等.不同冲击速度下硬煤的力学特性试验研究[J].中国安全生产科学技术,2019,15(1):69-74.[doi:10.11731/j.issn.1673-193x.2019.01.011]
　GAO Qiang,WANG Haibo,LYU Nao,et al.Experimental study on mechanical characteristics of hard coal under different impact velocities[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2019,15(1):69-74.[doi:10.11731/j.issn.1673-193x.2019.01.011]
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不同冲击速度下硬煤的力学特性试验研究
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
15
期数:
2019年1期
页码:
69-74
栏目:
职业安全卫生管理与技术
出版日期:
2019-01-31

文章信息/Info

Title:
Experimental study on mechanical characteristics of hard coal under different impact velocities
文章编号:
1673-193X(2019)-01-0069-06
作者:
高强; 汪海波; 吕闹; 宗琦
（安徽理工大学 土木建筑学院，安徽 淮南 232001）
Author(s):
GAO Qiang;  WANG Haibo;  LYU Nao;  ZONG Qi
(School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan Anhui 232001, China)
关键词:
被动围压; 薄壁套筒; 分离式霍普金森压杆(SHPB); 硬煤; 动态力学特性
Keywords:
passive confining pressure;  thinwalled sleeve;  split Hopkinson pressure bar (SHPB);  hard coal;  dynamic mechanical characteristics
分类号:
X936;TD315
DOI:
10.11731/j.issn.1673-193x.2019.01.011
文献标志码:
A
摘要:
为了研究硬煤破坏过程中的动态力学特性，采用Φ50 mm变截面分离式霍普金森压杆（SHPB）试验系统，对45#钢制薄壁套筒施加环向约束的硬煤试件进行不同加载速率的冲击压缩试验，得到被动围压下轴向应力-应变曲线、径向应力-应变曲线及最大被动围压和冲击速度的关系。研究结果表明：峰值应力、峰值应变随着冲击速度的增大而增大，最大被动围压值与冲击速度呈幂次增长的关系；被动围压下的硬煤试件变形受到限制，试件延性、抗压能力显著提高；随着冲击速度的增大，薄壁套筒对试件的约束也逐渐增大，达到峰值后，冲击速度对被动围压的影响减小，筒壁厚度影响着被动围压效果。
Abstract:
To study the dynamic mechanical characteristics of hard coal during the failure process, the impact compression tests under different loading rates on the hard coal specimens under the circumferential restraint applied by 45# steel thinwalled sleeve were carried out by using the Φ50 mm variable crosssection split Hopkinson pressure bar (SHPB) test system. The curves of axial stressstrain and radial stressstrain under the passive confining pressure as well as the relationship between the maximum passive confining pressure and the impact velocity were obtained. The results showed that the peak stress and peak strain increased with the increase of the impact velocity, and the maximum passive confining pressure presented a relationship of exponential increase with the impact velocity. The deformation of hard coal specimens under the passive confining pressure was restricted, and the ductility and compressive capacity of specimens increased significantly. With the increase of the impact velocity, the constraint of the thinwalled sleeve on the specimens increased gradually, and after reaching the peak value, the influence of the impact velocity on the passive confining pressure reduced, and the thickness of sleeve wall affected the effect of passive confining pressure.

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备注/Memo

备注/Memo:
收稿日期： 2018-12-07
基金项目： 安徽省高校自然科学研究重大项目（KJ2017ZD11）；国家自然科学基金项目（51404010，51374012）
作者简介： 高强，硕士研究生，主要研究方向为冲击动力学。
通信作者： 汪海波，博士，副教授，主要研究方向为爆破工程与冲击动力学。
更新日期/Last Update: 2019-01-31