Measurement of ejection velocity of rock fragments under dynamic compression and insight into energy partitioning

doi:10.1016/j.ijrmms.2021.104992

	Measurement of ejection velocity of rock fragments under dynamic compression and insight into energy partitioning
	Xing, Haozhe 4; Wang, Mingyang 4; Ju, Minghe 3; Li, Jianchun 2; Li, Xiaofeng 1
刊名	INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
	2022
卷号	149 页码:11
关键词	Dynamic compression Rock fragmentation Ejection velocity 3D digital image correlation Energy partitioning
ISSN号	1365-1609
DOI	10.1016/j.ijrmms.2021.104992
英文摘要	High-speed three-dimensional digital image correlation (3D-DIC) technique was utilised to examine the ejection velocity characteristics of rock fragment in dynamic compression tests. The fragment velocity components of fragment were extracted from velocity fields distributed within the fragment area. By identifying the peak resultant velocity, the initial fragment ejection velocity was determined. The kinetic energy of fragments was evaluated with the initial ejection velocity and the mass of the fragments in each size group. Results show that the fragment movement is successively accelerated by stress-wave propagation, crack opening and Poisson's effect which contribute to the axial, circumferential and radial velocity component of fragment, respectively. The variance in circumferential velocity of two neighbouring fragment areas indicates the formation of fragments. The peak value of radial velocity, which is the chief component in ejection velocity reveals the time when ejection taking place. The initial ejection velocity of fragment gradually decreases with increasing size, but increases significantly as strain rate increases. The kinetic energy of fragments ejection comprises 12%-24% of absorbed energy at strain rate of 69-100 s-1, and the percentage further increases with increasing strain rates. Ignoring the kinetic energy of fragments will lead to overestimation of dissipated energy consumed by rock fragmentation in dynamic compression.
资助项目	National Natural Science Foundation of China[52009138] ; Natural Science Foundation of Jiangsu Province[BK20200583] ; Research and Innovation Fund Project of AEU
WOS研究方向	Engineering ; Mining & Mineral Processing
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000729373900002
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/30968]
专题	中科院武汉岩土力学所
通讯作者	Xing, Haozhe; Ju, Minghe
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.Southeast Univ, Sch Civil Engn, Nanjing 210096, Peoples R China 3.China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 211116, Jiangsu, Peoples R China 4.Army Engn Univ PLA, State Key Lab Disaster Prevent & Mitigat Explos &, Nanjing 210007, Peoples R China
推荐引用方式 GB/T 7714	Xing, Haozhe,Wang, Mingyang,Ju, Minghe,et al. Measurement of ejection velocity of rock fragments under dynamic compression and insight into energy partitioning[J]. INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,2022,149:11.
APA	Xing, Haozhe,Wang, Mingyang,Ju, Minghe,Li, Jianchun,&Li, Xiaofeng.(2022).Measurement of ejection velocity of rock fragments under dynamic compression and insight into energy partitioning.INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,149,11.
MLA	Xing, Haozhe,et al."Measurement of ejection velocity of rock fragments under dynamic compression and insight into energy partitioning".INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES 149(2022):11.