Plate impact experiments to investigate shock-induced inelasticity in Westerly granite

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	Plate impact experiments to investigate shock-induced inelasticity in Westerly granite
	Yuan FP(袁福平); Prakash V
刊名	INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
	2013-06-01
通讯作者邮箱	fpyuan@lnm.imech.ac.cn; vikas.prakash@case.edu
卷号	60 页码:277-287
关键词	Westerly granite Plate impact Shock response Spall strength Soft recovery experiments Micro-cracking Fragmentation
ISSN号	1365-1609
通讯作者	Prakash, V (reprint author), Case Western Reserve Univ, Dept Mech & Aerosp Engn, Case Sch Engn, Cleveland, OH 44106 USA.
产权排序	[Yuan, Fuping; Prakash, Vikas] Case Western Reserve Univ, Dept Mech & Aerosp Engn, Case Sch Engn, Cleveland, OH 44106 USA; [Yuan, Fuping] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
合作状况	国际
中文摘要	In the present study, plate-impact experiments are employed to better understand the stress threshold for inelasticity in Westerly granite. The experiments are designed to obtain the Hugoniot Elastic Limit (HEL) as well as spall strength following shock-induced compression in the Westerly granite samples. The HEL for Westerly granite is estimated to be in the range 3.2 to 3.5. GPa, while the spall strength is ~50. MPa for a pulse duration of 3. μs, and is nearly independent of the compression stress level in the stress range employed in the experiments (i.e. 0.7-5.0. GPa). In addition, soft-recovery plate-impact experiments are employed to better understand the threshold for initiation of micro-cracking in the granite samples. These recovery experiments are conducted at the same stress levels as the normal plate impact experiments (~0.7. GPa), and the duration of the tensile pulse is varied from 20 to 500. ns by varying the pre-set gap between the specimen and the momentum trap. The results indicate that the stress pulse duration threshold for initiation of spall is about 120. ns at an applied tensile stress level of ~0.7. GPa. In addition, tensile fracture in Westerly granite is observed to be time dependent with the spall strength dependent on the duration of the tensile pulse. For the soft recovery experiments that do not show a clear spall signal, the recovered granite specimens show relatively large micro-cracks (30-40. μm in width) near the plane where the unloading waves from the flyer and target free surfaces intersect. The spall plane reveals a relatively rough and a tortuous fracture surface. At higher magnifications, several cracks and pits/holes are detected on the spall plane. The fracture/damage mode is seen to be predominantly brittle, with damage initiating at the weak grain boundaries.
学科主题	冲击动力学
分类号	二类/Q2
收录类别	SCI ; EI
资助信息	National Science Foundation Earth Division [EAR: 0710975, EAR: 0810083]; National Science Foundation for the Major Research Instrumentation [NSF MRI CMMI 0079458, NSF MRI CMMI 0521364, FEI FE NanoSEM600]
原文出处	http://dx.doi.org/10.1016/j.ijrmms.2012.12.024
语种	英语
WOS记录号	WOS:000317802000029
公开日期	2013-05-31
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/47260]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Yuan FP,Prakash V. Plate impact experiments to investigate shock-induced inelasticity in Westerly granite[J]. INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,2013,60:277-287.
APA	Yuan FP,&Prakash V.(2013).Plate impact experiments to investigate shock-induced inelasticity in Westerly granite.INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,60,277-287.
MLA	Yuan FP,et al."Plate impact experiments to investigate shock-induced inelasticity in Westerly granite".INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES 60(2013):277-287.