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; Prakash, V (reprint author), Case Western Reserve Univ, Dept Mech & Aerosp Engn, Case Sch Engn, Cleveland, OH 44106 USA.
发表期刊	INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
	2013-06-01
卷号	60 页码:277-287
ISSN	1365-1609
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.
关键词	Westerly Granite Plate Impact Shock Response Spall Strength Soft Recovery Experiments Micro-cracking Fragmentation
学科领域	冲击动力学
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000317802000029
项目资助者	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]
课题组名称	LNM材料介观力学性能的表征
论文分区	二类/Q2
引用统计	被引频次：18[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/47260
专题	非线性力学国家重点实验室
通讯作者	Prakash, V (reprint author), Case Western Reserve Univ, Dept Mech & Aerosp Engn, Case Sch Engn, Cleveland, OH 44106 USA.
推荐引用方式 GB/T 7714	Yuan FP,Prakash V,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,&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.

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