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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.
Source PublicationINTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
2013-06-01
Volume60Pages:277-287
ISSN1365-1609
AbstractIn 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.
KeywordWesterly Granite Plate Impact Shock Response Spall Strength Soft Recovery Experiments Micro-cracking Fragmentation
Subject Area冲击动力学
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000317802000029
Funding OrganizationNational 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]
DepartmentLNM材料介观力学性能的表征
Classification二类/Q2
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/47260
Collection非线性力学国家重点实验室
Corresponding AuthorPrakash, V (reprint author), Case Western Reserve Univ, Dept Mech & Aerosp Engn, Case Sch Engn, Cleveland, OH 44106 USA.
Recommended Citation
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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