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Title: Experimental and numerical investigations on feasibility and validity of prismatic rock specimen in SHPB
Authors: Li, X
Zhou, T 
Li, D
Wang, Z
Issue Date: 2016
Publisher: Hindawi Publishing Corporation
Source: Shock and vibration, 2016, v. 2016, 7198980 How to cite?
Journal: Shock and vibration 
Abstract: The paper presents experimental and numerical studies on the feasibility and validity of using prismatic rock specimens in split Hopkinson pressure bar (SHPB) test. Firstly, the experimental tests are conducted to evaluate the stress and strain uniformity in the prismatic specimens during impact loading. The stress analysis at the ends of the specimen shows that stress equilibrium can be achieved after about three wave reflections in the specimen, and the balance can be well maintained for a certain time after peak stress. The strain analysis reveals that the prismatic specimen deforms uniformly during the dynamic loading period. Secondly, numerical simulation is performed to further verify the stress and strain uniformity in the prismatic specimen in SHPB test. It indicates that the stress equilibrium can be achieved in prismatic specimen despite a certain degree of stress concentration at the corners. The comparative experiments demonstrate that the change of specimen shape has no significant effect on dynamic responses and failure patterns of the specimen. Finally, a dynamic crack propagation test is presented to show the application of the present work in studying fracturing mechanisms under dynamic loading.
ISSN: 1070-9622 (print)
DOI: 10.1155/2016/7198980
Rights: Copyright © 2016 Xibing Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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