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Performance of the star‐shaped flyer in the study of brittle materials: Three dimensional computer simulations and experimental observations

Espinosa, H. D. and Raiser, G. and Clifton, R. J. and Ortiz, M. (1992) Performance of the star‐shaped flyer in the study of brittle materials: Three dimensional computer simulations and experimental observations. Journal of Applied Physics, 72 (8). pp. 3451-3457. ISSN 0021-8979. doi:10.1063/1.351419.

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A three dimensional finite element computer simulation has been performed to assess the effects of release waves in normal impact soft‐recovery experiments when a star‐shaped flyer plate is used. Their effects on the monitored velocity‐time profiles have been identified and their implications in the interpretation of wave spreading and spall signal events highlighted. The calculation shows that the star‐shaped flyer plate indeed minimizes the magnitude of edge effects. The major perturbation to the one‐dimensional response within the central region of the target plate results from spherical waves emanating from the corners of the star‐shaped plate. Experimental evidence of the development of a damage ring located in coincidence with the eight entrant corners of the flyer plate is reported. Microscopy studies performed in the intact recovered samples revealed that this damage ring eliminates undesired boundary release waves within the central region of the specimen. Consequently, the observed damage in compression and tension within this region can be attributed primarily to the conditions arising from a state of uniaxial strain.  

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Ortiz, M.0000-0001-5877-4824
Additional Information:© 1992 American Institute of Physics. (Received 27 March 1992; accepted for publication 30 June 1992) This research was supported by the National Science Foundation through its support of the MRG on Micromechanics of Failure-Resistant Materials. We acknowledge the support of Lanxide Armor Products, Inc. in providing the AlN/AlN/Al composite material samples
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Issue or Number:8
Record Number:CaltechAUTHORS:20171213-164520270
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83912
Deposited By: Lydia Suarez
Deposited On:14 Dec 2017 18:16
Last Modified:15 Nov 2021 20:15

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