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Experimental Investigation of Failure in Viscoelastic Elastomers Under Combined Shear and Pressure

Alkhader, Maen and Knauss, Wolfgang and Ravichandran, Guruswami (2013) Experimental Investigation of Failure in Viscoelastic Elastomers Under Combined Shear and Pressure. In: Challenges in Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials. Conference Proceedings of the Society for Experimental Mechanics Series. Vol.2. Springer , New York, NY, pp. 55-62. ISBN 978-1-4614-4240-0.

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An experimental approach, based on Split Hopkinson Pressure Bar (SHPB) apparatus, is developed to elucidate failure of viscoelastic elastomers under combined shear and high pressures such as are encountered in explosive and/or armor-impact scenarios. In this experimental arrangement, thin cylindrical polyurea specimens with an aspect ratio (Diameter to thickness) greater or equal to 15 are tested, up to failure, using Split Hopkinson Pressure Bar (SHPB). Specimens with large aspect ratio are used to guarantee the close approximation of a triaxial state of stress in the specimen upon loading; hence the measured normal stress would be approximately equal to the hydrostatic pressure in the specimen. Friction at the loading interfaces forces the stress state to deviate from uniformity, restrict both the circumferential and radial displacements and lead to the development of shear stresses and strains. Hence, induced failure occurs under conditions combining high-strain-rate, high pressure and shear stresses. By using this setup, repeatable failure modes were detected and elucidated using finite element simulations.

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Ravichandran, Guruswami0000-0002-2912-0001
Additional Information:© 2013 The Society for Experimental Mechanics. First Online: 25 October 2013. The authors wish to thank Dr. Roshdy Barsoum of the Office of Naval Research through his guidance and cooperation and for the sustained support of this difficult effort under Grant ONR N00014-07-1-0624.
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-07-1-0624
Subject Keywords:Failure; Viscoelastic elastomers; Combined loading; High-strain-rate
Series Name:Conference Proceedings of the Society for Experimental Mechanics Series
Record Number:CaltechAUTHORS:20200520-074532493
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103342
Deposited By: Tony Diaz
Deposited On:20 May 2020 15:49
Last Modified:16 Nov 2021 18:20

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