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The influence of pressure on the large deformation shear response of a Polyurea

Alkhader, Maen and Knauss, W. G. and Ravichandran, G. (2011) The influence of pressure on the large deformation shear response of a Polyurea. In: Time Dependent Constitutive Behavior and Fracture/Failure Processes. Conference Proceedings of the Society for Experimental Mechanics Series. Vol.3. Springer , New York, NY, pp. 287-295. ISBN 978-1-4419-9498-1.

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A new shear-compression experiment is developed to characterize the influence of hydrostatic pressure on the shear constitutive response of nearly incompressible viscoelastic materials undergoing large deformations. In this design, a uniform torsional shear stress is superposed on a uniform hydrostatic compressive state of stress generated by axially deforming samples confined by a stack of thin steel disks. The new design is effective in applying uniform multiaxial compressive strain while preventing buckling and barreling during inelastic deformation. In addition, it allows for the direct measurement of the stress and strain fields during the deformation history. The new shear-compression setup is developed to aid in characterizing the influence of pressure or negative dilatation on the shear constitutive response of viscoelastic materials in general and Polyurea in particular. Experimental results obtained with this technique illustrate the significant increase in the shear stiffness of polyurea under moderate to high hydrostatic pressures.

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Ravichandran, G.0000-0002-2912-0001
Additional Information:© 2010 Society for Experimental Mechanics Inc. First Online: 15 April 2011. 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 N000 14-09-1-0552.
Funding AgencyGrant Number
Office of Naval Research (ONR)N000 14-09-1-0552
Subject Keywords:Shear Stiffness; Prony Series; Shear Response; Free Volume Theory; Cylindrical Disk
Series Name:Conference Proceedings of the Society for Experimental Mechanics Series
Record Number:CaltechAUTHORS:20200601-143119734
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103623
Deposited By: Tony Diaz
Deposited On:01 Jun 2020 21:36
Last Modified:01 Jun 2020 21:36

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