Investigation of Finite Deformations and Shear Banding: Theory and Experiment

[+] Author and Article Information
A. E. Bayoumi, R. B. Joshi, H. M. Zbib

Department of Mechanical and Materials Engineering, Washington State University, Pullman WA 99164-2920

Appl. Mech. Rev 44(11S), S20-S26 (Nov 01, 1991) doi:10.1115/1.3121356 History: Online April 30, 2009


An experimental method using a digital image processing technique is developed for the purpose of characterizing material behavior at large elastoplastic deformations and the associated phenomenon of localization of plastic flow into shear bands. This allows for a detailed description of the evolution of the nonuniform deformation pattern in the post-localization regime. The experimental results are utilized to calibrate a recently developed gradient-dependent constitutive equation which takes into account the effect of heterogeneous plastic flow, anisotropy and large deformations. The measured values of the gradient coefficients are of small magnitude suggesting that higher order gradients are important only in the highly inhomogeneous region as expected. Moreover, it is found that anisotropic effects become significant in the post-localization regime where the anisotropy ratio changes considerably.

Copyright © 1991 by American Society of Mechanical Engineers
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