Strain Localization in Combined Axial-Torsional Testing on Kaolin Clay
Publication: Journal of Engineering Mechanics
Volume 132, Issue 5
Abstract
A series of combined axial-torsional tests were performed to study the 3D mechanical behavior of kaolin clay in an undrained condition. Using the digital image analysis technique, discrete local deformation of the surface of a hollow cylindrical specimen under loading was recorded. A linear interpolation method was used to generate a continuous deformation and strain field of the specimen based on the recorded discrete local deformations. Evolution of shear band was vividly visualized and recorded during the loading process for various inclinations of major principal stress. The theory of strain localization on continuous bifurcation was briefly reviewed and applied to the Mohr-Coulomb model, and a single hardening model incorporating the concept of loading-history-dependent plastic potential was developed by the writers. The largest critical plastic modulus and orientation of the shear bands were predicted by using the theoretical solution. Significant disagreement was observed between the experimental results and theoretical predictions related to the initial occurrence of strain localization and the inclination of fully developed shear bands.
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Acknowledgments
Financial support from the National Science Foundation (NSF) through grant numbers CMS 9872618 and 0296111 is gratefully acknowledged. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the writers and do not necessarily reflect the views of the NSF.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 132 • Issue 5 • May 2006
Pages: 555 - 564
Copyright
© 2006 ASCE.
History
Received: Mar 11, 2003
Accepted: May 12, 2005
Published online: May 1, 2006
Published in print: May 2006
Notes
Note. Associate Editor: Stein Sture
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