Lode Dependences for Isotropic Pressure-Sensitive Elastoplastic Materials

[+] Author and Article Information
J. P. Bardet

Department of Civil Engineering, University of Southern California, Los Angeles, CA 90089-0242

J. Appl. Mech 57(3), 498-506 (Sep 01, 1990) (9 pages) doi:10.1115/1.2897051 History: Received March 14, 1988; Revised October 25, 1988; Online March 31, 2008


Experimental investigations indicate that the third stress invariant; Lode angle α affects significantly the behavior of pressure sensitive materials. The present communication presents a formulation to account for α in isotropic pressure-sensitive elastoplastic materials. Seven Lode dependences are reviewed. A new one, referred to as LMN, in proposed to generalize Lade and Duncan, and Matsuoka and Nakai failure surfaces. The formulation is general enough to introduce α into the isotropic elastoplastic modes which are only developed in terms of first and second-stress invariants. As an illustration, several Lode dependences are introduced into Roscoe and Burland model. The performance of the modified model is estimated by comparing experimental and analytical results in the case of true triaxial loadings on normally consolidated clay.

Copyright © 1990 by The American Society of Mechanical Engineers
Topics: Pressure , Stress , Failure
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