Verification of the characteristic state plasticity by 3D-GEM tri-axial tests

Abstract

Verification of the characteristic state plasticity by 3D-GEM tri-axial tests Chunyue ZOU, Yuji KISHINO Recently, Krenk proposed a constitutive theory for granular materials called "the characteristic state plasticity". This model is rather simple as the Cam-clay model, even though the dependency of the third stress invariant on the yield function and the non-associative flow rule are took into account. The purpose of this paper is to verify the applicability of the theory by comparing the theory with 3D GEM simulation tests.After showing how to calibrate material constants used in the theory, the paper discusses the predictability of elasto-plastic stress-strain relationship for various loading directions. It is concluded that the material constants determined for the tri-axial loading process can be used for the prediction of unloading-reloading process. However, the theory may have to be modified to predict responses along general loading paths.