Title

SANISAND (Dafalias and Manzari, 2004)

Description

SANISAND is an advanced elasto-plastic model based on a concept of rotational hardening. The model builds upon previous work of the writers, but three novel aspects are introduced. The first is a fabric-dilatancy related quantity, scalar valued in the triaxial and tensor valued in generalized stress space, which is instrumental in modeling macroscopically the effect of fabric changes during the dilatant phase of deformation on the subsequent contractant response upon load increment reversals, and the ensuing realistic simulation of the sand behavior under undrained cyclic loading. The second aspect is the dependence of the plastic strain rate direction on a modified Lode angle in the multiaxial generalization, a feature necessary to produce realistic stress-strain simulations in nontriaxial conditions. The third aspect is a very systematic connection between the simple triaxial and the general multiaxial formulation, in order to use correctly the model parameters of the former in the implementation of the latter. The simulative ability of the model is illustrated by comparison with data over a very wide range of pressures and densities.

Authors & References

Dafalias, Y. F. and Manzari, M. T. (2004). Simple plasticity sand model accounting for fabric change effects. Journal of Engineering Mechanics, Volume 130, No. 6, 622-634.

Simulation Software Offering This Model

Abaqus+

Abaqus

Plaxis+

Plaxis

Tochnog Professional+

Tochnog Professional

Calibration Software Offering This Model

Triax element test driver+

Triax element test driver

Incremental Driver+

Incremental Driver

Plaxis SoilTest+

Plaxis SoilTest

Tochnog Driver+

Tochnog Driver

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