SANISAND (Dafalias and Manzari, 2004)


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.


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.

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  1. Sudipta Bhowmick
    Sudipta Bhowmick 4 years ago

    Hi All,
    I want to use the SANI SAND Model for my Abaqus model. What is the procedure for that?

  2. Sudipta Bhowmick
    Sudipta Bhowmick 3 years ago

    What is the definition of SANI-SAND model parameter ‘m’? How can we determine this parameter for soil?

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