.. include:: sub.txt ================== ManzariDafalias ================== .. function:: nDMaterial('ManzariDafalias', matTag, G0, nu, e_init, Mc, c, lambda_c, e0, ksi, P_atm, m, h0, ch, nb, A0, nd, z_max, cz, Den) :noindex: This command is used to construct a multi-dimensional Manzari-Dafalias(2004) material. ================================ =========================================================================== ``matTag`` |int| integer tag identifying material ``G0`` |float| shear modulus constant ``nu`` |float| poisson ratio ``e_init`` |float| initial void ratio ``Mc`` |float| critical state stress ratio ``c`` |float| ratio of critical state stress ratio in extension and compression ``lambda_c`` |float| critical state line constant ``e0`` |float| critical void ratio at p = 0 ``ksi`` |float| critical state line constant ``P_atm`` |float| atmospheric pressure ``m`` |float| yield surface constant (radius of yield surface in stress ratio space) ``h0`` |float| constant parameter ``ch`` |float| constant parameter ``nb`` |float| bounding surface parameter, :math:`nb \ge 0` ``A0`` |float| dilatancy parameter ``nd`` |float| dilatancy surface parameter :math:`nd \ge 0` ``z_max`` |float| fabric-dilatancy tensor parameter ``cz`` |float| fabric-dilatancy tensor parameter ``Den`` |float| mass density of the material ================================ =========================================================================== The material formulations for the ManzariDafalias object are: * ``'ThreeDimensional'`` * ``'PlaneStrain'`` See also `here `_ References Dafalias YF, Manzari MT. "Simple plasticity sand model accounting for fabric change effects". Journal of Engineering Mechanics 2004