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A flow theory describing the yielding of anisotropic frictional materials is discussed. The formulation incorporates directional distribution of voids as a measure of the material microstructure. The conditions at failure are defined by invoking a set of scalar-valued functions representing spatial variation of the basic material parameters. The flow rule is generalized to incorporate the effect of the initial fabric of the material. The formulation is illustrated by some numerical examples demonstrating the directional dependence of the load-deformation characteristics.
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S. Pietruszczak (1999) studied this question.
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