Evolution of Stress-induced Fabric in a Strain Space Multiple Mechanism Model Accounting for Inherent Fabric Anisotropy

Consideration of inherent anisotropy is crucial to gaining am improved understanding of the behavior of granular materials. For describing the sand behavior associated with inherent anisotropy, a constitutive model has been developed within a framework of a strain space multiple mechanism model. In the proposed model, a second-order fabric tensor is extended by incorporating a new function that represents the effect of inherent anisotropy along with three additional parameters: two of them control the degree of anisotropy and the third one expresses the principal direction of inherent anisotropy. This manuscript investigates the effect of inherent anisotropy (i.e., the effect of the additional parameters) on the evolution of stress-induced fabric corresponding to the strain space fabric, which is given as a projection of the macroscopic strain field onto an individual virtual simple shear mechanism oriented in arbitrary directions