Initialisation of internal variables

Evolving Elastic and Plastic Fabric Anisotropy in Granular Materials: Theoretical and Applied Implications

In this paper a relationship between elastic anisotropy, as typically
observed in clayey soils subjected to shear wave propagation tests, and plastic
anisotropy, detected at yielding and leading to rotated yield loci, is proposed.
Furthermore, elastic and plastic anisotropies exhibit an evolving character, as a
consequence of the evolution of the fabric of the material induced, for example,
by irreversible straining. First, the theoretical implications of the above evolving
character of fabric, which leads to a new form of anisotropic elasto-plastic

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