ABSTRACT: The aim of this paper is to model the rate-dependent behavior of soft soil by means of a microstructural approach. A new microstructural elasto-viscoplastic model was developed, based on the granular mechanics approach and the overstress theory of Perzyna. The deformation of a representative volume of the material is generated by mobilizing particle contacts. Thus, the stress-strain r...

This paper makes use of homogenization to generate a fairly general class rheological models for non-colloidal suspensions particles undergoing finite deformations and rotations under Stokes flow conditions. The can be nonlinear viscoelastic, or elasto-viscoplastic, while the suspending fluid Newtonian viscoplastic. microstructure is described by two microstructural ellipsoids, which are allowe...

In the present paper the effects of the thermal and mechanical actions on the residual stress field occurring in friction stir welding (FSW) of AA7075-T6 were investigated. Both numerical and experimental analyses were carried out to highlight the metallurgical phenomena and induced residual stresses in FS welded blanks. The welding process was simulated using a continuous rigid-viscoplastic fi...