In this paper a rate dependent model for unsaturated geomaterials is presented. The formulation and numerical predictions are compared with available experimental results and discussed. The constitutive laws for the description of the time-dependent mechanical behaviour of saturated and unsaturated geomaterials generalize the isotach approach to the elastoplastic strain hardening based constitu...

One of the challenges encountered in industrialization new single-crystal superalloys parts (like high-pressure turbine blades and vanes for aircraft engines) is to limit mechanical stresses during solidification cooling metal. In order accurately predict viscoplastic flow as well thermo-mechanical behaviour Ni-based superalloy its cooling, this study a thermodynamically-consistent thermo-elast...

The spreading under surface tension and gravity of a droplet yield-stress fluid over thin film the same material is studied. converges to final equilibrium shape once driving stresses inside fall below yield stress. Scaling laws are presented for radius complemented with an asymptotic analysis shallow droplets. Moreover, numerical simulations using volume-of-fluid method regularized constitutiv...

Electromigration is a major road block in the pursuit of nanoelectronics and next generation power electronics. The current density in the state-of-the-art microelectronics solder joints is about 10 A/cm. In the next generation nanoelectronics solder joints this current density is expected to increase by an order of magnitude, at least. In this paper, a new damage mechanics formulation is imple...

The paper concerns with an iterative technique for solving discretized Stokes type equations with varying viscosity coefficient. We build a special block preconditioner for the discrete system of equations and perform an analysis revealing its properties. The subject of this paper is motivated by numerical solution of incompressible non-Newtonian fluid equations. In particular, the general anal...

MARCHAND and Duffy have reported detailed measurements of the temperature and strain as a shear band develops in a HY-100 steel. Assuming their torsional tests in thin-wall tubes can be adequately modeled by a viscoplastic block undergoing overall adiabatic simple shearing deformations. we investigate the effect of modeling the viscoplastic response of the material by a-power law. and flow rule...