Micro-Macro Modeling of the Isothermal Steady-State Behaviour of Semi-Solids
A new micro-macro modeling is proposed to describe the isothermal steady state flow behaviour of semi-solid material in a large range of strain rates. The spatial distribution of the liquid and the solid and the deformation mechanisms are described through a specific choice of a representative pattern of the microstructure. The evolution of the microstructure with the shear rate is taken into account through an evolution equation of a structural parameter describing the fraction of the mechanically effective solid. The present model succeeds in determining the viscosity of Sn-15%wtPb and magnesium semi-solid alloys at low and high strain rates.
Véronique FAVIER, Carole ROUFF, Régis BIGOT, Marcel BERVEILLER, Marc ROBELET
semi-solid alloys, microstructure, constitutive equation, micromechanical modeling, self-consistent.