Thermodynamically Consistent Decoupled Strength Model for Two-Phase Materials with Phase Transistions
DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) WEAPONS SYSTEMS DIV
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A constitutive two-phase material model is formulated, which satisfies the decoupling of deviatoric stress and pressure response required by many hydrocodes. Two-phase materials are assumed to be non-dispersive. Basis of the present model is a decoupled model based on a general Maxwell-type viscoelastic model. The proposed formulation provides thermodynamic consistency for the case of small elastic shear strains and unrestricted volumetric response. The model is verified against experimental data on the shock wave propagation in iron resulting in alpha-epsilon phase transition, while the strength effects being observed at the same time.
- Physical Chemistry