SHEAR STRENGTH RELAXATION MODEL OF FIVE METALS (ALUMINUM, BERYLLIUM, COPPER, TANTALUM, URANIUM)
B. L. Glushak, I. N. Ignatova, S. S. Nadezhin, V. A. Raevskiy VANT. Ser.: Mat. Mod. Fiz. Proc 2012. Вып.2. С. 2536.
The defining relation is given for five metals  aluminum alloy AIa6, beryllium, copper I1, tantalum TVCh (highpurity tantalum), natural uranium. Phenomenological elastoplastic relaxation model is used for deviator component of shear stress. Stress tensor component spherical component is given in equation of state in MieGruneisen form. Melting temperaturedensity relationship is given in terms of Lindeman equation. The model considers strain and compression hardening, thermal softening, deformation rate sensitivity, change from sliding to twinning at highvelocity deformation, and describes elastic strain relaxation. Equation parametrical identification was carried out in terms of a large number of experiments.Keywords: model, hardening, viscosity, temperature, relaxation, shock wave, highvelocity deformation, parameters.
