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. 25-36.
The defining relation is given for five metals - aluminum alloy AIa6, beryllium, copper I1, tantalum TVCh (high-purity tantalum), natural uranium. Phenomenological elasto-plastic relaxation model is used for deviator component of shear stress. Stress tensor component spherical component is given in equation of state in Mie-Gruneisen form. Melting temperature-density 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 high-velocity 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, high-velocity deformation, parameters.
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