The of effects of dynamic strain aging on the tensile and smooth rotating strength of 18-8 type austenitic stainless steel at room and elevated temperatures were investigated.

In this paper a double hardening model with two hardening parameters (i. e. plastic volumetric strain and shear strain) and a single smooth yield function has been proposed.

The stress-strain relations of the materials used in the three layers are assumed as a power function and the contacts between layers are smooth.