The effect of strain rate on the character of $\sigma$-$\varepsilon$ diagrams

An equation governing the evolution of elastic strains (stresses) for a given strain rate is obtained using the field theory of defects under the assumption of uniform defect distribution. Strain diagrams are constructed by numerical solution of this equation and qualitative analysis of the phase portrait of the corresponding dynamic system. The effect of strain rate on the mechanical properties of materials is studied.