Abstract

We propose an analytic description of the fatigue crack growth rate in metals based on experimental data taking into account the regularities of changes in the kinetic diagrams of fatigue fracture depending on different load ratios R , R * and the phenomenon of closure of the crack tip. We establish an empirical relationship between the effective ΔK eff and nominal ΔK Rranges of the stress intensity factors for the load ratio R (for the load ratio R *, the phenomenon of fatigue crack-tip closure is absent) valid within the limits of existence of fatigue crack-tip closure: from the critical threshold effective stress intensity factor range ΔK {fcl , th , R} to the critical effective stress intensity factor range ΔK {fcl , R}.

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