Abstract
The second portion of the fatigue fracture kinetic diagram is described by a reliable equation with additional load ratios R in the case of the crack-tip closure effect and by the Forman equation for the values of load ratio R* in the case without the crack closure effect. We have obtained the analytical dependence of the effective range of the stress intensity factor ΔKeff on the nominal range ΔKR for the first part of the second portion of the fatigue fracture kinetic diagram (ΔK1-2,R≤ΔKR≤ΔKfcl,R) with various load ratios.
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