Abstract
1. Based on an analysis of the experimental data obtained and the results of fractographic studies of fracture surfaces, we have proposed a model of fatigue crack growth under cyclic loading and the transition to unstable crack growth, based on a consideration of the crack growth rate in a zone damaged during cyclic loading and explaining the above-noted test results. 2. It has been shown that, together with strain-rate sensitivity, characteristics of the cyclic strain of metals may be used as bases for classifying materials according to the degree to which the cyclicity of load application effects a reduction in fracture toughness. The reduction is greatest for materials sensitive to strain rate and steels which do not strain-harden under cyclic loads. There is no such effect for materials not strain-rate sensitive and for steels which strain-harden under cyclic loads, as well as for steels with very small cyclic strains.
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