Abstract
A kinetic criterion of fatigue fracture of metallic materials is suggested and used for showing the existence of a single fatigue curve for cases of soft (with specified load amplitude) and rigid (with specified strain range in a cycle) loading for the stages of crack formation and propagation. The criterion makes it possible to compute the endurance of elements of a structure and levels of accumulated damage in terms of the ultimate accumulated damage for any loading stage including programmed loading (combination of soft and rigid loading, double-frequency and random loading, and loading with temporary holds under load). The criterion is substantiated by numerous experimental data for various metallic structural materials.
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