Journal
PHYSICAL MESOMECHANICS
Volume 18, Issue 2, Pages 163-173Publisher
SPRINGER
DOI: 10.1134/S1029959915020095
Keywords
fatigue; fatigue life; scales; mesomechanics; synergetics; bifurcations; effective factors; stress concentration; crack growth; rotation
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A new paradigm is proposed for considering metal fatigue cracking based on the principles of synergetics and physical mesomechanics. Fatigue cracking is described as a three-stage process. Metal evolution is studied with stress growth from the micro- (ultrahigh cycle fatigue) to meso- (high cycle fatigue) and then macroscale (low cycle fatigue). The notion of two effective stress concentration factors on the metal surface and in its bulk is introduced; their variation pattern with stress growth is discussed. In the general case, the propagation of through-the-thickness cracks is shown to also occur in three stages-on the micro- (shear), meso- (rotation with the formation of triangular fatigue striations) and macroscale (rotation plus shear which lead to the formation of fatigue striations of complex shape), consecutively.
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