Abstract
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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Original Russian Text © A.A. Shanyavsky, 2014, published in Fizicheskaya Mezomekhanika, 2014, Vol. 17, No. 6, pp. 87–98.
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Shanyavsky, A.A. Scales of metal fatigue cracking. Phys Mesomech 18, 163–173 (2015). https://doi.org/10.1134/S1029959915020095
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DOI: https://doi.org/10.1134/S1029959915020095