Abstract
Based on modern ideas about the destruction of materials, a statistical model of the mechanism of fatigue failure of materials is proposed. The mechanism of failure is associated with the accumulation in the material of scattered microdamages in the process of repeated loading. The criterion for the onset of fatigue failure is the achievement of critical values of the density of microdamages in cyclically loaded bodies that are identified with the density of microdamages formed by separation or shear during static destruction due to pure tension, compression and shear of standard material samples. Low-cycle fatigue is associated with the accumulation of predominantly microfracture shear in the area of plastic deformation, and high-cycle fatigue is associated with the microdestruction of separation during elastic deformation.
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