An expanded version of Swenson’s shear crack fatigue model is developed to include the effect of the mean stress on cyclic shear crack growth. Five results are concluded for this model. 1 As the mean shear stress is increased for a specified stress range, the cyclic shear crack tip displacement decreases. 2 The shear displacement at the center of the crack appears to be independent of the mean stress and remains constant for a given stress range. 3 An inherent blunting process for crack growth predicts retardation of tip displacement and crack growth for small values of stress range and all mean stress values. 4 The overall plactic zone length for this model does not change during cyclic shear loading although plastic deformation is occurring. 5 The model’s crack tip displacement per cycle is a linear function of the half crack length for prescribed stress range, mean stress, and material properties.

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