Mean Stress Effect on the Shear Fatigue Crack Model—Part 2

[+] Author and Article Information
D. O. Swenson

Advanced Materials Research and Development Laboratory, Pratt & Whitney Aircraft, Middletown, Conn.

J. Appl. Mech 36(4), 731-735 (Dec 01, 1969) (5 pages) doi:10.1115/1.3564763 History: Received March 14, 1968; Revised February 26, 1969; Online September 14, 2011


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.

Copyright © 1969 by ASME
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