Author(s)

K. Tanaka & Y. Akiniwa

Abstract

The propagation behavior of a circumferential crack in a cylindrical steel bar was studied under various combinations of cyclic torsional and axial loadings. The threshold condition of the onset of fatigue crack propagation from a pre-crack was expressed in terms of the stress intensity ranges for mode I and III. The J integral was applied to fatigue crack propagation with excessive plasticity under cyclic loading of mixed mode of I and III. 1 Introduction Fatigue cracks often show the mixed-mode I and III propagation in power train shafts subjected to reversed torsional and axial loading simultaneously. In comparison with the case of mode I , not many studies have been conducted on mode III or mixed mode of I and III. For damage torelance design, the direction as well

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