Effect of Stress Ratio on Short Fatigue Crack Growth

[+] Author and Article Information
C. H. Wang

School of Engineering and Technology, Deakin University, Geelong, Vic 3217 Australia

J. Eng. Mater. Technol 118(3), 362-366 (Jul 01, 1996) (5 pages) doi:10.1115/1.2806819 History: Received November 28, 1994; Revised August 19, 1995; Online November 27, 2007


A model of short fatigue crack growth is proposed, which is based on the blocked slip concept and the shear decohesion mechanism. The analysis is extended to the case of mean stress loading. A theoretical proof is presented for the transfer of slip bands across grain boundaries. The rate of growth is proportional to the shear strain range and the maximum plastic zone size. There are no adjustable parameters in the theory for the case of high strain level, when the plastic strain dominates the decohesion process. Otherwise only one constant is needed, which may be derived from long crack growth data. The model is shown to provide satisfactory predictions of experimental results under uniaxial loading with various stress amplitudes and mean stresses.

Copyright © 1996 by The American Society of Mechanical Engineers
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