Improvement of a Cycle J Integral for CT Specimens

[+] Author and Article Information
Shao-Lun Liu, Ji-Zhou Xie

Institute of Aeronautical Materials, Beijing, People’s Republic of China

J. Eng. Gas Turbines Power 108(3), 521-524 (Jul 01, 1986) (4 pages) doi:10.1115/1.3239940 History: Received May 31, 1985; Online October 15, 2009


The cycle J integral formula for CT specimens has been improved as follows: ΔJ=(2/Bb)(α1 •U + α2 •ΔP•Δδ) + (2/Bb)Ue −1.2025a/w + 0.6233 for 0.3≤a/w≤0.53; ΔJ=(2/Bb)(α1 •U + α2 •ΔP•Δδ) + (2/Bb)Ue −0.02 sin[(π/0.23)(a/w−0.53)] for 0.53<a/w<0.95. This formula is applicable to the fatigue crack propagation range of 0.3≤a/w<0.95. In comparison with other formulae of the cycle J integral, the application range of the above expression is enlarged and its accuracy is also increased to a certain extent.

Copyright © 1986 by ASME
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