An Interpolative Model for Elevated Temperature Fatigue Crack Propagation
Final rept. 3 Feb 1975-31 Jul 1976 on Phase 1
PRATT AND WHITNEY WEST PALM BEACH FL GOVERNMENT PRODUCTS DIV
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A flexible alternative to the familiar Paris equation has been developed for the interpolative analysis of elevated temperature fatigue crack propagation data. The model is based on the hyperbolic sine equation, logda dn C1 sinh C2log delta K C3 C4, and the coefficients are shown to be simple functions of test frequency, stress ratio, and temperature. This methodology has been successfully used to describe crack propagation characteristics of selected nickel-base, titanium, and steel alloys.
- Theoretical Mathematics