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A Kinetic Analysis of High Temperature Fatigue Crack Growth

Report Number: AFWAL TR 81-4036
Author: Liu, H. W.
Author: McGowan, J. J.
Corporate Author: Materials Laboratory
Date of Publication: 1981-06-01
Pages: 11
AD Number: ADA104209

The increased fatigue crack growth rate at high temperature is primarily caused by environmental effects. The amount of the environmental effect depends on the penetration rate of the detrimental chemical specie relative to the crack growth rate. Depending upon the relative chemical penetration rate, there can either be no, partial, or full environmental effects. In both cases of no or full environmental effects, da/dN is not sensitive to cyclic frequency and temperature. In the case of partial environmental effect, da/dN is controlled by the rate of the transport of the detrimental chemical specie to crack tip, and da/dN is both frequency and temperature dependent. The da/dN data of IN 100, Waspaloy, and 304 stainless steel were analyzed. The data seem to support the analysis.

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