SYMPOSIA PAPER Published: 01 January 1976
STP28677S

Activation Energy Dependence on Stress Intensity in Stress-Corrosion Cracking and Corrosion Fatigue

Source

The phenomena of stress-corrosion cracking and corrosion fatigue have been investigated assuming that a thermally activated process (diffusion) acts in conjunction with mechanical energy to produce subcritical extension of a flaw. Associated with this diffusion process is an apparent activation energy which is shown to be dependent on the stress-intensity level indicating that the rate limiting diffusion step is associated with the material rather than the environment. A characteristic activation energy associated with the diffusion process is obtained by plotting apparent activation energy versus mechanical energy input required for crack extension and extrapolating to zero mechanical energy input. The characteristic activation energy associated with the stress-corrosion differs fram that associated with the corrosion-fatigue process. Thus, a linear superposition model for corrosion fatigue employing stress-corrosion data is not valid for the material studied. Also from this plot it can be seen that the toughness of the material at the crack tip is inherently degraded by the diffusion process.

Author Information

Bania, PJ
Wright-Patterson Air Force Base, Ohio
Antolovich, SD
University of Cincinnati, Cincinnati, Ohio
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Details
Developed by Committee: G01
Pages: 157–175
DOI: 10.1520/STP28677S
ISBN-EB: 978-0-8031-4684-6
ISBN-13: 978-0-8031-0580-5