Abstract
Kitagawa-Takahashi diagram that is modified for fatigue is now extended to the subcritical crack growth behavior under stress-corrosion crack growth. The analogy with the fatigue helps us to identify several regimes of interest from both the point of understanding of the material behavior as well as quantification of the failure process for structural design of components that are subjected to stress-corrosion and corrosion fatigue crack growths and failure. In particular, the diagram provides a means of defining the mechanical equivalent of chemical stress concentration factor and the chemical crack-tip driving forces to crack growth or its arrest. In addition, threshold stresses, crack arrest, and nonpropagating crack growth conditions can be defined, which help in developing sound design methodology against stress corrosion and corrosion fatigue. Chemical crack driving forces under corrosion fatigue can be similarly defined using the inert behavior as a reference.
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Acknowledgments
The author acknowledges the helpful discussions with Dr. A. K. Vasudevan of ONR. The research is supported by ONR under the contract N00014-10c-0359 with Dr. Vasudevan as Technical Monitor.
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Manuscript submitted April 26, 2012.
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Sadananda, K. Failure Diagram and Chemical Driving Forces for Subcritical Crack Growth. Metall Mater Trans A 44, 1190–1199 (2013). https://doi.org/10.1007/s11661-012-1469-x
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DOI: https://doi.org/10.1007/s11661-012-1469-x