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Stress-corrosion cracking experiments have been performed on double-cantilever-beam specimens of 7079-T651 aluminum in 3 percent sodium chloride in distilled water and in seawater. At relatively low-stress intensities (Region I of the crack-growth rate/stress-intensity plot) crack length versus exposure time curves were comprised of steps, plateaus, and straight-line segments. These could not be related to any variations in the stress-intensity parameter; so, where such behavior was encountered, no unique relationship between stress intensity and crack-growth rate was apparent. On the other hand, crack-growth rate did vary inversely with exposure time for the range 25 to 200 h. Such an observation was interpreted to mean that properties of the local environment within a crack control extension rate.
stress corrosion, cracking (fracturing), crack propagation, aluminum, stress intensity, cantilever beams, salt water, seawater, solubility
research engineer, Dow Chemical Company, Freeport, Tex.
Associate professor of Ocean Engineering, Florida Atlantic University, Boca Raton, Fla.