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The objective of this investigation was to assess the feasibility of using J-integral fracture mechanics test techniques to quantify the stress corrosion characteristics of a titanium alloy in seawater. A series of elastic compliance J-integral tests were performed with 1TCT (modified compact tension) specimens of Ti-7Al-2Cb-1Ta in air and under conditions where the crack tip was exposed to seawater. A complementary series of single edge notched cantilever beam tests were performed in natural flowing seawater. Results showed that the stress corrosion susceptibility of this alloy was clearly identifiable in J-integral tests using the JI-R curve extrapolation method. The linear elastic crack initiation thresholds obtained with compact specimens under monotonically increasing load bracketed test results obtained with dead-weight-loaded cantilever beam specimens. For this alloy, the stress corrosion cracking microfracture process was identical in stagnant and fresh-flowing seawater.
elastic-plastic fracture, stress corrosion, titanium alloys, seawater environment, linear elastic fracture mechanics
Project Engineer, Fatigue and Fracture Branch, Code 2814, Metals and Welding Division, David Taylor Naval Ship Research and Development Center, Annapolis, Md.
Manager, Fatigue and Fracture Branch, David Taylor Naval Ship Research and Development Center, Annapolis, Md.