Author: DR. Anderson

Publisher:

Published: 1984

Total Pages: 16

ISBN-13:

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.