Abstract
Subcritical crack growth under sustained load in annealed Ti - 4Al - 3Mo - 1V (117 k.s.i. yield strength) was measured using compact tension specimens of three thicknesses, 0.75, 0.25 and 0.13 inch. Crack growth terminating in failure occurred under constant load in all three specimens at initial stress intensities well below the critical stress intensity as measured in rising load tests. Time to failure at low initial stress intensity was considerably increased by increased mixed mode stress conditions; it was appreciable longer in 0.13 than in 0.25 inch thick specimens. However, time to failure was about the same in 0.75 inch thick specimens, tested under linear elastic plane strain conditions, as in 0.25 inch thick specimens. Specimens size affected the kinetics of crack growth and the shape of the crack surface developed under sustained load. Up to the point of final unstable failure, fracture occurred almost exclusively in material under triaxial stress, resulting in a considerable amount of crack front bowing.
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