Fatigue crack growth in Ti--6Al--4V from threshold to unstable fracture
Technical Report
·
OSTI ID:4326255
The fatigue crack growth of Ti-6Al-4V in the diffusion-bondannealed condition was examined in the range of growth rates from 10/sup -12/ to 10/sup -4/ m/cycle with the use of compact tension and partthrough-crack specimens. Effects of cyclic frequency and maximum stress were investigated. Fractured surfaces were examined by scanning electron microscopy over the entire range of crack growth. The fatigue data were fit empirically to a number of crack propagation laws, none of which was able to predict the entire range of crack growth from threshold to unstable fracture. When the fatigue crack growth rates were compared with those of Ti-6Al-4V of other microstructures, it was found that the diffusion-bond-annealed was among the most fatigue-crack-resistant of any microstructure examined. (auth)
- Research Organization:
- Aerospace Corp., El Segundo, Calif. (USA)
- NSA Number:
- NSA-29-027290
- OSTI ID:
- 4326255
- Report Number(s):
- AD--770980; SAMSO-TR--73-368
- Country of Publication:
- United States
- Language:
- English
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