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The Growth of Corner Cracks Under the Conjoint Action of High and Low Cycle Failure

Report Number: AFWAL-TR-87-4130
Author: Powell, B. E.
Author: Henderson, I.
Author: Hall, R. F.
Corporate Author: Portsmouth Polytechnic
Laboratory: Materials Laboratory
Date of Publication: 1988-02
Pages: 80
Contract: F49620-85-C-0116DEF
AD Number: ADA190510

Fatigue crack propagation rates have been measured for Ti-6A1-4V and Ti-5331S aeroengine disc materials using compact tension and corner notched tensile test-pieces. The loadings used simulate both the start-stop operations of aeroengines which lead to low cycle fatigue and the in-flight vibrations which may cause high cycle fatigue. It is suggested that the different fatigue crack growth behavior of Ti-5331S, relative to that of Ti-6A1-4V, arises largely from the greater proportion of crack closure and short crack growth occurring in this alloy.

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