The Growth of Corner Cracks Under the Conjoint Action of High and Low Cycle Fatigue.
Final rept. Jun 85-Jun 87,
PORTSMOUTH POLYTECHNIC (ENGLAND) MECHANICAL BEHAVIOUR OF MATERIALS LAB
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Fatigue crack propagation rates have been measured fo 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. Keywords Fatigue crack growth, LowHigh cycle fatigue, Titanium, aluminum, Vanadium, Minor cycles, Major minor cycling.
- Properties of Metals and Alloys