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Effect of low temperature on fatigue and fracture properties of Ti-5Al-2.5Sn(ELI) for use in engine componentsExperiments were conducted to evaluate the characteristics of the Ti-5Al-2.5Sn (ELI) alloy used in a fuel pump impeller at cryogenic temperatures. Tension, fracture toughness, and fatigue crack propagation data were collected determining the effect of frequency and load ratio on crack propagation. The results revealed that tensile strength increased significantly at 20 K compared to room temperature and fracture toughness was reduced at cryogenic temperatures. The fatigue crack growth rate was not sensitive to experimental conditions and there were only minimal crack orientation effects. Different frequencies produced no effect. At various temperatures and frequencies a load ratio increase resulted in higher crack growth rates. At low stress intensity levels the fatigue rate for both temperatures was the same; however, at high stress intensity levels the crack growth rate at 20 K increased because of the decrease in fracture toughness. The results correlated well with previous data.
Document ID
19850065821
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ryder, J. T.
(Lockheed-California Co. Burbank, United States)
Witzell, W. E.
(General Dynamics Corp. Convair Div., San Diego, CA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Subject Category
Metallic Materials
Meeting Information
Meeting: Fatigue at low temperatures
Location: Louisville, KY
Start Date: May 10, 1983
Accession Number
85A47972
Funding Number(s)
CONTRACT_GRANT: NAS3-18896
Distribution Limits
Public
Copyright
Other

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