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Accelerated Threshold Fatigue Crack Growth Effect-Powder Metallurgy Aluminum AlloyFatigue crack growth (FCG) research conducted in the near threshold regime has identified a room temperature creep crack growth damage mechanism for a fine grain powder metallurgy (PM) aluminum alloy (8009). At very low (Delta) K, an abrupt acceleration in room temperature FCG rate occurs at high stress ratio (R = K(sub min)/K(sub max)). The near threshold accelerated FCG rates are exacerbated by increased levels of K(sub max) (K(sub max) = 0.4 K(sub IC)). Detailed fractographic analysis correlates accelerated FCG with the formation of crack-tip process zone micro-void damage. Experimental results show that the near threshold and K(sub max) influenced accelerated crack growth is time and temperature dependent.
Document ID
20030014978
Acquisition Source
Langley Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Piascik, R. S. (NASA Langley Research Center Hampton, VA United States)
Newman, J. A. (Army Research Lab. Hampton, VA United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2002
Subject Category
Structural Mechanics
Meeting Information
Meeting: Fatigue 2002: 8th International Fatigue Congress
Location: Stockholm
Country: Sweden
Start Date: June 2, 2002
End Date: June 7, 2002
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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