Study of naturally initiating notch root fatigue cracks under spectrum loading

Prakash, Raghu V and Sunder, R and Mitchenko, EI (1996) Study of naturally initiating notch root fatigue cracks under spectrum loading. In: Proceedings of the 3rd Symposium on Advances in Fatigue Lifetime Predictive Techniques, 16-17 May 1994, Montreal, Canada.

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Abstract

The kinetics of short cracks at notches were studied in 2014-T6511 Al-Cu alloy extruded bar stock under modified versions of FALSTAFF and TWIST load spectra. Experiments were conducted on test coupons of different thickness and at different stress levels. The effects of these and other parameters on the density and growth rate patterns of multiple cracks were investigated. The quality of fractographic crack growth rate measurements was found to be superior to surface replica technique. It was also observed that artificially initiated fatigue cracks grow slower than naturally initiated ones. Interaction of naturally initiating multiple cracks was quantified.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Notch strength;Crack initiation;Short cracks;Fatigue life;Cycle loads;Aluminum alloys;Copper alloys;Stress cycles;Parameter identification;Fractography;Crack propagation
Subjects: ENGINEERING > Structural Mechanics
Division/Department: Structural Integrity Division, Structural Integrity Division, Other
Depositing User: M/S ICAST NAL
Date Deposited: 14 Jan 2008
Last Modified: 24 May 2010 09:55
URI: http://nal-ir.nal.res.in/id/eprint/4316

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