A Study of Naturally Initiating Notch Root Fatigue Cracks Under Spectrum Loading

Prakash, Raghu V and Mitchenko, EI (1994) A Study of Naturally Initiating Notch Root Fatigue Cracks Under Spectrum Loading. Technical Report. National Aerospace Laboratories, Bangalore, India.

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    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 was investigated. The quality of fractographic crack growth rate measurements was found to be superior to surface replica technique. It was also observed that artificially13; initiated fatigue cracks grow slower than naturally initiated ones. Interaction of naturally13; initiating multiple cracks was quantified.

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Short cracks;Notch root fatigue;Spectrum loading;Multiple cracks thickness effect;Replica fractoraphy
    Subjects: ENGINEERING > Structural Mechanics
    Division/Department: Structural Integrity Division, Other
    Depositing User: Smt Bhagya Rekha KA
    Date Deposited: 05 Jun 2006
    Last Modified: 24 May 2010 09:43
    URI: http://nal-ir.nal.res.in/id/eprint/1704

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