A Study of Fatigue Crack Growth in Lugs Under Spectrum Loading

Sunder, R and Prakash, Raghu V (1994) A Study of Fatigue Crack Growth in Lugs Under Spectrum Loading. Technical Report. National Aerospace Laboratories, Bangalore, India.

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    Abstract

    Optical fractography and special load sequencing were used to characterize the growth of naturally initiating fatigue cracks under FALSTAFF spectrum loading in lugs with13; bushes fitted to varying degrees of interference. The same technique was used to obtain a stress intensity calibration under constant am plitude.loading. This calibration, corn- bined with crack growth analysis using the hysteretic closure concept and Rainflow cycle count corelated well with experimental observations of growth rate down to crack depth of 100 microns. Available analytical stress intensity solutions do not appear to explain observed high crack growth rates, particularly as crack size diminishes to part through dimensions.

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Lugs;Fatigue;Crackgrowth;Crack closer;Spectrum loading;Part-through crackers;Bush-lug interference stress intensity factor;Fractography.
    Subjects: AERONAUTICS > Aircraft Stability and Control
    Division/Department: Structural Integrity Division, Structural Integrity Division
    Depositing User: Mrs Manoranjitha M D
    Date Deposited: 16 May 2006
    Last Modified: 24 May 2010 09:41
    URI: http://nal-ir.nal.res.in/id/eprint/1355

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