Engineering analysis of notch root fatigue crack growth under spectrum loading

Sunder, R (1989) Engineering analysis of notch root fatigue crack growth under spectrum loading. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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    Abstract

    An engineering procedure is described to predict notch root fatigue crack growth under spectrum loading . Long crack growth rate and closure data, notch root stress-strain analysis and Rainflow cycle counting constitute major inputs to the prediction process . The procedure models non uniform extension of the part-through crack front, crack growth in compression fatigue and the effect of tensile and compressive overloads. Crack growth predictions under constant amplitude and combat aircraft spectrum loading were compared with data from the literature for 2 .3 mm and 6 .25 mm thick 2024-T3 alloy sheet material . Good predictions were obtained for the thicker material using Linear Elastic Fracture Mechanics approach . The thinner material required inclusion of strainbased intensity and residual stress effects for more realistic predictions . Neglecting these factors as a rule provided unconservative life estimates .

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Notch root crack growth;Central hole;Short crack;Crack life prediction;Crack closure;Cycle counting;Spectrum loading
    Subjects: ENGINEERING > Structural Mechanics
    Division/Department: Structures Division
    Depositing User: Deputy Head Poornima Narayana
    Date Deposited: 10 Aug 2006
    Last Modified: 24 May 2010 09:45
    URI: http://nal-ir.nal.res.in/id/eprint/1973

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