Unified approach for modelling fatigue crack growth and some observations on behaviour under flight simulation loading

Raju, KN and Sunder, R (1984) Unified approach for modelling fatigue crack growth and some observations on behaviour under flight simulation loading. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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    Abstract

    Models of fatigue crack growth under constant and variable amplitude loading are briefly reviewed, Concepts of energy balance, damage and the phenomenon of crack closure are unified to Model fatigue crack growth. The relation derived from this Model is shown to account in a physically consistent manner for the effects of a number of parameters13; such as fracture toughness, stress ratio, threshold, thickness, non LEFM conditions, 'pop-in' under high stress ratio constant amplitude loading, etc., The concept of13; damage inherent in the Model allows quot;consideration of environwental effects on crack growth rates. Since the Model is hysteresis energy and crack closure based, the growth rate relation derived from it can account for interaction13; effects under variable amplitude loading. It also automatically inplies the applicability of Rainflow cycle counting to fatigue crack growth analysis under random loading, Interesting experimental work is presented to establish the applicability of Rainflow cycle counting to fatigue crack growth, Problems of extrapolating crack growth test data on simple laboratory specimens under flight simulation loading to prediction of crack growth in structures are examined , Segment Simulation Technique (SST) is proposed to resolve such problems.

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Fatigue crack growth;Stress intensity;Energy balance;Constant amplitude loading;Flight simulation loading;Cycle counting
    Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
    Division/Department: Structures Division, Structures Division
    Depositing User: Mr. Ravikumar R
    Date Deposited: 17 Nov 2006
    Last Modified: 24 May 2010 09:53
    URI: http://nal-ir.nal.res.in/id/eprint/3465

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