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

Raju, KN and Sunder, R Unified approach for modeling fatigue crack growth and some observations on behaviour under flight simulation loading. In: 6th International Conference on Fracture (ICF6)., 4-10 Dec 1984, New Delhi.

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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 crack growth rate relation derived from this model is shown to account in a physically consistent manner for the effects of a number of parameters such as fracture toughness, stress ratio, threshold, thickness, non LEFM conditions, 'pop-in' under high stress ratio constant anplitude loading, etc., The concept of damage inherent in the model allows consideration of environmental 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 interaction effects under variable amplitude loadinq. It also automatically implies 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 loadinq to predictlon of crack growth in structures are examined, Segment Simulation Technique (SST) is proposed to resolve such problems.

    Item Type: Conference or Workshop Item (Paper)
    Uncontrolled Keywords: Fatigue crack growth;Stress intensity;Energy balance
    Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
    Division/Department: Materials Science Division, Materials Science Division
    Depositing User: Smt Bhagya Rekha KA
    Date Deposited: 06 Nov 2013 10:16
    Last Modified: 06 Nov 2013 10:16
    URI: http://nal-ir.nal.res.in/id/eprint/11839

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