STP945

    Fatigue Crack Growth at Root Radii in Sheets with Variable Thickness

    Published: Jan 1988


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    Abstract

    Fatigue crack growth data have been obtained for cracks at root radii in sheets with variable thickness. These test data were obtained under constant-amplitude as well as spectrum loading. Analytical stress-intensity factors were developed using mathematical techniques. The Mode I stress-intensity factors were approximately 10% lower than that of a plate with uniform thickness. Crack growth predictions for the test specimens were made using the analytical stress-intensity factors and a crack growth equation for a skin with uniform thickness. A good correlation is shown between observed and predicted crack growth behavior.

    Keywords:

    crack growth, stress intensity factors, spectrum loading, land, root radii, integral equation


    Author Information:

    Ratwani, MM
    Manager, Structures Research, senior technical specialist, Specimen Preparation and Mechanical Test, M and P Research and Technology, Northrop Corporation, Aircraft Division, Hawthorne, CA

    Kan, H-P
    Manager, Structures Research, senior technical specialist, Specimen Preparation and Mechanical Test, M and P Research and Technology, Northrop Corporation, Aircraft Division, Hawthorne, CA

    Hsu, SM
    Manager, Structures Research, senior technical specialist, Specimen Preparation and Mechanical Test, M and P Research and Technology, Northrop Corporation, Aircraft Division, Hawthorne, CA


    Paper ID: STP23275S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP23275S


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