Stress-Intensity Factors of Stiffened Panels with Partially Cracked Stiffeners

    Published: Jan 1983

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    Theory and numerical procedure are presented to determine the stress-intensity factors for a partially cracked typical stiffener and a partially cracked splice stiffener in a stiffened panel subjected to a uniaxial uniform remote stress normal to the crack. The translational spring element and the beam element with special boundary conditions are investigated for the simulation of flexible fasteners. The finite-element procedure was applied to the problem. From the finite-element solution, the stress-intensity factors were determined by using the displacement method and the strain energy release rate method. Results are presented as stress-intensity configuration factors, Y, for various values of crack lengths, stiffening ratios, stiffener spacings, and fastener flexibilities. The crack growth lives computed from finite-element solutions are compared with test data of panels containing a partially cracked typical stiffener subjected to constant amplitude cyclic loading and spectrum loading. The correlation between the test data and the analyses is very good.


    stiffened panel, finite-element method, partially cracked stiffener, flexible fastener, stress-intensity factors, configuration factor, fracture mechanics

    Author Information:

    Shah, RC
    Principal engineer and senior specialist engineer, The Boeing Company, Seattle, Wash.

    Lin, FT
    Principal engineer and senior specialist engineer, The Boeing Company, Seattle, Wash.

    Paper ID: STP37070S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP37070S

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