STP791: Stress-Intensity Factors of Stiffened Panels with Partially Cracked Stiffeners

    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.

    Pages: 15    Published: Jan 1983


    Abstract

    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.

    Keywords:

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


    Paper ID: STP37070S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP37070S


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