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    STP1020

    Stress-Intensity Factors for Small Surface and Corner Cracks in Plates

    Published: 01 January 1989


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    Abstract

    Three-dimensional finite-element and finite-element-alternating methods were used to obtain the stress-intensity factors for small surface and corner cracked plates subjected to remote tension and bending loads. The crack-depth-to-crack-length ratios (a/c) ranged from 0.2 to 1, the crack-depth-to-plate-thickness ratios (a/t) from 0.05 to 0.2. The performance of the finite-element alternating method was studied on these crack configurations. A study of the computational effort involved in the finite-element-alternating method showed that several crack configurations can be analyzed with a single rectangular mesh idealization, whereas the conventional finite-element method requires a different mesh for each configuration. The stress-intensity factors obtained with the finite-element-alternating method agreed well (within 5%) with those calculated from the finite-element method with singularity elements.

    The stress-intensity factors calculated from the empirical equations proposed by Newman and Raju were generally within 5% of those calculated by the finite-element method. The stress-intensity factors given herein should be useful in predicting crack-growth rates and fracture strengths of surface- and corner-cracked components.

    Keywords:

    crack, elastic analysis, stress-intensity factor, finite-element method, finite-element-alternating method, surface crack, corner crack, tension and bending loads


    Author Information:

    Raju, IS
    Senior scientist, Analytical Services and Materials, Inc., Hampton, VA

    Atluri, SN
    Regents' professor and director, Center for the Advancement of Computational Mechanics, Georgia Institute of Technology, Atlanta, GA

    Newman, JC
    Senior scientist, NASA Langley Research Center, Hampton, VA


    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP18829S