STP876

    Energy Release Rate During Delamination Crack Growth in Notched Composite Laminates

    Published: Jan 1985


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    Abstract

    The elastoplastic nature of delamination crack growth in composite laminates is discussed. A simple estimation of the local elastic strain energy release rate in the presence of plasticity (IL) is made, and used as a criterion for stable delamination crack growth in notched composite laminates. A three-dimensional elastoplastic, generally orthotropic finite-element method is used for the analysis. The finite-element techniques developed for estimating IL (in Mode I, Mode II, Mode III, and mixed-mode fracture) and for crack growth simulation are described. The analysis has been used to predict the initiation and growth of delamination near through-the-thickness cracks in central and single-edge notched [±45/0]s graphite/epoxy laminates subjected to static in-plane tensile stresses normal to the notches. Delamination between +45/−45 and −45/0 interfaces and material yielding at different stages of loading are presented. Numerical results demonstrate that the proposed elastoplastic fracture criterion is very effective in predicting stable delamination crack growth in composite laminates having nonlinear matrix-dominated properties.

    Keywords:

    elastoplastic fracture mechanics, delamination, energy release rate, notched composite laminates, elastoplastic three-dimensional finite-element analysis


    Author Information:

    Mahishi, JM
    Graduate Student and ProfessorResearch Engineer, University of WyomingConcept Analysis Corporation, LaramiePlymouth, WYMI

    Adams, DF
    Graduate Student and ProfessorResearch Engineer, University of WyomingConcept Analysis Corporation, LaramiePlymouth, WYMI


    Paper ID: STP36301S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP36301S


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