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    STP1020

    Strength of Stress Singularity and Stress-Intensity Factors for a Transverse Crack in Finite Symmetric Cross-Ply Laminates Under Tension

    Published: 01 January 1989


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    Abstract

    A theoretical investigation into the mechanics of the failure phenomenon of a composite laminate is presented. The study is specialized to the problem of a finite [0/90]s symmetric cross-ply composite laminate with a transverse through-crack under uniaxial tension. The stress field of such laminates is analyzed with particular emphasis on the stress singularity of the crack and the corresponding stress-intensity factors. The Lekhnitskii's method of complex stress functions for anisotropic bodies [1] is employed in the analysis of the strength of crack singularity. The crack problem is solved by analytic method, and the solution is expressed in the form of the sum of two infinite series of Fourier-hyperbolic functions supplemented by a singular term with predetermined order. Through numerical computation, the effects of the material constants and geometric parameters on the stress-intensity factors are obtained. They seem to furnish a reasonable explanation to the observed failure phenomenon.

    Keywords:

    transverse cracks, delamination, finite composite laminates, stress singularity, stress-intensity factors, material constants, geometric effects


    Author Information:

    Bai, J-M
    Graduate student, professor and director, Shanghai Jiao Tong University, Shanghai,

    Loo, T-T
    Graduate student, professor and director, Shanghai Jiao Tong University, Shanghai,


    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP18849S