STP521

    Method for Estimating Fracture Strength of Specially Orthotropic Composite Laminates

    Published: Jan 1973


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    Abstract

    A method is presented for estimating the stress intensity factor characteristic of crack extension in a specially orthotropic advanced fiber composite laminate, based on the elastic properties and ultimate principal strengths of a lamina, the laminate construction, and the experimentally determined value of the characteristic stress intensity factor of an arbitrary angle-plied, midplane symmetric laminate. A comparison of the results obtained from this method with limited experimental data for graphite/epoxy laminates indicates that the method is quite accurate for this particular material system.

    The predictive method is also used, in conjunction with experimental data, to estimate the size of a damage zone surrounding the crack tip. The implications of the size of this damage zone are discussed briefly.

    Keywords:

    composite materials, laminates, fibers, fracture strength, stresses, crack propagation, fracture tests


    Author Information:

    Konish, HJ
    Graduate student and associate professors, Carnegie Institute of Technology, Carnegie-Mellon University, Pittsburgh, Pa.

    Cruse, TA
    Graduate student and associate professors, Carnegie Institute of Technology, Carnegie-Mellon University, Pittsburgh, Pa.

    Swedlow, JL
    Graduate student and associate professors, Carnegie Institute of Technology, Carnegie-Mellon University, Pittsburgh, Pa.


    Paper ID: STP36482S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP36482S


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