STP787

    Failure Characterization of a Graphite/Epoxy Laminate Through Proof Testing

    Published: Jan 1982


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    Abstract

    The object of the present work was to investigate the failure behavior of a [02/90/±45] AS/3501-5A graphite/epoxy laminate through proof testing. The primary emphasis was on the delineation of the effect of the proof test on the residual strength and life, the establishment of strength-life relations, and the identification of failure process. The test series consisted of static tests, tension-tension fatigue tests preceded by proof tests, and examinations of failure modes. Major findings can be summarized as follows: (1) Proof tests have little effect on the residual strength and life. (2) Strength and life are statistically interrelated so that a statically stronger specimen has a longer life. (3) A higher modulus is an indication of a higher strength and longer life. (4) The failure process of the present laminate is similar to that of the quasi-isotropic [0/90/±45]8 laminate. However, the crack multiplication in the present laminate is more extensive and faster. (5) Delamination surfaces consist of shiny and dull areas. The shiny areas have bare fibers, whereas the dull areas have fiber imprints in the epoxy.

    Keywords:

    fatigue, graphite/epoxy, proof testing, failure mode, ply failure, matrix cracking, delamination


    Author Information:

    Hahn, HT
    Associate Professor and Graduate Assistant, Washington University, St. Louis, Mo.

    Hwang, DG
    Associate Professor and Graduate Assistant, Washington University, St. Louis, Mo.


    Paper ID: STP28484S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP28484S


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