STP893

    Modified Mircodebonding Test for Direct In Situ Fiber/Matrix Bond Strength Determination in Fiber Composites

    Published: Jan 1986


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    Abstract

    This paper describes a test method for determining the in situ fiber/matrix bond strength of composites. In a sequence of steps, a compressive load is applied to individual fibers oriented normal to a polished surface, and the interface is observed microscopically between loading steps, until debonding occurs. The direct result of a test is the force to produce debonding of a particular fiber. The data are reduced to a nominal interfacial shear strength through a finite-element analysis using a simplified model of the fiber, surrounding matrix, and uniform composite properties beyond the matrix. Bond strength results for a variety of composites range from 23 MPa for E-glass/polyester to 86 MPa for T300/5208 graphite/epoxy. The results are consistent with data available from other test methods.

    Keywords:

    composite materials, bond strength, interface, test methods, finite-element analysis


    Author Information:

    Mandell, JF
    Principal research associate, graduate student, graduate student and professor, Massachusetts Institute of TechnologyRohr Industries, Inc., CambridgeChula Vista, MACA

    Grande, DH
    Principal research associate, graduate student, graduate student and professor, Massachusetts Institute of TechnologyRohr Industries, Inc., CambridgeChula Vista, MACA

    Tsiang, T-H
    Principal research associate, graduate student, graduate student and professor, Massachusetts Institute of TechnologyRohr Industries, Inc., CambridgeChula Vista, MACA

    McGarry, FJ
    Principal research associate, graduate student, graduate student and professor, Massachusetts Institute of TechnologyRohr Industries, Inc., CambridgeChula Vista, MACA


    Paper ID: STP35343S

    Committee/Subcommittee: D30.07

    DOI: 10.1520/STP35343S


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