STP1290

    Direct Observation of Debonding in Fiber Pull-Out Specimens

    Published: Jan 1996


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    Abstract

    Single-fiber pull-out experiments under the microscope were compared with results from Instron pull-out experiments using the same glass fiber-room-temperature-cured epoxy system. It was found that when the loading system was stiff the pull-out curve obtained with the Instron had a transition which could be identified with the initiation of debonding, as seen under the microscope. Under these conditions debonding appeared to be a controlled fracture process. The work of fracture was about 70 ± 20 Jm-2, and was governed by an equivalent debonding shear stress of 44 ± 8 MPa. The yielding process was initiated at a shear stress of 25 ± 6 MPa. These results could be obtained using a very simple analysis because they were not affected by friction.

    Keywords:

    interface, debonding, failure, pull-out


    Author Information:

    Piggott, MR
    Professor Emeritus and graduate student, University of Toronto, Toronto,

    Xiong, Y
    Professor Emeritus and graduate student, University of Toronto, Toronto,


    Paper ID: STP38227S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP38227S


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