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    STP1302

    Effect of Moisture on the Interfacial Shear Strength: A Study Using the Single Fiber Fragmentation Test

    Published: 01 January 1997


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    Abstract

    The effect of absorbed moisture on the interfacial strength of a carbon fiber/epoxy matrix composite has been studied using the single fiber fragmentation test. The absorption of 1.40% moisture produced a reduction less than 20% in the interfacial shear strength. This reduction in interfacial strength may be associated with a reduction in the residual compressive stresses at the fiber/matrix interface associated with the cooldown from the curing temperature, a weakening of the chemical adhesion, or a softening of the matrix giving failure by interphase yielding. These results suggest that long-term durability of carbon fiber/epoxy matrix composites in seawater may not be much affected by absorbed seawater.

    Keywords:

    polymeric composites, seawater, interfacial strength, single-fiber fragmentation test


    Author Information:

    Pratt, BA
    Research assistant and professor of mechanical engineering, respectively, Texas A&M University, College Station, TX

    Bradley, WL
    Research assistant and professor of mechanical engineering, respectively, Texas A&M University, College Station, TX


    Committee/Subcommittee: D30.05

    DOI: 10.1520/STP11368S