STP1290: Effect of Temperature and Fiber Coating on the Strength of E-Glass Fibers and the E-Glass/Epoxy Interface for Single-Fiber Fragmentation Samples Immersed in Water

    Schultheisz, CR
    Research engineers, Polymer Composites Group National Institute of Standards and Technology, Gaithersburg, MD

    Schutte, CL
    Research engineers, Polymer Composites Group National Institute of Standards and Technology, Gaithersburg, MD

    McDonough, WG
    Research engineers, Polymer Composites Group National Institute of Standards and Technology, Gaithersburg, MD

    Macturk, KS
    Post-doctoral fellow, guest researchers, and group leader, Polymer Composites Group, National Institute of Standards and Technology, Gaithersburg, MD

    McAuliffe, M
    Post-doctoral fellow, guest researchers, and group leader, Polymer Composites Group, National Institute of Standards and Technology, Gaithersburg, MD

    Kondagunta, S
    Post-doctoral fellow, guest researchers, and group leader, Polymer Composites Group, National Institute of Standards and Technology, Gaithersburg, MD

    Huntson, DL
    Post-doctoral fellow, guest researchers, and group leader, Polymer Composites Group, National Institute of Standards and Technology, Gaithersburg, MD

    Pages: 29    Published: Jan 1996


    Abstract

    The effect of absorbed moisture on the strengths of fibers and the fiber/matrix interface for an epoxy reinforced with continuous fibers of E-glass is under investigation. Single-fiber fragmentation tests of glass/epoxy model composites have shown degradation of the strengths of both the fiber and the interface after immersion in water. The fragmentation specimens were tested as-fabricated and after immersion in distilled water at 25 and 75°C for more than 4000 h. Two coatings were applied to the fibers, one epoxy-compatible and the other vinylester-compatible, in an effort to include the initial interfacial shear strength as a variable. Analyses of the fragmentation test results adapting the approach of Wagner and coworkers were used to determine moisture-induced changes in the fiber strength, making it possible to also evaluate changes in the interfacial strength.

    Keywords:

    durability, E-glass fibers, epoxy, interfacial strength, moisture, temperature, surface coatings


    Paper ID: STP38229S

    Committee/Subcommittee: D30.02

    DOI: 10.1520/STP38229S


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