Volume 7, Issue 4 (December 1985)

    The Influence of Moisture and Toughened Resin on the Mixed Mode Fracture of Unidirectional Graphite/Epoxy Laminates

    CODEN: CTROAD

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    Abstract

    Hygrothermal effects on the fracture toughness of unidirectional graphite/epoxy laminates of two different grades have been investigated. The material systems used are Fiberite T300/1034 and the more ductile Fibredux T300/920.

    The fracture toughness in terms of the critical strain energy release rate Gc was measured for mixed-mode crack propagation along the fibers in off-axis specimens and in rail shear tests. By varying the off-axis angle, crack propagation occurred under different KI/KII ratios. It was observed that both moisturization of T300/1034 and change to the more ductile epoxy resin increases the critical strain energy release rate. When the toughened resin laminate had absorbed moisture, its toughness, however, decreased substantially.

    A scanning electron microscope was used to investigate the crack surfaces. Topographical differences caused by moisture and different KI/KII ratios were observed.

    The results were analyzed in terms of the quadratic mixed-mode fracture criteria.


    Author Information:

    Blikstad, M
    Research associate and professor of engineering materials, Linköping Institute of Technology, Linköping,

    Johannesson, TR
    Research associate and professor of engineering materials, Linköping Institute of Technology, Linköping,


    Stock #: CTR10307J

    ISSN: 0884-6804

    DOI: 10.1520/CTR10307J

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    Author
    Title The Influence of Moisture and Toughened Resin on the Mixed Mode Fracture of Unidirectional Graphite/Epoxy Laminates
    Symposium , 0000-00-00
    Committee D30