Volume 8, Issue 1 (March 1986)

    Influence of Interface Ply Orientation on Fatigue Damage of Adhesively Bonded Composite Joints

    CODEN: CTROAD

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    Abstract

    An experimental study of cracked-lap-shear specimens was conducted to determine the influence of adherend stacking sequence on debond initiation and damage growth in a composite-to-composite bonded joint. Specimens consisted of quasi-isotropic graphite/epoxy adherends bonded together with either FM-300 or EC 3445 adhesives. The stacking sequence of the adherends was varied such that 0°, 45°, or 90° plies were present at the adherend-adhesive interfaces. Fatigue damage initiated in the adhesive layer in those specimens with 0° and 45° interface plies. Damage initiated in the form of ply cracking in the strap adherend for the specimens with 90° interface plies. The fatigue-damage growth was in the form of delamination within the composite adherends for specimens with the 90° and 45° plies next to the adhesive, while debonding in the adhesive resulted for the specimens with 0° plies next to the adhesive. Those joints with the 0° and 45° plies next to either adhesive had essentially the same fatigue-damage-initiation stress levels. These stress levels were 13 and 71% higher, respectively, than those for specimens with 90° plies next to the EC 3445 and FM-300 adhesives.


    Author Information:

    Mall, S
    Associate professor, University of Missouri, Rolla, MO

    Johnson, WS
    Research engineer, NASA Langley Research Center, Hampton, VA


    Stock #: CTR10314J

    ISSN: 0884-6804

    DOI: 10.1520/CTR10314J

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    Author
    Title Influence of Interface Ply Orientation on Fatigue Damage of Adhesively Bonded Composite Joints
    Symposium , 0000-00-00
    Committee D30