Volume 22, Issue 3 (July 2000)

    Scaling of First-Ply Failure and Strength in [+ϑn/−ϑ/−ϑn/90/902n]s Laminates: Experiments and Predictions

    CODEN: CTROAD

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    Abstract

    An experimental investigation of first-ply failure and strength was conducted on ply-level scaled carbon/epoxy composite laminates having a stacking sequence of [+ϑn/−ϑ/−ϑn/90/902n]s where the constraint ply angle, ϑ, was varied from 0 to 75°, and where the constraint ply angle, ϑ, was varied from 0 to 75°, and n varied from 1 to 4. First-ply failure was shown to depend on the level of constraint and the scale factor, n. The strain energy release rate for matrix microcracking was computed from first-ply failure data of the [02/902]s laminate. Then, first-ply failure for all other layups was predicted using a numerical model that accounted for both constraint and size. Tensile strength was predicted using a strain energy release rate model for delamination of surface angle plies. A delamination energy value for each ply angle was calculated from the thinnest (n = 1) laminates to predict strength of the other sizes.


    Author Information:

    Lavoie, JA
    Composite structures design and analysis consultant, Virginia Polytechnic Institute and State University, Blacksburg, VA

    Morton, J
    Director, Defence Evaluation and Research Agency, Farnborough, Hampshire,


    Stock #: CTR10635J

    ISSN: 0884-6804

    DOI: 10.1520/CTR10635J

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    Author
    Title Scaling of First-Ply Failure and Strength in [+ϑn/−ϑ/−ϑn/90/902n]s Laminates: Experiments and Predictions
    Symposium , 0000-00-00
    Committee D30