Effect of off-axis ply orientation on 0°-fibre microbuckling

P. Berbinau, C. Soutis, P. Goutas, P. T. Curtis

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The aim of the present work is to study both experimentally and theoretically the compression failure mechanisms in multi-directional composite laminates, and especially the effect of the off-axis ply orientation on fibre microbuckling in the 0°-plies. The critical mechanism in the compressive fracture of unidirectional polymer matrix composites is plastic microbuckling/kinking. In multi-directional composites with internal 0°-plies, catastrophic failure also initiates by kinking of 0°-plies at the free-edges or manufacturing defects, followed by delamination. When 0°-plies are located at the outside, or in the case of cross-ply laminates, failure rather tends to occur by out-of-plane buckling of the °-plies. T800-924C carbon-fibre-epoxy laminates with a [(±θ/O2)2]s lay-up are used here to study the effect of the supporting ply angle θ on the stress initiation of 0°-fibre microbuckling. Experimental data on the compressive strength of laminates with θ equal to 30, 45, 60 or 75° are compared to theoretical predictions obtained from a fibre kinking model that incorporates interlaminar shear stresses developed at the free edges at (0/θ) interfaces. Initial misalignment of the fibres and non-linear shear behaviour the matrix are also included in the analysis.
    Original languageEnglish
    Pages (from-to)1197-1207
    Number of pages10
    JournalComposites Part A: Applied Science and Manufacturing
    Volume30
    Issue number10
    DOIs
    Publication statusPublished - Oct 1999

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