Effects of matrix cracking and hygrothermal stresses on the strain energy release rate for edge delamination in composite laminates

J. Zhang, C. Soutis, J. Fan

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A simple theoretical model based upon the equivalent constraint model1,2 and a sublaminate approach3 is used to determine the strain energy release rate, Ged, in [± θ{symbol}m 90n]s carbon/epoxy laminates loaded in tension. The analysis provides closed-form expressions for the reduced stiffness due to edge delamination and matrix cracking and the total strain energy release rate. The parameters controlling the behaviour are identified. The effect of laminate stacking sequence, matrix crack density and hygrothermal stresses on Ged is examined. Results show that the available energy for edge delamination is increased notably due to transverse ply cracking. Also, residual thermal stresses increase substantially the strain energy release rate and this effect is magnified by the presence of matrix cracking. Finally, predictions for the edge delamination onset strain are in acceptable agreement with experimental measurements. © 1994.
    Original languageEnglish
    Pages (from-to)27-35
    Number of pages8
    JournalComposites
    Volume25
    Issue number1
    Publication statusPublished - Jan 1994

    Keywords

    • cross-ply laminates
    • edge delamination
    • hygrothermal stresses
    • matrix cracking
    • stacking sequence
    • strain energy release rate

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