Strain energy release rate associated with local delamination in cracked composite laminates

J. Zhang, C. Soutis, J. Fan

    Research output: Contribution to journalArticlepeer-review


    In the present paper the total strain energy release rate GT associated with delaminations that initiate from a matrix crack in a symmetric composite laminate is calculated using the potential energy approach in elastic fracture mechanics and a two-dimensional finite element analysis. Two laminate stacking sequences, [ 02 904]s and [ ±25 904]s, are examined with a matrix crack in the 90° plies and delaminations growing uniformly from the matrix crack tip in the 0 90 and - 25 90 interfaces, respectively. The finite element analysis indicates that the Gl component (opening mode delamination) is reduced to zero for delamination length greater than one ply thickness; the shear mode (Mode II) dominates the growth of delamination. The total GT increases with increasing delamination length, but eventually approaches a constant asymptotic value, which is close to the GT result calculated from the analytical model. Finally, the analytical and numerical calculations show that G for local delamination decreases notably with increasing matrix cracking. © 1994.
    Original languageEnglish
    Pages (from-to)851-862
    Number of pages11
    Issue number9
    Publication statusPublished - Oct 1994


    • finite element analysis
    • local delamination
    • matrix cracking
    • strain energy release rate
    • symmetric laminates


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