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In the present paper the total strain energy release rate G associated with delaminations that initiate from a matrix crack in a [±θ m /90 n ] s  composite laminate is calculated using the potential energy approach in elastic fracture mechanics. The predictions are compared with a two-dimensional finite element analysis. It is found that for delamination lengths greater than two-ply thicknesses the theoretical and numerical results are in good agreement. The new model shows that G is affected by the matrix crack density and residual hygrothermal stresses.

Analysis of Local Delamination in A Cracked Composite Laminate Loaded in Tension