Abstract
In the present paper the crack opening displacement associated with delaminations that initiate from a matrix crack in a graphite-epoxy laminate (IM6/3501-6) subjected to mechanical and/or thermal loading is calculated using the sublaminate-wise first-order shear laminate theory and verified using a two-dimensional finite element analysis. The delamination induced crack opening displacement (DOD) for known delamination length and crack density is predicted for [0/902]S laminate system with a matrix crack in the 90o plies and delaminations growing uniformly from the matrix crack tip in the 0/90 interfaces. The effect of immediate neighboring ply orientation on DOD is studied by predicting DOD for the [θ/902]S (θ =0o to 90o) laminate system. In order to study the effect of stacking sequence on DOD, two laminate stacking sequences, [0/θ/902]S and [θ/0/902]S (θ =0o to 90o) are examined. It is seen for the examined laminates that the lay-up orientation of the ply adjacent to the 90oplies affects the DOD, whereas the stacking sequence of the neighboring ply groups do not influence the DOD significantly.
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