ABSTRACT
Delaminations have been found to occur only at interfaces between plies which have different fiber orientations. To investigate how this difference in fiber orientation affects the damage, tests were performed with three types of plates. The first type consisted of 16 plies arranged as [04/θ4]s. The second type consisted of twenty-three 0 degree plies with an additional ply of θ orientation. The third type had five ply stacks of quasi-isotropic (45/0/-45/90) orientation (designated as π/4) followed by one stack with (90/-45/θ/45) orientation. By varying the angle θ, the mismatch angle was varied.
