Transverse cracking is often the earliest failure mode of composite lami nates with off axis plies. These cracks usually cause stiffness reductions and thus adversely affect performance. In this article, a shear deformation model for the stress analysis of symmetric laminates with centrally located 90° plies subjected to transverse cracking is presented. Axial stiffness reduction predictions are compared with test data and results from other models for (0m/90n) s type cross-ply laminates. The shear deformation analysis is not limited to such laminates as demonstrated by predictions for (± 25/90n) s type lami nates.
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