A simple analytical method using a sublaminate approach is introduced to analyze unidirectional and cross-ply laminates under torsion loading. Interlaminar stresses and total energy release rate are evaluated based upon a displacement field that includes shear deformation. Closed-form expressions for the interlaminar stresses and total strain energy release rate in terms of the laminate stiffness coefficients are provided. Two sublaminate models are used for the interlaminar stress analysis and for the delamination analysis. The method is applied to the analysis of 16 and [0/90]4s laminates made of IM6/3501-6 graphite/epoxy material. The interlaminar stress predictions are compared with a finite element simulation and an exact elasticity solution.
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