Interlaminar Stresses in Composite Laminates Under Out-of-Plane Shear/Bending

An approximate method is developed to investigate the interlaminar stresses near the free edges of beam-typecomposite laminate structures subjected to out-of-plane shear/bending. The method is based upon admissiblefunction representations for in-plane stresses that contain a linear variation in the longitudinal direction.Closed-form solutions of all stress components are sought by minimizing the complementary energy with respectto the unknown functions. The resulting solutions satisfy the stress equilibrium, compatibility, and all of theboundary conditions. Numerical examples are given for both cross-ply and angle-ply laminates. It is found thatinterlaminar stresses under the shear/bending, particularly those for angle-ply laminates, may exhibit substan-tially different characteristics than under uniaxial loading or under pure bending.

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