Analysis of Interlaminar Mode II Bending Specimens Using a Higher Order Beam Theory

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Abstract
A higher order beam theory is used to analyze two Mode II interlaminar bending specimen geometries. The theory is based on second order displacements in the thickness coordinate and is derived in conjunction with Reissner's variational principle. Homogeneous orthotropic materials are considered. Both the inplane normal stress and the interlaminar shear stress distributions exactly satisfy the equilibrium equations of clas sical theory of elasticity. The resulting field equations are applied to an analysis of the end notch flexure (ENF) specimen and end notch cantilever (ENC) specimen. Numerical results from the present theory are compared to those obtained from finite elements for the end notch flexure specimen. Excellent agreement is obtained.
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