Abstract
Analytical expressions for the energy release rate and mode-mixity phase angle are derived for a sandwich composite double-cantilever beam fracture specimen with the face sheets reinforced by stiff plates. The sandwich beam is considered symmetric, with identical top and bottom facesheets. Only a pure moment loading is considered. The -integral coupled with laminate beam theory is employed to derive closed-form expression for the energy release rate in terms of the applied moments, geometry, and material properties. A scalar quantity is obtained to express the mode-mixity phase angle. It is shown that is independent of the applied loading conditions. The value of is found to be moderately influenced by reinforcement thicknesses.
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