This article presents analytical formulas for determining mode I and II energy release rates for two cases: (a) cohesive fracture of adhesive joints and; (b) interlaminar delamination of layered beams. The formulas are firstly derived for calculating energy release rates GI and GII for a crack propagating in adhesive layer from one crack tip by using a classical beam-adhesive model. Then novel and simple closed-form formulas of G I and GII for an interface crack in layered beams are obtained by letting the adhesive thickness approach zero. In the present formulas, the effects of the asymmetry and each force component are clearly identified.
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