The aim of this contribution is to present a new approach for assessing the effective strength of adhesive joints. The approach is based on the hybrid failure model as postulated by Leguillon in the framework of finite fracture mechanics. In this hybrid failure model formation of cracks of finite size is predicted if a stress criterion is fulfilled over the full virtual crack area and the incremental energy release rate reaches the fracture toughness. Effective strength predictions have been performed for single lap joints using the new hybrid failure model. Besides closed-form analytical models that are based on linear elasticity solutions a numerical model using the finite element method is presented. The results of the three models are shown and compared and their limitations are discussed.
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