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In this paper Cohesive Zone Model (CZM) concepts are applied in order to study mode I fracture in a pre-cracked bonded Double Cantilever Beam (DCB) specimen. A cohesive surface element is implemented in a Finite Element commercial code using intrinsic cohesive zone models: exponential, bilinear and trapezoidal traction-separation laws. The sensitivity of cohesive zone parameters in predicting the overall mechanical response is examined, then the load displacement curves obtained with the different CZMs are compared and some inter esting features concerning the prediction of damage onset in adhesive joints are illustrated. Fi nally, cohesive parameters are identified comparing numerically simulated load-displacement curves with experimental data retrieved from literature.