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A cohesive zone element formulation is developed for the bonding and debonding based on a tractionseparation law, where the focus is on the bonding and joining process due to plastic interface deformations. Regarding the strength of the interface bonding, a model correlating the interface bonding strength and interface stretch during roll bonding is proposed. Simulations have been done for roll bonding and a peeling test immediately after that. It is shown that the deeper the sheets get rolled, larger forces are necessary to peel them afterwards.