In this work, a cohesive zone model of fracture is employed to study debonding in plastically deforming Al/epoxyT peeljoints. In order to model the adhesion between the bonded metal strips, the Park-Paulino-Roesler (PPR) potential based cohesive model (JMechPhysSolids, 2009; 57: 891- 908) is employed, and interface elements are implemented in a finite element com-mercial code. A study on the influence of the cohesive properties (i.e.cohesive strength, fracture energy, shape parameter and slope indicator) on the predicted peel-force versus displacement plots reveals that the numerical results are mostly sensitive to cohesive streng thand fracture en-ergy. Inturn, these parameters are tuned untilamatch between experimental and simulated load displacement curves is achieved.