This study examines the delamination evolution, under quasi-static condi tions, of laminated polymeric composites with mechanically nonlinear resin rich inter faces. The constitutive behavior of the interface is represented by two models developed by Needleman [1] and Tvergaard [2]. These models assumed that the interfacial tractions, a function of only the interfacial displacement, will behave similarly to the interatomic forces generated during the interatomic separation. The interface material's parameters control the load at which the delamination growth initiates and the final delamination size. A wide range of damage accumulation responses have been obtained by varying the model parameters. These results show that Tvergaard's model has been found to be better suited of the two models in predicting damage evolution for the configurations examined.
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