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Delamination Analysis of UD Composites Using Interface Elements

For an accurate simulation of the mechanical behavior of laminated composites, several fracture modes should be considered. This work focuses on the numerical treatment of delamination within the framework of the finite element method. An interface element is presented which is written in terms of stress‐strain relationships. The constitutive law is mainly inspired by publications of De‐Andrés et al. [1] and Ortiz & Pandolfi [2]. A Smith‐Ferrante type cohesive free energy function is edited in a way that only tensile normal stresses trigger interlaminar damage. Furthermore, an additional penalty term avoids the interpenetration of the crack faces. The simulation of a DCB test shows the performance and the applicability of the model. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)