Abstract
An extended cohesive damage model (ECDM) has been recently developed by authors for predicting multicrack failure mechanism in fibre composite materials [1-4]. The ECDM is a fully condensed extended finite element method (XFEM) formulation with enriched degree of freedoms eliminated. The effects from enrichment and cohesive force are accounted into the fully condensed FEM formulation. An equivalent damage scalar relating to a strain filed is introduced in terms of energy dissipation during the post-failure process to characterize the damage evolution. This paper briefly presents the basic ECDM formulation and its application of predicting multi-delamination in sandwich composites. This investigation proves the rubout capability of the ECDM in predicting multi-delamination in sandwich composites with great computational efficiency.