TY - CHAP N2 - Instability phenomena occurring in the microstructure of composite materials are investigated. To this aim, a complete description of the mechanical behavior of bi-material interfaces in composite materials requires the definition of both a cohesive law involving damage for the debonding stage, and a contact model during the closure of the interface. Both formulations are herein presented and implemented in the FE code FEAP. Numerical examples showing the transition from a snap-back instability to a stable mechanical response are presented. TI - Theoretical and numerical investigation on internal instability phenomena in composite materials SP - 5928 EP - 5933 ID - eprints1927 SN - 978-1-61782-063-2 N1 - 11th International Conference on Fracture, Turin, Italy, March 20-25, 2005 AV - none T2 - Proceedings of the 11th International Conference on Fracture 2005 (ICF11) PB - Curran Associates Y1 - 2005/// A1 - Carpinteri, Alberto A1 - Paggi, Marco A1 - Zavarise, Giorgio UR - http://eprints.imtlucca.it/1927/ ER -