relation: http://eprints.imtlucca.it/1922/ title: Theoretical and numerical investigation on internal instability phenomena in composite materials creator: Carpinteri, Alberto creator: Paggi, Marco subject: TJ Mechanical engineering and machinery description: 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. publisher: Gruppo Italiano Frattura date: 2004 type: Book Section type: PeerReviewed format: application/pdf language: en identifier: http://eprints.imtlucca.it/1922/1/IGF17p306_Paggi.pdf identifier: Carpinteri, Alberto and Paggi, Marco Theoretical and numerical investigation on internal instability phenomena in composite materials. In: Atti del 17° Convegno Nazionale del Gruppo Italiano Frattura (IGF). Gruppo Italiano Frattura, pp. 136-141. ISBN 8890108096 (2004)