%T Theoretical and numerical investigation on internal instability phenomena in composite materials
%L eprints1922
%A Alberto Carpinteri
%A Marco Paggi
%D 2004
%B Atti del 17° Convegno Nazionale del Gruppo Italiano Frattura (IGF)
%O 17° Convegno Nazionale del Gruppo Italiano Frattura IGF17, Bologna, Italy, June 16-18, 2004
%I Gruppo Italiano Frattura
%P 136-141
%X 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.