Carpinteri, Alberto and Paggi, Marco
Theoretical and numerical investigation on internal instability phenomena in composite materials.
Atti del 17° Convegno Nazionale del Gruppo Italiano Frattura (IGF).
Gruppo Italiano Frattura, pp. 136-141.
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
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