Expertise of Mechanisms of Delamination in Composite Materials

In composite materials, the cracks appear by intralaminar decohesion a little ahead of the delamination front under the action of tri-axial stresses before any decohesion at the interfaces between layers. The actual phenomenon of delamination is caused by previous damaging of the resin ahead of the front resulting first in the formation of intralaminar cracks. The microscopic mechanisms involve numerous changes of planes formation during delamination, so that delamination cannot he considered, in any case, as a simple decohesion between two adjacent layers. Analysis of damaging mechanisms supported by scanning electron microscope (SEM) observations gave useful information about the conception and design of long fiber reinforced composite materials. In this paper we carried out a synthesis on the mechanisms of fracture of composite materials by delamination which was proved by SEM photographs. Then we have given suggestions for realization of these materials.

Keywords:

Fracture mechanic , Composite material , Delamination , Damaging mechanism , SEM