Endommagement et rupture par délaminage dans un composite verre-epoxy sous sollicitations monotones et cycliques

Damage and fracture delamination in glass epoxy composite under static and cyclic loading

¹ Ingénieur Docteur, Enseignant, Chercheur à l’Université de Technologie de Compiègne.
² Ingénieur Docteur, Laboratoire d’Emission Acoustique, Service Essais et Mesures Physiques, CETIM, Sentis.

Abstract

In this paper, a study of mechanic and mechanisms of delamination in a glass cloth epoxy composite under static and cyclic loading is presented. The microscopic initiation is clearly pointed out by acoustic emission. The strain energy release rate is determined by compliance methods. The R curves show that the glass cloth epoxy material is tough. In fatigue, the delamination grows according to Paris law, and under variable loading the glass cloth epoxy composite does not show significant memory effect.

The microfractographic observation reveals the existence of fatigue striations in the fiber imprints and microcracks in the resine. Tomography shows a large damage zone ahead crack-tip.