Energetic Study of Some States of Debonding in the Composite Structures

In this paper, a qualitative study is first given to show the influence of the laws of contact, imposed on the constituents interfaces(inclusions-matrix), as well as of type of composites and type of defects or decohesions, on the effective behavior of the "debonded" composite materials. A quantitative analysis is then discussed: we present an energy analysis of some model states of decohesion than may have a composite structure. This energetic study, based on the theory of Francfort and Marigo, consists primarily to reject, for a loading level and a given surface energy (in order of magnitude of e with e=1/n and where n denotes the number of fibers contained in the structure), the decohesions leading to highest energies of medium. The obtained results of this study are interesting, interesting insofar as they can be used in high tech industry to ensure that of this or that debonding can not appear in such composite pieces, subjected to loading of their use services.