Effective thermoelastic moduli of brittle matrix composite with interfacial debonding

The effects of interfacial debonding and fiber volume fraction on the mechanical and thermal properties of brittle matrix composite material were studied by using finite element method. Representative volume element of uni-symmetric debonding was used for the modeling of fibers and matrix constituting the Nicalon/Glass composite and numerical results were compared with those in case of doubly-symmetric debonding. In order to obtain the elastic, thermal moduli and Poisson´s ratios of composite material, stiffness constants were inverted. In case of symmetric geometry about x-axis, the properties according to symmetry axis were similar to those in case of double-symmetry but those in other directions were slightly different. It was found that the properties of brittle matrix composite were affected not only by the degree of debonding but also by the configuration of debonding between fibers and matrix in the composite materials.