Modeling of randomly distributed coated fibers in a ceramic matrix composite

Abstract

A numerical model is developed to create a periodic unit cell (PUC) for a randomly distributed coated fibers in a ceramic matrix composite (CMC). Virtual force dispersion algorithm is applied to construct PUCs that have a realistic fiber pattern. Finite element analysis (FEA) is performed on the PUCs with several distinct microstructural features based on the microscopic observation of a CMC specimen. FEA results show that the global stress-strain response of the CMC material is greatly influenced by the fiber distribution pattern and the fracture behavior is dominantly affected by the coatings.