Analysis of the stress transfer at the fibre-matrix interface in the case of ceramic matrix composites using instrumented microindentation tests: the Hi-Nicalon/BN/alpha-Si3N4 composite. [French]

摘要

Microindentation tests have been used for analyzing the interfacial behaviour in Hi-Nicalon/BN/Silicon nitride composites. When varying the maximum applied load and considering a constant interfacial shear stress, there was evidence of a Poisson's effect. A model, based on a Coulomb's law of friction, has been proposed to derive frictional stress values adjusted for the contribution of the expansion of the fibre. The advantages of this model are the explicit integration of all contributions to the clamping stress as well as the use of the experiment-based estimate of the roughness amplitude of Hi-Nicalon fibres. [References: 18]