Modelisation du transfert de contrainte dans les materiaux composites ceramiques a fibres continues a partir d'essais de microindentation instrumentee. cas du materiau composite hi-nicalon/bn/α-si 3n 4

Abstract

Microindentation tests have been used for analyzing the interfacial behaviour in HiNicalon/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.