Papers by Author: Yves Gaillard

Abstract: In this paper the formation of shear bands in columnar EB-PVD thermal barriers coatings is studied. In particular, critical parameters of nucleation of shear bands, such as contact pressure and initiation of cracks in the columns, are extracted from the experimental results. The pertinence of these parameters is discussed respecting to the stress field induced in the material during the indentation.

Abstract: This paper gives a short review of the instrumented indentation technique when applied to ceramic layered materials. The main causes of error are commented, together with the effect of the substrate, the microstructure and the possible fracture events.