Author(s)

M. Muzzupappa

Abstract

Measurement of residual stresses in ceramic coatings by a stress relaxation technique: numerical calibration and experimental procedures M. Muzzupappa Department of Mechanical Engineering, University of ABSTRACT One property of ceramic coatings that limits their use is the tendency to crack under load. In order to predict the behaviour under load and the lifetime of a coated component, it is necessary that the residual stress state can be evaluated. This paper describes an integrated numerical-experimental destructive method which is based on the stress relaxation caused by the removal of part of the coating. The results obtained can be used for assessing and calibrating the x-ray diffraction technique. INTRODUCTION The feasibility of depositing ceramic coatings on metallic substrates enables components to be obtained where the advantages of both materials are present and their drawbacks avoided; each material has, in fact, a different role: the ceramic coating acts as a t

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