[309] Mathematical modelling and sensor-based prediction and prognostic of thin coating failures

This paper presents fracture and blistering failures of thin coating. Classical fracture mechanics principles have been compared within the context of variable application conditions. A mathematical modelling approach has been developed to incorporate interfacial properties of the coating and the coated surface, the interfacial coefficient, surface roughness, material mechanical properties and environmental or atmospheric parameters. Mechanical and materials properties included elastic moduli and chemical composition. Physical parameters included coating thickness. Atmospheric conditions included temperature, pressure, humidity ratio and atmospheric quality. A diffusion study has been conducted to understand blister initiation, propagation and failure of coatings due to blister phenomena. Surface analyses are presented and discussed for all types of thin coating. A mechanistic analysis is presented and the development of a novel Khan-Nazir model, including blister pressure, has been discussed. The application of novel mathematical modelling for in-situ and remote prediction and prognostic techniques applied to coating failures is presented.
Keywords: nanocoating, wear, corrosion, modelling, simulation, condition monitoring.