Optimisation of Interface Roughness and Coating Thickness to Maximise Coating-Substrate Adhesion - A Failure Prediction and Reliability Assessment Modelling

This paper addresses a novel modelling technique which is based on a multidisciplinary approach to predict the coating-substrate adhesion. It proposes new equations governing coating debondment that combines material science concepts with and solid mechanics concepts. The effects of two parameters i.e. interface roughness λ and coating thickness h on coating-substrate adhesion has been analysed. The reliability of newly developed technique has been validated by comparison with the experimental results

New tool materials with a structural gradient for milling applications

New hardmetals with a structural gradient for milling applications are investigated experimentally and numerically on several length scales. On the macroscale, milling tests are performed and a numerial model for up-milling is developed. On the mesoscale, the interaction of cracks with the graded surface zones, especially large soft binder islands are studied. On the microscale, the influence of shape and volume of such inclusions are investigated, further on, crack propagation in realistic microstructures is simulated. On the sub-microscale crack propagation and void growth in the ductile binder are modelled with crystal plasticity