Cractérisation et simulation numérique du comportement mécanique de l'abradable

Abstract

Abradable materials are used in the electrical and aeronautical industries to minimize clearance between the blade tips and the crankcase, which in turn increases engine efficiency. The principle is based on a characterization of this coating since its synthesis of powders, and then study its microstructure by evaluating its porosity, hardness and adhesion. The proposed approach to identifying the law of behavior is based on the combination of experimental tests and finite elements. Given the complexity of the structure of these deposits, non-standard tests have been proposed to assess the deformation capacity of the abradable. The modeling based on the real images has been done in order to estimate the elastic properties. Validation of this approach is performed by the HR15Y hardness test. The combination of the compression test, the finite element analysis and the inverse analysis to extract the elastoplastic properties of the deposit. The outcome of all these spots serve as input for various calculation modes that were performed to simulate the dawn / Ni-graphite coating interaction phenomenon.