The Experimental Analysis And Finite Element Formulation For Contact Problem Of Functionally Graded Materials Coating

Functionall y Graded Materials(FGMs) is one of the popular disciplines in the research field, because it had unique properties and potential research space. The functionally gradient coating inhibit ed the contact damage and destruction, so it had attracted widespread attention from mechanical workers. This paper investigated the three-dimensional contact problem of functionall y graded material with experiment and finite element. Firstl y, brinell hardness tester obtained the indentations of different material models; Secondl y, ABAQUS simulated the surface displacement of functionall y gradient coating under the concentrated load or circular uniforml y distributed load: The elastic modulus varying as differen t function respectivel y was considered. Finall y, ABAQUS simulated the frictionless contact problem of functionall y gradient coating under the rigid spherical indenter: The calculation results from finite element were compared with those solutions of formul a. At the same time, the affection of different form of elastic modulus on surface contact stress was anal yzed. The results showed that:Through the indentation tests b y the brinell hardness tester : The different material combination models caused signific ant impacts on pressure-indention curve. Otherwise, the gradient changes of material elastic modulus were the main factors to indentation test.ABAQUS effectivel y simulate d the surface displacement of functionall y gradient coating. In the meantime, ABAQUS simulated different functionall y graded materials models with material parameter varying as different functional formulations. Through the finite element calculations, elastic parameters of materials had great influence on the surface displacement of functionall y gradient coating under concentrated or uniformly distributed load.Supposing the functionall y gradient coating under spherical indenter with modulus of elasticit y varying exponentially, the radius of indentation, depth and contact stress decrease d with the decreasing of modulus of elasticit y. Meanwhile, when the elastic modulus ratio of top and bottom was fixed, the radius of indentation, depth and contact stress decrease d with the modulus of elasticit y varying as exponential function, linear funct ion and cosine function.The results had great value to the theoretical research on contact problem of functionall y gradient coating; at the same time, the research results also made significant guidance to the application of functionall y gradient material s in engineering.