Research on the Contact Responses of Three-Dimensional Multilayer Structures Considering Multiscale Geometric Characteristics of Surfaces
The aero-engine blade disc works in the harsh environment of high temperature and high speed,which affect the mechanical behavior of the coating contact of the discontinuous blade-disk interfaces and the overall dynamic properties.In this paper,based on the three-dimensional elasticity theory,a contact model based on a multilayer half-space body is developed to investigate the contact responses between rough surfaces of multilayer structures.First,rough surface topography is decomposed into micro,mesoscopic and macro multi-level geometric profiles by explicit expression.Then,based on the Papkovich-Neuber potential function(P-N potential function),Fourier integral transform method and the influence coefficient method,a boundary constraint model for the multilayer contact problem is constrcuted,and is solved using a conjugate gradient algorithm.Finally,the reliability of the model is verified by comparing it with the analytical solution and the finite element results.Furthermore,a parametric study is performed to investigate the influcences of elastic modulus,Poisson's ratio and friction coefficient on the stress and displacement fields.This work provides a feasible and effective approach to study the contact response of rough interfaces of the coating systems.
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