Journal
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
Volume 223, Issue J5, Pages 767-776Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1243/13506501JET542
Keywords
rough surface; contact pressure; friction; finite element method; boundary element method; numerical analysis
Categories
Funding
- 'Austrian Kplus-Program'
- Austrian Research Promotion Agency
- Province of Niederosterreich (TecNet Capital GmbH)
- 'Austrian Center of Competence for Tribology'
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A novel formulation of elastic multi-asperity contacts based on the boundary element method (BEM) is presented for the first time, in which the influence coefficients are numerically calculated using a finite element method (FEM). The main advantage of computing the influence coefficients in this manner is that it makes it also possible to consider an arbitrary load direction and multilayer systems of different mechanical properties in each layer. Furthermore, any form of anisotropy can be modelled too, where Green's functions either become very complicated or are not available at all. The rest of the contact analysis is then performed applying a custom-developed boundary element algorithm. The scheme was tested by considering the frictionless contact between a flat surface and a sphere. The obtained results are in good agreement with the analytical solution known for a Hertzian contact. Applied to either a frictionless or a frictional contact between real surfaces of different samples, our FEM-BEM method has shown that the composite roughness of surfaces in contact uniquely determines the contact pressure distribution.
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