Stress Analysis on Layered Materials in Point Elastohydrodynamic-Lubricated Contacts |
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Authors: | Zhan-jiang Wang Wen-zhong Wang Hui Wang Yuan-zhong Hu |
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Affiliation: | (1) State Key Laboratory of Tribology, Tsinghua University, Beijing, People’s Republic of China;(2) School of Mechanical Vehicular Engineering, Beijing Institute of Technology, Beijing, People’s Republic of China |
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Abstract: | For multilayered or coated substrates in elastohydrodynamic-lubricated (EHL) contacts, the subsurface stress distributions
under a normal load combined with shear traction have been analyzed in this article through computer simulations. The Papkovich-Neuber
potentials and Fourier transform are adopted to deduce the pressure–displacement, pressure–stress, and shear traction–stress
response functions in frequency domain for the coated substrates, and to calculate distributions of pressure and subsurface
stress. The results from the analysis of EHL contacts on coated substrates are compared with those from dry contact model
in which shear traction is assumed to obey Coulomb’s law. Effects of the Young’s modulus of coatings, the properties of lubricants,
and the magnitude of traction are discussed. Similar to the results in dry contacts, hard coatings in lubricated cases tend
to increase the von Mises stress, whereas soft coatings decrease the stress. Shear traction makes the max von Mises stress
increasing and moving closer to surface. However, the changes in subsurface stress due to shear traction are less obvious
in lubricated contacts. Comparison between EHL and dry contact models reveals that lubrication can reduce the von Mises stress
in the coating layer due to smaller shear traction. The analyses show that pressure, film thickness, and subsurface stress
distributions are influenced by surface coatings, sliding velocity, rheological models, and pressure–viscosity behaviors. |
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Keywords: | Elastohydrodynamic lubrication (EHL) Contact mechanics Coatings Stress analysis |
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