Abstract
Coating is an effective way to reduce friction and wear and to improve the contact-fatigue lives of gear components, which further guarantees a longer service life and better reliability of industrial machinery. The fact that the influence coefficient linking the tractions and stress components could not be expressed explicitly increases the difficulty of coated solids contact analysis. The complicated tribological behavior between tooth surfaces influenced by lubrication and surface roughness further adds difficulty to the coated gear pair contact problems. A numerical elastohydrodynamic lubricated (EHL) contact model of a coated gear pair is proposed by considering the coupled effects of gear kinematics, coating properties, lubrication, and surface roughness. The frequency response function and the discrete convolute, fast Fourier transformation (DC-FFT) method are combined to calculate the surface deformation and the subsurface stress fields at each meshing position along the line of action (LOA). The Ree-Eyring fluid is assumed to incorporate the non-Newtonian effect, which is represented in the generalized Reynolds equation. Influences of the ratio between the Young’s modulus of the coating and the substrate on the contact performance, such as pressure, film thickness, tooth friction coefficient, and subsurface stress field, are studied. The effect of the root mean square (RMS) value of the tooth surface roughness is studied by introducing the roughness data, deterministically measured by an optical profiler.
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This project is supported by the National Natural Science Foundation of China (Nos. 51775060, 51535012, and 51575061).
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Huaiju LIU. He was born in 1986, and received his PhD degree in mechanical engineering from the University of Warwick, UK in 2013. He joined the State Key Lab of Mechanical Transmissions at Chongqing University from 2013. His research areas cover tribology and fatigue of mechanical elements. He had published more than 30 international journal papers.
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Liu, H., Liu, H., Zhu, C. et al. Tribological behavior of coated spur gear pairs with tooth surface roughness. Friction 7, 117–128 (2019). https://doi.org/10.1007/s40544-017-0193-3
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DOI: https://doi.org/10.1007/s40544-017-0193-3