Effect of friction on the contact stress of a coated polymer gear

Su-Min BAE; Kuk-Jin SEO; Dae-Eun KIM

doi:10.1007/s40544-020-0363-6

Friction 2020, 8(6): 1169-1177 https://doi.org/10.1007/s40544-020-0363-6

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Open Access | Issue | Published: 27 July 2020

Effect of friction on the contact stress of a coated polymer gear

Show Author's Information Hide Author's Information Su-Min BAE, Kuk-Jin SEO, Dae-Eun KIM(

)

Department of Mechanical Engineering, Yonsei University, Seoul 03722, Republic of Korea

Keywords:

friction, coating, contact stress, finite element method (FEM), polymer gear

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BAE S-M, SEO K-J, KIM D-E. Effect of friction on the contact stress of a coated polymer gear. Friction, 2020, 8(6): 1169-1177. https://doi.org/10.1007/s40544-020-0363-6

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Abstract

Polymer gears are used extensively in various applications. However, durability issues have been emerging because of friction at gear tooth contact areas. To extend the lifetime of polymer gears, a low-frictional coating has been considered as a possible strategy. In this study, a finite element simulation method was performed to investigate the contact stress between a pair of coated polymer gears. The simulation included various friction coefficients (COFs) for studying the effects of friction during the operation. Numerical results revealed that the friction causes the contact stress to shift over the roll angle, which is attributed to the direction of the sliding friction based on a free-body diagram. We also investigated the effects of coating and found that a thin coating has little effect on the bulk deformation behavior of the gear. Moreover, the stress distribution in the coating at the pitch point was investigated as the COF increased. Under zero friction, three notable stress regions were observed: 1) the center of the surface, 2) the end of the contact, and 3) the overall contact area. As COF was increased in the micro-slip region of the contact interface, both tensile and compressive stresses in the coating increased. This study provides significant aid to engineers for understanding the stress response of the coating applied to polymer gears to achieve an optimal design.

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Effect of friction on the contact stress of a coated polymer gear

Show Author's information Hide Author's Information Su-Min BAE, Kuk-Jin SEO, Dae-Eun KIM(

)

Department of Mechanical Engineering, Yonsei University, Seoul 03722, Republic of Korea

Abstract

Keywords: friction, coating, contact stress, finite element method (FEM), polymer gear

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Acknowledgements

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Publication history

Received: 31 August 2019

Revised: 20 December 2019

Accepted: 04 January 2020

Published: 27 July 2020

Issue date: December 2020

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Acknowledgements

This study was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIT) (No. 2019R1H1A2039657).

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