Numerical Investigations on Dimensional and Geometrical Deviations of Surface Textures in EHL Contacts

Marian M, Tremmel S, Wartzack S (2019)

Publication Language: English

Publication Type: Conference contribution, Conference Contribution

Publication year: 2019

Event location: Sendai JP

Abstract

Micro-textures applied on rubbing surfaces of lubricated contacts have gained tremendous attention in the last two decades. Numerous experimental and numerical studies deal with the derivation and testing of advantageous micro-textures. Nevertheless, especially with respect to higher loaded elastohydrodynamically lubricated (EHL) rolling-sliding contacts, not all questions have been answered yet. Will texturing really provide as good effects as often claimed, and are there occasions when texturing could theoretically improve the tribological behavior but is questionable from other perspectives?

For these reasons, transient 3D simulations of micro-textured EHL line- and point-contacts based on the full-system approach were performed, which act as a ‘numerical zoom’ into the contact area and contribute to a better understanding of local phenomena. For the hydrodynamics, a modified Reynolds equation was applied. Based upon the finite element method (FEM), the elastic deformation was computed for an equivalent body by applying the linear elasticity equation. Moreover, for example time-dependent squeeze effects, mixed lubrication, microhydrodynamics and cavitation were to be considered.

Within this contribution, the effects of dimensional and geometrical deviations of discrete texture elements on lubricating conditions and thus friction and wear are addressed. This ranges from depth, length, width or flank angles of individual texture elements to the lateral distribution in and perpendicular to direction of sliding as well as the relative position of texture and contact area. It is shown that these deviations from nominal or optimized texture designs have a significant impact on the tribological performance, potentially overcompensating theoretical benefits. The findings emphasize the necessity for numerically derived optima and robust designs as well as manufacturing technologies with high precision to exploit the full potential of micro-texturing.

Authors with CRIS profile

Max Marian Chair of Engineering Design Stephan Tremmel Chair of Engineering Design Sandro Wartzack Chair of Engineering Design

How to cite

APA:

Marian, M., Tremmel, S., & Wartzack, S. (2019). Numerical Investigations on Dimensional and Geometrical Deviations of Surface Textures in EHL Contacts. In Proceedings of the International Tribology Conference Sendai 2019. Sendai, JP.

MLA:

Marian, Max, Stephan Tremmel, and Sandro Wartzack. "Numerical Investigations on Dimensional and Geometrical Deviations of Surface Textures in EHL Contacts." Proceedings of the International Tribology Conference Sendai 2019, Sendai 2019.

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