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Simulation of Microtextured Surfaces in Starved EHL Contacts Using Commercial FE Software

Title data

Marian, Max ; Weschta, Martin ; Tremmel, Stephan ; Wartzack, Sandro:
Simulation of Microtextured Surfaces in Starved EHL Contacts Using Commercial FE Software.
In: Materials Performance and Characterization. Vol. 6 (May 2017) Issue 2 . - pp. 165-181.
ISSN 2165-3992

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

In order to improve the lubricating conditions and thus realize a reduction of friction and wear, the surfaces of contacting bodies in lubricated tribological contacts can be microtextured. Although this approach has already reached industrial applications for lower loaded contacts, it is still in basic research for higher loaded contacts, where elastic deformation plays a significant role. In the past, it was common in theoretical studies to assume a fully flooded condition for the inlet to the contact. However, in reality a lubricant contact may suffer from starvation due to high speeds, highly viscous lubricants, or limited lubricant supply. This article presents an efficient straightforward approach to compute starved microtextured elastohydrodynamic contacts based on a full-system approach and using commercial FE software. The numerical study on starvation is realized by shifting the position of the inlet meniscus toward the contact zone combined with the use of an appropriate cavitation model. Therefore, negative pressures are penalized by reducing the lubricant’s density, respectively its volume or mass fraction, with a penalty term. First, the implementation for the steady-state smooth-surface problem as well as the impact of decreasing lubricant supply on the film thickness are discussed as a reference case. Special is paid to proving suitability and validity of the used cavitation model for starvation problems. Subsequently, the influence of different degrees of starvation on film thickness and pressure distribution for a microtextured time-dependent demonstrator case is illustrated.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Tribology; Lubrication; Microtextured surfaces; Elastohydrodynamics; Finite-element-method; Penalty-variable-density; Cavitation model; Mass conservation; Starvation
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Engineering Design and CAD
Faculties > Faculty of Engineering Science > Former Professors > Chair Engineering Design and CAD - Univ.-Prof. Dr.-Ing. Frank Rieg
Profile Fields > Advanced Fields > Advanced Materials
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Faculties > Faculty of Engineering Science
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Emerging Fields
Faculties > Faculty of Engineering Science > Former Professors
Result of work at the UBT: No
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 14 Sep 2020 09:56
Last Modified: 14 Sep 2020 09:57