In order to adapt to increasingly stringent CO2 regulations, the automotive industry must develop and evaluate low cost, low emission solutions in the powertrain technology. This often implies increased power density and the use of low viscosity oils, leading to additional challenges related to the durability of various machine elements. Therefore, an increased understanding of lubricated contacts becomes important where oil viscosity–pressure and compressibility–pressure behavior have been shown to influence the film thickness and pressure distribution in elastohydrodynamic lubrication (EHL) contacts, further influencing the durability. In this work, a finite line EHL contact is analyzed with focus on the oil compressibility–pressure and viscosity–pressure response, comparing two oils with relatively different behavior and its influence on subsurface stress concentrations in the contacting bodies. Results indicate that increased pressure gradients and pressure spikes, and therefore increased localized stress concentrations, can be expected for stiffer, less compressible oils, which under transient loading conditions not only affect the outlet but also the edges of the roller.
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March 2019
Research-Article
Influence of Lubricant Pressure Response on Subsurface Stress in Elastohydrodynamically Lubricated Finite Line Contacts
Tobias Hultqvist,
Tobias Hultqvist
Division of Machine Elements,
Department of Engineering Sciences and
Mathematics,
Luleå University of Technology,
Luleå 971 87, Sweden
e-mail: Tobias.Hultqvist@ltu.se
Department of Engineering Sciences and
Mathematics,
Luleå University of Technology,
Luleå 971 87, Sweden
e-mail: Tobias.Hultqvist@ltu.se
Search for other works by this author on:
Aleks Vrcek,
Aleks Vrcek
Division of Machine Elements,
Department of Engineering Sciences
and Mathematics,
Luleå University of Technology,
Department of Engineering Sciences
and Mathematics,
Luleå University of Technology,
Luleå 971 87
, Sweden
Search for other works by this author on:
Braham Prakash,
Braham Prakash
Division of Machine Elements,
Department of Engineering Sciences
and Mathematics,
Luleå University of Technology,
Department of Engineering Sciences
and Mathematics,
Luleå University of Technology,
Luleå 971 87
, Sweden
Search for other works by this author on:
Pär Marklund,
Pär Marklund
Division of Machine Elements,
Department of Engineering Sciences
and Mathematics,
Luleå University of Technology,
Department of Engineering Sciences
and Mathematics,
Luleå University of Technology,
Luleå 971 87
, Sweden
Search for other works by this author on:
Roland Larsson
Roland Larsson
Division of Machine Elements,
Department of Engineering Sciences and
Mathematics,
Luleå University of Technology,
Department of Engineering Sciences and
Mathematics,
Luleå University of Technology,
Luleå 971 87
, Sweden
Search for other works by this author on:
Tobias Hultqvist
Division of Machine Elements,
Department of Engineering Sciences and
Mathematics,
Luleå University of Technology,
Luleå 971 87, Sweden
e-mail: Tobias.Hultqvist@ltu.se
Department of Engineering Sciences and
Mathematics,
Luleå University of Technology,
Luleå 971 87, Sweden
e-mail: Tobias.Hultqvist@ltu.se
Aleks Vrcek
Division of Machine Elements,
Department of Engineering Sciences
and Mathematics,
Luleå University of Technology,
Department of Engineering Sciences
and Mathematics,
Luleå University of Technology,
Luleå 971 87
, Sweden
Braham Prakash
Division of Machine Elements,
Department of Engineering Sciences
and Mathematics,
Luleå University of Technology,
Department of Engineering Sciences
and Mathematics,
Luleå University of Technology,
Luleå 971 87
, Sweden
Pär Marklund
Division of Machine Elements,
Department of Engineering Sciences
and Mathematics,
Luleå University of Technology,
Department of Engineering Sciences
and Mathematics,
Luleå University of Technology,
Luleå 971 87
, Sweden
Roland Larsson
Division of Machine Elements,
Department of Engineering Sciences and
Mathematics,
Luleå University of Technology,
Department of Engineering Sciences and
Mathematics,
Luleå University of Technology,
Luleå 971 87
, Sweden
1Corresponding author.
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received May 15, 2018; final manuscript received October 8, 2018; published online November 29, 2018. Assoc. Editor: Yonggang Meng.
J. Tribol. Mar 2019, 141(3): 031502 (11 pages)
Published Online: November 29, 2018
Article history
Received:
May 15, 2018
Revised:
October 8, 2018
Citation
Hultqvist, T., Vrcek, A., Prakash, B., Marklund, P., and Larsson, R. (November 29, 2018). "Influence of Lubricant Pressure Response on Subsurface Stress in Elastohydrodynamically Lubricated Finite Line Contacts." ASME. J. Tribol. March 2019; 141(3): 031502. https://doi.org/10.1115/1.4041733
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