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Cited by 6Tribology and Lubrication EngineeringGear and Bearing Dynamics AnalysisLubricants and Their Additives

Traction in EHL-Contacts : the influence of local fluid rheology and temperatures

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Bader, Norbert Fritz·2018·Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
DOI 10.15488/4459
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Abstract

The traction in concentrated contacts is governed by the fluid rheology. While the film formation has been well understood and its relation to the physical lubricant properties have been shown, the rheology governing the lubricant behaviour within elastohydrodynamic lubricated (EHL) contacts still poses numerous challenges. The limit of the traction transferable through a concentrated contact is governed by the lubricant property limiting shear stress. The behaviour of the limiting shear stress is evaluated by examining data from traction experiments. It is found that a linear relationship of pressure and maximum shear stress exists. The problem of using an integral contact is addressed by using data gained from a specialised experiment with homogeneous pressure. This shows the same pressure limiting shear stress relation. Thus the traction experiments are assumed a valid basis for extracting pressure limiting shear stress data. From the observations in the experiments a limiting shear stress relation is formulated and abstracted for several lubricants. This relation is subsequently implemented in a computational routine. The temperature dependence of the limiting shear stress is investigated by measurements of body temperature and by obtaining temperature maps of the contact through thermography. It can be found, that a small temperature dependence of the limiting shear stress may be present. However, when including the temperature maps into computations it is shown that the effect of temperature on viscosity out- weighs possible influences of temperature on the limiting shear stress. Furthermore, the knowledge of local temperatures makes the solution of the energy equation for a local temperature calculation unnecessary thus allowing for faster computations with the real temperat- ures. This is backed further by implementing several different viscosity models which are all based on identical high pressure viscometry data. It can be shown that the viscosity model influences the traction results substantially. Thus this work aims to achieve the following goals: Shed light on the true fluid behaviour in the EHL contact, point out the influence of temperature on the limiting shear stress, and further enhance a simple numerical model of the limiting shear stress for use in computations.

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  • The Barus model of viscosity is known to overestimate the viscosity at high pressures.

    “Purely for demonstration purposes, we apply the Barus model of the viscosity, though it is known to overestimate the viscosity at high pressures [69,70]:”

    From Enhancing practical modeling: A neural network approach for locally-resolved prediction of elastohydrodynamic line contacts (2024) · cites this paper as [69]

    Section 7.4.1 (page not provided) says that, for the mineral oil FVA 3 in the comparison studied, the Barus equation underestimates viscosity—the opposite of the attributed claim. Section 2.3.3 says viscosity models diverge at high pressures but does not say that Barus overestimates viscosity there. (LLM, conf=0.88)

    Checked by a reasoning model — may be wrong.

    Experimental — accuracy not yet measured

  • Real fluids are limited in the amount of shear stress they are able to transmit.

    “Real fluids are limited in the amount of shear stress they are able to transmit [36,69].”

    From Enhancing practical modeling: A neural network approach for locally-resolved prediction of elastohydrodynamic line contacts (2024) · cites this paper as [69]

    Section 2.5.3 says that most lubricants in EHL contacts have a maximum shear stress they cannot exceed. That supports the claim's central point, but the source limits it to most lubricants under EHL conditions, not real fluids generally. No page number is available in our copy. (LLM, conf=0.85)

    Experimental — accuracy not yet measured

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Authors
Bader, N. F.
Corresponding author
Bader, Norbert Fritz
ORCID
Bader, Norbert Fritz
Venue
Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Publisher
Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Published
2018
DOI
10.15488/4459
OpenAlex
W2936055119
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2024: 3 · 2023: 1 · 2022: 2
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  • Institutional Repository of Leibniz Universität Hannover (Leibniz Universität Hannover) (submittedVersion, cc-by-nc-nd)
  • Institutional Repository of Leibniz Universität Hannover (Leibniz Universität Hannover) (submittedVersion, other-oa)
  • University of Twente Research Information (submittedVersion, other-oa)
  • Leibniz Universität Hannover (cc-by)
Topics
  • Physical Sciences › Engineering › Mechanical Engineering › Tribology and Lubrication Engineering
  • Physical Sciences › Engineering › Mechanical Engineering › Gear and Bearing Dynamics Analysis
  • Physical Sciences › Engineering › Mechanical Engineering › Lubricants and Their Additives
Keywords
elastohydrodynamic lubrication, traction, limiting shear stress, lubricant rheology, concentrated contacts, temperature dependence, viscosity models, infrared thermography, film formation, energy equation

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

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