Publication detail

On the Relation between Friction Increase and Grease Thickener Entraining on a Border of Mixed EHL Lubrication

ZAPLETAL, T. ŠPERKA, P. KŘUPKA, I. HARTL, M.

English title

On the Relation between Friction Increase and Grease Thickener Entraining on a Border of Mixed EHL Lubrication

Type

journal article in Web of Science

Language

en

Original abstract

This paper deals with an experimental study of film thickness and friction of commercial-grade grease and its base oil in a highly loaded contact. In-situ measurements were conducted for two surface textures on a ball-on-disc optical tribometer at the border of mixed lubrication. At high speeds, the film thickness and the friction of grease correspond with the base oil, while, the thickener enters the contact area and locally affects the film thickness and friction at low speeds. It was found out that the thickener starts to enter the contact area approximately at the same speed when the base oil friction increases on Stribeck curve but without direct solid to solid contact. It indicates that both effects can have the same origin. Change of lubricant flow in contact inlet area was discussed as a possible explanation.

English abstract

This paper deals with an experimental study of film thickness and friction of commercial-grade grease and its base oil in a highly loaded contact. In-situ measurements were conducted for two surface textures on a ball-on-disc optical tribometer at the border of mixed lubrication. At high speeds, the film thickness and the friction of grease correspond with the base oil, while, the thickener enters the contact area and locally affects the film thickness and friction at low speeds. It was found out that the thickener starts to enter the contact area approximately at the same speed when the base oil friction increases on Stribeck curve but without direct solid to solid contact. It indicates that both effects can have the same origin. Change of lubricant flow in contact inlet area was discussed as a possible explanation.

Keywords in English

film thickness; friction; grease; base oil; EHL

Released

29.01.2020

Publisher

MDPI

Location

BASEL

ISSN

2075-4442

Volume

8

Number

2

Pages from–to

1–11

Pages count

11

BIBTEX


@article{BUT170224,
  author="Tomáš {Zapletal} and Petr {Šperka} and Ivan {Křupka} and Martin {Hartl},
  title="On the Relation between Friction Increase and Grease Thickener Entraining on a Border of Mixed EHL Lubrication",
  year="2020",
  volume="8",
  number="2",
  month="January",
  pages="1--11",
  publisher="MDPI",
  address="BASEL",
  issn="2075-4442"
}