Effect of nonlinear viscoelasticity of lubricants on piston ring lubrication

Jun Tomioka, Hirotsugu Hayashi, Sanae Wada

Research output: Contribution to journalArticle

Abstract

In recent years, engine oils have contained various kinds of additives such as high molecular-weight polymers to improve their performance. Such lubricants exhibit viscoelastic behavior, but the lubricants were assumed to be Newtonian fluids in most of the previous investigations on piston ring lubrication. The objective of this paper is to theoretically clarify the effect of nonlinear viscoelasticity of lubricants on piston ring lubrication by introducing a nonlinear four-element viscoelastic model which consists of two nonlinear dashpots and two nonlinear springs. Numerical solutions show that the effect of viscoelasticity reduces the frictional force and the film thickness. In addition, the phase of the variations of the frictional force and the film thickness of viscoelastic fluids is delayed compared with that of Newtonian fluids.

Original languageEnglish
Pages (from-to)2058-2065
Number of pages8
JournalNippon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
Volume57
Issue number538
Publication statusPublished - 1991 Jun
Externally publishedYes

Fingerprint

Piston rings
Viscoelasticity
Lubrication
Lubricants
Fluids
Film thickness
Diesel engines
Molecular weight
Polymers

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Effect of nonlinear viscoelasticity of lubricants on piston ring lubrication. / Tomioka, Jun; Hayashi, Hirotsugu; Wada, Sanae.

In: Nippon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C, Vol. 57, No. 538, 06.1991, p. 2058-2065.

Research output: Contribution to journalArticle

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