Elastohydrodynamic lubrication analysis of pure squeeze motion on an elastic coating/elastic substrate system

Li Ming Chu, Chi Chen Yu, Qie Da Chen, Wang-Long Li

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A rigid sphere approaching a lubricated flat surface with a layer of elastic coating on the elastic substrate is explored under constant load conditions. The transient pressure profiles, film shapes, elastic deformation, von Mises stress (r von ) during the pure squeeze process under various operating conditions in the elastohydrodynamic lubrication (EHL) regime are discussed. The simulation results reveal that the greater the Young’s modulus of coating is, the greater the pressure distribution is, the smaller the contact area is, and the greater the maximum stress (r von ) value is. As the Young’s modulus of coating decreases, the central elastic deformation at the surface (Z ¼ 0) increases and the deformation at the interface of coating/substrate (Z ¼ 1) decreases. For hard coating cases, the maximum central pressure increases to an asymptotic value and minimum film thickness decreases to an asymptotic value as the coating thickness increases. For soft coating cases, this phenomenon reverses. A thicker and stiffer coating leads to a higher maximum stress. At the deformation recovery stage, the positions of the maximum stress would begin to offset downwards and closer to the coating/substrate interface. Moreover, the position of maximum stress varies from the coating to the subsurface as the Young’s modulus of coating increases. The EHL with stress analysis can prevent the chance of fracture in coating or substrate. These characteristics are important for the lubrication design of mechanical elements with coatings.

Original languageEnglish
Article number011503
JournalJournal of Tribology
Volume137
Issue number1
DOIs
Publication statusPublished - 2015 Jan 1

Fingerprint

elastohydrodynamics
Elastohydrodynamic lubrication
lubrication
coatings
Coatings
Substrates
modulus of elasticity
Elastic moduli
Elastic deformation
elastic deformation
transient pressures
Hard coatings
stress analysis
Stress analysis
Pressure distribution
pressure distribution
Lubrication
Film thickness

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

@article{cd60754cd70242e2abced22a57c34f01,
title = "Elastohydrodynamic lubrication analysis of pure squeeze motion on an elastic coating/elastic substrate system",
abstract = "A rigid sphere approaching a lubricated flat surface with a layer of elastic coating on the elastic substrate is explored under constant load conditions. The transient pressure profiles, film shapes, elastic deformation, von Mises stress (r von ) during the pure squeeze process under various operating conditions in the elastohydrodynamic lubrication (EHL) regime are discussed. The simulation results reveal that the greater the Young’s modulus of coating is, the greater the pressure distribution is, the smaller the contact area is, and the greater the maximum stress (r von ) value is. As the Young’s modulus of coating decreases, the central elastic deformation at the surface (Z ¼ 0) increases and the deformation at the interface of coating/substrate (Z ¼ 1) decreases. For hard coating cases, the maximum central pressure increases to an asymptotic value and minimum film thickness decreases to an asymptotic value as the coating thickness increases. For soft coating cases, this phenomenon reverses. A thicker and stiffer coating leads to a higher maximum stress. At the deformation recovery stage, the positions of the maximum stress would begin to offset downwards and closer to the coating/substrate interface. Moreover, the position of maximum stress varies from the coating to the subsurface as the Young’s modulus of coating increases. The EHL with stress analysis can prevent the chance of fracture in coating or substrate. These characteristics are important for the lubrication design of mechanical elements with coatings.",
author = "Chu, {Li Ming} and Yu, {Chi Chen} and Chen, {Qie Da} and Wang-Long Li",
year = "2015",
month = "1",
day = "1",
doi = "10.1115/1.4028916",
language = "English",
volume = "137",
journal = "Journal of Tribology",
issn = "0742-4787",
publisher = "American Society of Mechanical Engineers(ASME)",
number = "1",

}

Elastohydrodynamic lubrication analysis of pure squeeze motion on an elastic coating/elastic substrate system. / Chu, Li Ming; Yu, Chi Chen; Chen, Qie Da; Li, Wang-Long.

In: Journal of Tribology, Vol. 137, No. 1, 011503, 01.01.2015.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Elastohydrodynamic lubrication analysis of pure squeeze motion on an elastic coating/elastic substrate system

AU - Chu, Li Ming

AU - Yu, Chi Chen

AU - Chen, Qie Da

AU - Li, Wang-Long

PY - 2015/1/1

Y1 - 2015/1/1

N2 - A rigid sphere approaching a lubricated flat surface with a layer of elastic coating on the elastic substrate is explored under constant load conditions. The transient pressure profiles, film shapes, elastic deformation, von Mises stress (r von ) during the pure squeeze process under various operating conditions in the elastohydrodynamic lubrication (EHL) regime are discussed. The simulation results reveal that the greater the Young’s modulus of coating is, the greater the pressure distribution is, the smaller the contact area is, and the greater the maximum stress (r von ) value is. As the Young’s modulus of coating decreases, the central elastic deformation at the surface (Z ¼ 0) increases and the deformation at the interface of coating/substrate (Z ¼ 1) decreases. For hard coating cases, the maximum central pressure increases to an asymptotic value and minimum film thickness decreases to an asymptotic value as the coating thickness increases. For soft coating cases, this phenomenon reverses. A thicker and stiffer coating leads to a higher maximum stress. At the deformation recovery stage, the positions of the maximum stress would begin to offset downwards and closer to the coating/substrate interface. Moreover, the position of maximum stress varies from the coating to the subsurface as the Young’s modulus of coating increases. The EHL with stress analysis can prevent the chance of fracture in coating or substrate. These characteristics are important for the lubrication design of mechanical elements with coatings.

AB - A rigid sphere approaching a lubricated flat surface with a layer of elastic coating on the elastic substrate is explored under constant load conditions. The transient pressure profiles, film shapes, elastic deformation, von Mises stress (r von ) during the pure squeeze process under various operating conditions in the elastohydrodynamic lubrication (EHL) regime are discussed. The simulation results reveal that the greater the Young’s modulus of coating is, the greater the pressure distribution is, the smaller the contact area is, and the greater the maximum stress (r von ) value is. As the Young’s modulus of coating decreases, the central elastic deformation at the surface (Z ¼ 0) increases and the deformation at the interface of coating/substrate (Z ¼ 1) decreases. For hard coating cases, the maximum central pressure increases to an asymptotic value and minimum film thickness decreases to an asymptotic value as the coating thickness increases. For soft coating cases, this phenomenon reverses. A thicker and stiffer coating leads to a higher maximum stress. At the deformation recovery stage, the positions of the maximum stress would begin to offset downwards and closer to the coating/substrate interface. Moreover, the position of maximum stress varies from the coating to the subsurface as the Young’s modulus of coating increases. The EHL with stress analysis can prevent the chance of fracture in coating or substrate. These characteristics are important for the lubrication design of mechanical elements with coatings.

UR - http://www.scopus.com/inward/record.url?scp=85059867465&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85059867465&partnerID=8YFLogxK

U2 - 10.1115/1.4028916

DO - 10.1115/1.4028916

M3 - Article

VL - 137

JO - Journal of Tribology

JF - Journal of Tribology

SN - 0742-4787

IS - 1

M1 - 011503

ER -