Tribological contact analysis of a rigid ball sliding on a hard coated surface

Part III: Fracture toughness calculation and influence of residual stresses

Anssi Laukkanen, Henrik Holmberg (Corresponding Author), Jari Koskinen, Helena Ronkainen, Kim Wallin, Simo Varjus

Research output: Contribution to journalArticleScientificpeer-review

44 Citations (Scopus)

Abstract

The surface fracture mechanisms, that are the origin to wear, were analysed by three-dimensional finite element method (FEM) modelling on micro-level by stress and strain computer simulations and by experimental studies with a scratch tester. The studied tribological contact was a diamond ball sliding with increasing load on a thin titanium nitride (TiN) coating on a steel substrate. The ball was modelled as rigid, the coating linearly elastic and the steel substrate elastic–plastic taking into account strain hardening effects. In a sliding contact the first crack is initiated at the top of the coating from bending and pulling actions and it grows down through the coating. The effect of initial residual stress fields on coating cracking was approached by carrying out stress simulations with a pre-stressed coating. The stress fields near the indenter were found to relax by plastic deformation to such extent that the remaining stresses had only a marginal effect to macroscopic behavior. Fracture mechanical evaluation of crack driving force and fracture toughness were performed by determining stress intensity factor (SIF) solutions using boundary element analysis. SIF solutions were evaluated for crack fields of different density, location, crack angle, type of loading and mode of loading. The results were utilized to evaluate fracture characteristics and compute fracture toughness for the TiN to high speed steel coating substrate system.
Original languageEnglish
Pages (from-to)3824-3844
Number of pages21
JournalSurface and Coatings Technology
Volume200
Issue number12-13
DOIs
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed

Fingerprint

fracture strength
residual stress
sliding
balls
Fracture toughness
Residual stresses
coatings
Coatings
cracks
Steel
stress intensity factors
titanium nitrides
Cracks
steels
Titanium nitride
stress distribution
Stress intensity factors
Substrates
sliding contact
Insulator Elements

Keywords

  • surface coatings
  • stress modelling
  • fracture
  • scratch tester
  • fracture toughness
  • residual stresses
  • ProperTune

Cite this

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title = "Tribological contact analysis of a rigid ball sliding on a hard coated surface: Part III: Fracture toughness calculation and influence of residual stresses",
abstract = "The surface fracture mechanisms, that are the origin to wear, were analysed by three-dimensional finite element method (FEM) modelling on micro-level by stress and strain computer simulations and by experimental studies with a scratch tester. The studied tribological contact was a diamond ball sliding with increasing load on a thin titanium nitride (TiN) coating on a steel substrate. The ball was modelled as rigid, the coating linearly elastic and the steel substrate elastic–plastic taking into account strain hardening effects. In a sliding contact the first crack is initiated at the top of the coating from bending and pulling actions and it grows down through the coating. The effect of initial residual stress fields on coating cracking was approached by carrying out stress simulations with a pre-stressed coating. The stress fields near the indenter were found to relax by plastic deformation to such extent that the remaining stresses had only a marginal effect to macroscopic behavior. Fracture mechanical evaluation of crack driving force and fracture toughness were performed by determining stress intensity factor (SIF) solutions using boundary element analysis. SIF solutions were evaluated for crack fields of different density, location, crack angle, type of loading and mode of loading. The results were utilized to evaluate fracture characteristics and compute fracture toughness for the TiN to high speed steel coating substrate system.",
keywords = "surface coatings, stress modelling, fracture, scratch tester, fracture toughness, residual stresses, ProperTune",
author = "Anssi Laukkanen and Henrik Holmberg and Jari Koskinen and Helena Ronkainen and Kim Wallin and Simo Varjus",
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}

Tribological contact analysis of a rigid ball sliding on a hard coated surface : Part III: Fracture toughness calculation and influence of residual stresses. / Laukkanen, Anssi; Holmberg, Henrik (Corresponding Author); Koskinen, Jari; Ronkainen, Helena; Wallin, Kim; Varjus, Simo.

In: Surface and Coatings Technology, Vol. 200, No. 12-13, 2006, p. 3824-3844.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Tribological contact analysis of a rigid ball sliding on a hard coated surface

T2 - Part III: Fracture toughness calculation and influence of residual stresses

AU - Laukkanen, Anssi

AU - Holmberg, Henrik

AU - Koskinen, Jari

AU - Ronkainen, Helena

AU - Wallin, Kim

AU - Varjus, Simo

PY - 2006

Y1 - 2006

N2 - The surface fracture mechanisms, that are the origin to wear, were analysed by three-dimensional finite element method (FEM) modelling on micro-level by stress and strain computer simulations and by experimental studies with a scratch tester. The studied tribological contact was a diamond ball sliding with increasing load on a thin titanium nitride (TiN) coating on a steel substrate. The ball was modelled as rigid, the coating linearly elastic and the steel substrate elastic–plastic taking into account strain hardening effects. In a sliding contact the first crack is initiated at the top of the coating from bending and pulling actions and it grows down through the coating. The effect of initial residual stress fields on coating cracking was approached by carrying out stress simulations with a pre-stressed coating. The stress fields near the indenter were found to relax by plastic deformation to such extent that the remaining stresses had only a marginal effect to macroscopic behavior. Fracture mechanical evaluation of crack driving force and fracture toughness were performed by determining stress intensity factor (SIF) solutions using boundary element analysis. SIF solutions were evaluated for crack fields of different density, location, crack angle, type of loading and mode of loading. The results were utilized to evaluate fracture characteristics and compute fracture toughness for the TiN to high speed steel coating substrate system.

AB - The surface fracture mechanisms, that are the origin to wear, were analysed by three-dimensional finite element method (FEM) modelling on micro-level by stress and strain computer simulations and by experimental studies with a scratch tester. The studied tribological contact was a diamond ball sliding with increasing load on a thin titanium nitride (TiN) coating on a steel substrate. The ball was modelled as rigid, the coating linearly elastic and the steel substrate elastic–plastic taking into account strain hardening effects. In a sliding contact the first crack is initiated at the top of the coating from bending and pulling actions and it grows down through the coating. The effect of initial residual stress fields on coating cracking was approached by carrying out stress simulations with a pre-stressed coating. The stress fields near the indenter were found to relax by plastic deformation to such extent that the remaining stresses had only a marginal effect to macroscopic behavior. Fracture mechanical evaluation of crack driving force and fracture toughness were performed by determining stress intensity factor (SIF) solutions using boundary element analysis. SIF solutions were evaluated for crack fields of different density, location, crack angle, type of loading and mode of loading. The results were utilized to evaluate fracture characteristics and compute fracture toughness for the TiN to high speed steel coating substrate system.

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KW - fracture toughness

KW - residual stresses

KW - ProperTune

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