Tribological analysis of fracture conditions in thin surface coatings by 3D FEM modelling and stress simulations

Kenneth Holmberg (Corresponding Author), Anssi Laukkanen, Helena Ronkainen, Kim Wallin

Research output: Contribution to journalArticleScientificpeer-review

35 Citations (Scopus)

Abstract

A tribological analysis of deformations and stresses generated and their influence on crack generation and surface fracture in a coated surface loaded by a sliding sphere in dry conditions is presented. A three-dimensional finite element method (3D FEM) model has been developed for calculating the first principal stress distribution in the scratch tester contact of a diamond spherical tip with 200 μm radius sliding with increasing load on a 2 μm thick titanium nitride coated steel surface. The model is comprehensive in that sense that it considers elastic, plastic and fracture behaviour of the surfaces. The hard coating will be stretched and accumulates high tensile stresses. At the same time, it is carrying part of the load and thus reducing the compressional stresses in the substrate under the sliding tip. The first crack is initiated at the top of the coating from bending and pulling actions and it grows down through the coating. The fracture toughness of the coating is calculated by identifying from a scratch test experiment the location of the first cracks and the crack density and using this as input data.
Original languageEnglish
Pages (from-to)1035-1049
Number of pages15
JournalTribology International
Volume38
Issue number11-12
DOIs
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed

Fingerprint

cracks
Cracks
sliding
coatings
Finite element method
Coatings
simulation
Hard coatings
Diamond
Titanium nitride
titanium nitrides
Steel
pulling
fracture strength
test equipment
tensile stress
Tensile stress
stress distribution
Stress concentration
Fracture toughness

Keywords

  • Thin coating
  • Fracture
  • Scratch test
  • Stress modelling
  • Finite-element method
  • Fracture toughness
  • ProperTune

Cite this

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title = "Tribological analysis of fracture conditions in thin surface coatings by 3D FEM modelling and stress simulations",
abstract = "A tribological analysis of deformations and stresses generated and their influence on crack generation and surface fracture in a coated surface loaded by a sliding sphere in dry conditions is presented. A three-dimensional finite element method (3D FEM) model has been developed for calculating the first principal stress distribution in the scratch tester contact of a diamond spherical tip with 200 μm radius sliding with increasing load on a 2 μm thick titanium nitride coated steel surface. The model is comprehensive in that sense that it considers elastic, plastic and fracture behaviour of the surfaces. The hard coating will be stretched and accumulates high tensile stresses. At the same time, it is carrying part of the load and thus reducing the compressional stresses in the substrate under the sliding tip. The first crack is initiated at the top of the coating from bending and pulling actions and it grows down through the coating. The fracture toughness of the coating is calculated by identifying from a scratch test experiment the location of the first cracks and the crack density and using this as input data.",
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Tribological analysis of fracture conditions in thin surface coatings by 3D FEM modelling and stress simulations. / Holmberg, Kenneth (Corresponding Author); Laukkanen, Anssi; Ronkainen, Helena; Wallin, Kim.

In: Tribology International, Vol. 38, No. 11-12, 2005, p. 1035-1049.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Tribological analysis of fracture conditions in thin surface coatings by 3D FEM modelling and stress simulations

AU - Holmberg, Kenneth

AU - Laukkanen, Anssi

AU - Ronkainen, Helena

AU - Wallin, Kim

PY - 2005

Y1 - 2005

N2 - A tribological analysis of deformations and stresses generated and their influence on crack generation and surface fracture in a coated surface loaded by a sliding sphere in dry conditions is presented. A three-dimensional finite element method (3D FEM) model has been developed for calculating the first principal stress distribution in the scratch tester contact of a diamond spherical tip with 200 μm radius sliding with increasing load on a 2 μm thick titanium nitride coated steel surface. The model is comprehensive in that sense that it considers elastic, plastic and fracture behaviour of the surfaces. The hard coating will be stretched and accumulates high tensile stresses. At the same time, it is carrying part of the load and thus reducing the compressional stresses in the substrate under the sliding tip. The first crack is initiated at the top of the coating from bending and pulling actions and it grows down through the coating. The fracture toughness of the coating is calculated by identifying from a scratch test experiment the location of the first cracks and the crack density and using this as input data.

AB - A tribological analysis of deformations and stresses generated and their influence on crack generation and surface fracture in a coated surface loaded by a sliding sphere in dry conditions is presented. A three-dimensional finite element method (3D FEM) model has been developed for calculating the first principal stress distribution in the scratch tester contact of a diamond spherical tip with 200 μm radius sliding with increasing load on a 2 μm thick titanium nitride coated steel surface. The model is comprehensive in that sense that it considers elastic, plastic and fracture behaviour of the surfaces. The hard coating will be stretched and accumulates high tensile stresses. At the same time, it is carrying part of the load and thus reducing the compressional stresses in the substrate under the sliding tip. The first crack is initiated at the top of the coating from bending and pulling actions and it grows down through the coating. The fracture toughness of the coating is calculated by identifying from a scratch test experiment the location of the first cracks and the crack density and using this as input data.

KW - Thin coating

KW - Fracture

KW - Scratch test

KW - Stress modelling

KW - Finite-element method

KW - Fracture toughness

KW - ProperTune

U2 - 10.1016/j.triboint.2005.07.028

DO - 10.1016/j.triboint.2005.07.028

M3 - Article

VL - 38

SP - 1035

EP - 1049

JO - Tribology International

JF - Tribology International

SN - 0301-679X

IS - 11-12

ER -