Mesoscale modelling of crack nucleation from defects in steel

E. Mikkola, G. Marquis (Corresponding Author), Jussi Solin

Research output: Contribution to journalArticleScientificpeer-review

18 Citations (Scopus)

Abstract

Defects such as pores and non-metallic inclusions have a significant influence on the long-life fatigue strength of high strength steels. The largest of these defects in a critical material volume is in the range of tens of micrometres which is on the same size scale as the grain size. At this scale materials are non-homogeneous since each grain in a polycrystalline material will have a different orientation. Finite element-based mesoscale modelling has been used to model the stress and strain in individual grains in the vicinity of a spherical defect. Microcrack nucleation and propagation models based on shear stress and plastic shear strain have been applied. Especially for low stress amplitudes near the endurance limit, critical grain orientation and defects are both essential for cracks to initiate and propagate.
Original languageEnglish
Pages (from-to)64-71
Number of pages8
JournalInternational Journal of Fatigue
Volume41
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed
EventInternational Symposium on Fatigue Design & Material Defects - Trondheim, Norway
Duration: 23 May 201125 May 2011

Fingerprint

Steel
Nucleation
Crack
Defects
Cracks
Modeling
Strategic materials
High Strength Steel
Fatigue Strength
Polycrystalline materials
Microcracks
Shear strain
Grain Size
High strength steel
Shear Stress
Crystal orientation
Shear stress
Plastics
Durability
Inclusion

Keywords

  • Defects
  • fatigue crack nucleation
  • high strength steel
  • martensitic steel
  • mesoscale modelling

Cite this

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Mesoscale modelling of crack nucleation from defects in steel. / Mikkola, E.; Marquis, G. (Corresponding Author); Solin, Jussi.

In: International Journal of Fatigue, Vol. 41, 2012, p. 64-71.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Mesoscale modelling of crack nucleation from defects in steel

AU - Mikkola, E.

AU - Marquis, G.

AU - Solin, Jussi

PY - 2012

Y1 - 2012

N2 - Defects such as pores and non-metallic inclusions have a significant influence on the long-life fatigue strength of high strength steels. The largest of these defects in a critical material volume is in the range of tens of micrometres which is on the same size scale as the grain size. At this scale materials are non-homogeneous since each grain in a polycrystalline material will have a different orientation. Finite element-based mesoscale modelling has been used to model the stress and strain in individual grains in the vicinity of a spherical defect. Microcrack nucleation and propagation models based on shear stress and plastic shear strain have been applied. Especially for low stress amplitudes near the endurance limit, critical grain orientation and defects are both essential for cracks to initiate and propagate.

AB - Defects such as pores and non-metallic inclusions have a significant influence on the long-life fatigue strength of high strength steels. The largest of these defects in a critical material volume is in the range of tens of micrometres which is on the same size scale as the grain size. At this scale materials are non-homogeneous since each grain in a polycrystalline material will have a different orientation. Finite element-based mesoscale modelling has been used to model the stress and strain in individual grains in the vicinity of a spherical defect. Microcrack nucleation and propagation models based on shear stress and plastic shear strain have been applied. Especially for low stress amplitudes near the endurance limit, critical grain orientation and defects are both essential for cracks to initiate and propagate.

KW - Defects

KW - fatigue crack nucleation

KW - high strength steel

KW - martensitic steel

KW - mesoscale modelling

U2 - 10.1016/j.ijfatigue.2011.12.022

DO - 10.1016/j.ijfatigue.2011.12.022

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VL - 41

SP - 64

EP - 71

JO - International Journal of Fatigue

JF - International Journal of Fatigue

SN - 0142-1123

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