A design approach for components in ultralong fatigue life with step loading

Andrew Roiko (Corresponding Author), Y. Murakami

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

An overview of critical variables that affect fatigue failure with respect to steel components in ultralong life regimes is presented. The key role of hydrogen trapped by non-metallic inclusions in the ultralong life fatigue failure process is documented. The role of non-metallic inclusions on ultralong fatigue life is shown in the master curve of ODA (Optically Dark Area surrounding a non-metallic inclusion at fracture origin) growth. The master curve of ODA growth shows the correlation of the size of the ODA with the size of the non-metallic inclusion as it corresponds to fatigue life. The ability to predict the presence of
non-metallic inclusions in steels with extreme value methods is incorporated with the master curve of ODA growth to determine the maximum threshold stress for ultralong fatigue life using the √area parameter model. Most machine components experience variable loads in service. A design approach is introduced for calculating the effects of different loading levels for ultralong fatigue life.
Original languageEnglish
Pages (from-to)140-149
Number of pages10
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

Fatigue Life
Inclusion
Fatigue of materials
Steel
Curve
Extreme Values
Machine components
Fatigue
Hydrogen
Design
Predict

Keywords

  • Fatigue design
  • high strength steel
  • non-metallic inclusion
  • the area parameter model
  • ultralong fatigue life

Cite this

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title = "A design approach for components in ultralong fatigue life with step loading",
abstract = "An overview of critical variables that affect fatigue failure with respect to steel components in ultralong life regimes is presented. The key role of hydrogen trapped by non-metallic inclusions in the ultralong life fatigue failure process is documented. The role of non-metallic inclusions on ultralong fatigue life is shown in the master curve of ODA (Optically Dark Area surrounding a non-metallic inclusion at fracture origin) growth. The master curve of ODA growth shows the correlation of the size of the ODA with the size of the non-metallic inclusion as it corresponds to fatigue life. The ability to predict the presence of non-metallic inclusions in steels with extreme value methods is incorporated with the master curve of ODA growth to determine the maximum threshold stress for ultralong fatigue life using the √area parameter model. Most machine components experience variable loads in service. A design approach is introduced for calculating the effects of different loading levels for ultralong fatigue life.",
keywords = "Fatigue design, high strength steel, non-metallic inclusion, the area parameter model, ultralong fatigue life",
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A design approach for components in ultralong fatigue life with step loading. / Roiko, Andrew (Corresponding Author); Murakami, Y.

In: International Journal of Fatigue, Vol. 41, 2012, p. 140-149.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - A design approach for components in ultralong fatigue life with step loading

AU - Roiko, Andrew

AU - Murakami, Y.

PY - 2012

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AB - An overview of critical variables that affect fatigue failure with respect to steel components in ultralong life regimes is presented. The key role of hydrogen trapped by non-metallic inclusions in the ultralong life fatigue failure process is documented. The role of non-metallic inclusions on ultralong fatigue life is shown in the master curve of ODA (Optically Dark Area surrounding a non-metallic inclusion at fracture origin) growth. The master curve of ODA growth shows the correlation of the size of the ODA with the size of the non-metallic inclusion as it corresponds to fatigue life. The ability to predict the presence of non-metallic inclusions in steels with extreme value methods is incorporated with the master curve of ODA growth to determine the maximum threshold stress for ultralong fatigue life using the √area parameter model. Most machine components experience variable loads in service. A design approach is introduced for calculating the effects of different loading levels for ultralong fatigue life.

KW - Fatigue design

KW - high strength steel

KW - non-metallic inclusion

KW - the area parameter model

KW - ultralong fatigue life

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