A study of fatigue fracture properties of high strength steel in high and extremely high cycle fatigue regions based on experimental and simulation methods

Kengo Fukazawa, Tomonaga Okabe, Jun Komotori, Masao Shimizu

Research output: Contribution to journalArticle

Abstract

In order to clarify experimentally the damage process for the high strength steel in high and extremely high cycle regions and to propose a simulation model based on a new approach, rotating bending fatigue tests were performed with special focus on the effect of the role of the inclusion on the fatigue properties of high strength steel. The transition of fatigue crack initiation site from surface inclusion to internal one was observed with decreasing stress amplitude. The simulation model was proposed on the basis of the concept of a risk competition of defects, in which a virtual specimen has been constructed in the computer program and all inclusions were assumed to be equivalent to a crack origin. The results of the simulation were almost in accordance with the experimental results, and it was shown that this model could make the prediction of fatigue life of high strength steel in high and extremely high cycle regions.

Original languageEnglish
Pages (from-to)617-625
Number of pages9
JournalNippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume69
Issue number3
Publication statusPublished - 2003 Mar
Externally publishedYes

Fingerprint

High strength steel
Fatigue of materials
Crack initiation
Computer program listings
Cracks
Defects

Keywords

  • Fatigue
  • Fish-eye failure
  • Fracture mechanism
  • High cycle fatigue
  • High strength steel

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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AU - Fukazawa, Kengo

AU - Okabe, Tomonaga

AU - Komotori, Jun

AU - Shimizu, Masao

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AB - In order to clarify experimentally the damage process for the high strength steel in high and extremely high cycle regions and to propose a simulation model based on a new approach, rotating bending fatigue tests were performed with special focus on the effect of the role of the inclusion on the fatigue properties of high strength steel. The transition of fatigue crack initiation site from surface inclusion to internal one was observed with decreasing stress amplitude. The simulation model was proposed on the basis of the concept of a risk competition of defects, in which a virtual specimen has been constructed in the computer program and all inclusions were assumed to be equivalent to a crack origin. The results of the simulation were almost in accordance with the experimental results, and it was shown that this model could make the prediction of fatigue life of high strength steel in high and extremely high cycle regions.

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