Method for assessing applicability of an artificial flaw as a small initial crack for fatigue limit evaluation and its application to a drill hole and an FIB processed sharp notch in annealed 0.45% carbon steel

Junji Sakamoto, Yoshimasa Takahashi, Yuuta Aono, Hiroshi Noguchi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In this study, we propose a method for assessing the applicability of an artificial flaw as a small initial crack for fatigue limit evaluation. The proposed method is applied to drill holes and sharp notches introduced using a focused ion beam (FIB) technique in annealed 0.45% carbon steel. It is found that under rotating bending fatigue, an FIB notch can be used as a small initial crack for fatigue limit evaluation, whereas a drill hole cannot, for √area of -50 μm. Here, √area is the square root of the area obtained by projecting the defect onto a plane perpendicular to the load axial direction. The results indicate that an FIB notch can be used as a small initial crack for fatigue limit evaluation in a greater number of materials than those in which a drill hole can be used.

Original languageEnglish
JournalJournal of Testing and Evaluation
Volume41
Issue number2
DOIs
Publication statusPublished - Mar 1 2013
Externally publishedYes

Fingerprint

Focused ion beams
Carbon steel
Fatigue of materials
Cracks
Defects
Axial loads

Keywords

  • Fatigue crack growth
  • Fatigue limit
  • Focused ion beam
  • Metal fatigue
  • Non-propagating crack
  • Small initial crack

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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abstract = "In this study, we propose a method for assessing the applicability of an artificial flaw as a small initial crack for fatigue limit evaluation. The proposed method is applied to drill holes and sharp notches introduced using a focused ion beam (FIB) technique in annealed 0.45{\%} carbon steel. It is found that under rotating bending fatigue, an FIB notch can be used as a small initial crack for fatigue limit evaluation, whereas a drill hole cannot, for √area of -50 μm. Here, √area is the square root of the area obtained by projecting the defect onto a plane perpendicular to the load axial direction. The results indicate that an FIB notch can be used as a small initial crack for fatigue limit evaluation in a greater number of materials than those in which a drill hole can be used.",
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AU - Sakamoto, Junji

AU - Takahashi, Yoshimasa

AU - Aono, Yuuta

AU - Noguchi, Hiroshi

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N2 - In this study, we propose a method for assessing the applicability of an artificial flaw as a small initial crack for fatigue limit evaluation. The proposed method is applied to drill holes and sharp notches introduced using a focused ion beam (FIB) technique in annealed 0.45% carbon steel. It is found that under rotating bending fatigue, an FIB notch can be used as a small initial crack for fatigue limit evaluation, whereas a drill hole cannot, for √area of -50 μm. Here, √area is the square root of the area obtained by projecting the defect onto a plane perpendicular to the load axial direction. The results indicate that an FIB notch can be used as a small initial crack for fatigue limit evaluation in a greater number of materials than those in which a drill hole can be used.

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