Applicability of a FIB-notch as a small initial crack for fatigue limit evaluation

Junji Sakamoto, Yoshimasa Takahashi, Hiroshi Noguchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this study, we propose a method for assessing the applicability of an artificial defect 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 of ∼50 μm. Here, 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
Title of host publication19th European Conference on Fracture
Subtitle of host publicationFracture Mechanics for Durability, Reliability and Safety, ECF 2012
PublisherEuropean Conference on Fracture, ECF
ISBN (Print)978-5-905576-18-8
Publication statusPublished - Jan 1 2012
Externally publishedYes
Event19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012 - Kazan, Russian Federation
Duration: Aug 26 2012Aug 31 2012

Publication series

Name19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012

Conference

Conference19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012
CountryRussian Federation
CityKazan
Period8/26/128/31/12

Keywords

  • Fatigue crack growth
  • Fatigue limit
  • Initial small crack
  • Non-propagating crack
  • Reproducibility

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality

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  • Cite this

    Sakamoto, J., Takahashi, Y., & Noguchi, H. (2012). Applicability of a FIB-notch as a small initial crack for fatigue limit evaluation. In 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012 (19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012). European Conference on Fracture, ECF.