Quantitative evaluation of the displacement distribution and stress intensity factor of fatigue cracks healed by a controlled high-density electric current field

Atsushi Hosoi, T. Yano, Y. Morita, Y. Ju

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Fatigue cracks were healed by controlling a high-density electric current. The changes in the displacement distribution around the crack tip and the stress intensity factor before and after crack healing were evaluated quantitatively with a digital image collation method. According to the results, it was determined that the cracks were closed by approximately 2 to 7-μm in this study. On the other hand, the stress intensity factor decreased or increased depending on the conditions of the crack and the current applied. The physical restriction between the crack surfaces, such as bridging, is important with respect to lowering the stress intensity factor after healing.

Original languageEnglish
Pages (from-to)1025-1033
Number of pages9
JournalFatigue and Fracture of Engineering Materials and Structures
Volume37
Issue number9
DOIs
Publication statusPublished - 2014
Externally publishedYes

Fingerprint

Electric currents
Stress intensity factors
Cracks
Crack tips
Fatigue cracks

Keywords

  • crack healing
  • digital image correlation
  • electric current
  • fatigue
  • stress intensity factor

ASJC Scopus subject areas

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

Cite this

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AU - Hosoi, Atsushi

AU - Yano, T.

AU - Morita, Y.

AU - Ju, Y.

PY - 2014

Y1 - 2014

N2 - Fatigue cracks were healed by controlling a high-density electric current. The changes in the displacement distribution around the crack tip and the stress intensity factor before and after crack healing were evaluated quantitatively with a digital image collation method. According to the results, it was determined that the cracks were closed by approximately 2 to 7-μm in this study. On the other hand, the stress intensity factor decreased or increased depending on the conditions of the crack and the current applied. The physical restriction between the crack surfaces, such as bridging, is important with respect to lowering the stress intensity factor after healing.

AB - Fatigue cracks were healed by controlling a high-density electric current. The changes in the displacement distribution around the crack tip and the stress intensity factor before and after crack healing were evaluated quantitatively with a digital image collation method. According to the results, it was determined that the cracks were closed by approximately 2 to 7-μm in this study. On the other hand, the stress intensity factor decreased or increased depending on the conditions of the crack and the current applied. The physical restriction between the crack surfaces, such as bridging, is important with respect to lowering the stress intensity factor after healing.

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KW - digital image correlation

KW - electric current

KW - fatigue

KW - stress intensity factor

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