Generalized evaluation method for determining transition crack length for microstructurally small to microstructurally large fatigue crack growth: Experimental definition, facilitation, and validation

Toshinobu Omura, Motomichi Koyama, Yasuaki Hamano, Kaneaki Tsuzaki, Hiroshi Noguchi

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We proposed a generalized method to determine the transition crack length from a microstructurally small to a microstructurally large crack growth, l0. Artificial errors are minimized in the data analysis process of the proposed method. In this study, we used low carbon steel specimens, each with eight micro notches (the ferrite grain size was 25 μm). The micro notches were introduced by focused ion beam technique, which is regarded as pre-cracks in steel. The obtained l0 (188 μm) agrees with previous studies. With the present specimen geometry, l0 can be determined using two specimens—an approach that is much easier than conventional methods.

Original languageEnglish
Pages (from-to)38-44
Number of pages7
JournalInternational Journal of Fatigue
Volume95
DOIs
Publication statusPublished - Feb 1 2017

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Fatigue Crack Growth
Evaluation Method
Fatigue crack propagation
Crack
Notch
Cracks
Steel
Focused ion beams
Low carbon steel
Ferrite
Crack propagation
Crack Growth
Grain Size
Geometry
Data analysis
Carbon

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Cite this

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T2 - Experimental definition, facilitation, and validation

AU - Omura, Toshinobu

AU - Koyama, Motomichi

AU - Hamano, Yasuaki

AU - Tsuzaki, Kaneaki

AU - Noguchi, Hiroshi

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AB - We proposed a generalized method to determine the transition crack length from a microstructurally small to a microstructurally large crack growth, l0. Artificial errors are minimized in the data analysis process of the proposed method. In this study, we used low carbon steel specimens, each with eight micro notches (the ferrite grain size was 25 μm). The micro notches were introduced by focused ion beam technique, which is regarded as pre-cracks in steel. The obtained l0 (188 μm) agrees with previous studies. With the present specimen geometry, l0 can be determined using two specimens—an approach that is much easier than conventional methods.

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