Local crack-tip strain concept for fatigue crack initiation and propagation

Heihachi Shimada, Yasubumi Furuya

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The existence of the unified local strain field where we can substantially combine the two fatigue stages, crack initiation and propagation, was experimentally confirmed. Using the fine-grid-method, the changes of local notch-root or crack-tip strain and these histories were investigated until the small elemental block of material was broken by crack initiation and propagation. It became clear that the crack-tip strain behavior and its fracture process showed the similarity with local strain damage accumulation on crack initiation process. Especially, when the local strain history in the “elementalsize, ρ*" adjacent to the crack-tip was taken into account, very good agreement of two stages could be obtained, ρ* depended on the kind of material. Based on this result, we have proposed a new idea termed “local crack-tip strain concept” that has the possibility for more simple, one parameter approach for future fatigue life analysis. It qualitatively differs from the currently used macroscopic, two parameters approach by combining the gross-strain (δεtotal) fatigue life curve and fracture mechanics parameter (δK).

Original languageEnglish
Pages (from-to)101-106
Number of pages6
JournalJournal of Engineering Materials and Technology, Transactions of the ASME
Volume109
Issue number2
DOIs
Publication statusPublished - 1987 Apr

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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