Effect of load ratio on the deformation behaviour of fatigue crack tips

Masayuki Shimojo, M. Chujo, Y. Higo, S. Nunomura

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

To investigate the change in the manner of plastic deformation at a fatigue crack tip under different loading conditions, the fresh surface area which is produced in one fatigue cycle at the crack tip was measured by an electrochemical method under various load ratios. The fresh surface area produced in each fatigue cycle is in proportion to the crack propagation rate in the Paris regime. This indicates that the crack tip geometry at Kmax maintains a similar profile through the Paris regime. Furthermore, the fresh surface area is independent of load ratio at a given da/dN in the Paris regime. This suggests that the shape of the fatigue crack tip at Kmax should be independent of load ratio at a given da/dN, and that the shape at Kmin is also independent of load ratio, whereas the size of the deformed region at the crack tip is in proportion to da/dN.

Original languageEnglish
Pages (from-to)455-459
Number of pages5
JournalInternational Journal of Fatigue
Volume15
Issue number6
DOIs
Publication statusPublished - 1993
Externally publishedYes

Fingerprint

Crack tips
Fatigue of materials
Crack propagation
Plastic deformation
Fatigue cracks
Geometry

Keywords

  • fresh surface
  • load ratio
  • polarization current
  • propagation model

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Effect of load ratio on the deformation behaviour of fatigue crack tips. / Shimojo, Masayuki; Chujo, M.; Higo, Y.; Nunomura, S.

In: International Journal of Fatigue, Vol. 15, No. 6, 1993, p. 455-459.

Research output: Contribution to journalArticle

Shimojo, Masayuki ; Chujo, M. ; Higo, Y. ; Nunomura, S. / Effect of load ratio on the deformation behaviour of fatigue crack tips. In: International Journal of Fatigue. 1993 ; Vol. 15, No. 6. pp. 455-459.
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