Fatigue striation in a wide range of crack propagation rates up to 70 μm/cycle in a ductile structural steel

C. Masuda, A. Ohta, S. Nishijima, E. Sasaki

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Abstract

The relationship between striation spacing and fatigue crack propagation rate up to 70 μm/cycle was investigated for a ductile structural steel, qualified as JIS SM58Q. A modified compact-type specimen 400 mm wide and a centre-cracked specimen 200 mm wide were tested at a stress ratio, R, of 0 and 0.8. The fracture surface of the specimen was examined in detail under a scanning electron microscope. The crack propagation rate was expressed by a power function of the range of stress intensity factor from 0.1 to 70 μm/cycle for R=0 and to 0.5 μm/cycle for R=0.8. The striation spacing coincided with the fatigue crack propagation rate over the range 0.1 to 70 μm/cycle. The profile of striation was found to be a "ridge and valley" type, and the ridges on one fracture surface coincided with those on the matching surface. It is suggested that the striation is formed by a plastic blunting mechanism.

Original languageEnglish
Pages (from-to)1663-1670
Number of pages8
JournalJournal of Materials Science
Volume15
Issue number7
DOIs
Publication statusPublished - 1980 Jul
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)

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