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 language | English |
|---|---|
| Pages (from-to) | 1663-1670 |
| Number of pages | 8 |
| Journal | Journal of Materials Science |
| Volume | 15 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 1980 Jul |
| Externally published | Yes |
ASJC Scopus subject areas
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
- Materials Science(all)