Journal
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
Volume 34, Issue 1, Pages 72-82Publisher
WILEY
DOI: 10.1111/j.1460-2695.2010.01495.x
Keywords
bearing steel; delta K-IIth; delta K-IIIth; shear-mode fatigue cracks; small cracks; torsional fatigue test
Funding
- Ministry of Education, Science, Sports and Culture [22560092]
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The fatigue behaviour of small, semi-elliptical surface cracks in a bearing steel was investigated under cyclic shear-mode loading in ambient air. Fully reversed torsion was combined with a static axial compressive stress to obtain a stable shear-mode crack growth in the longitudinal direction of cylindrical specimens. Non-propagating cracks less than 1 mm in size were obtained (i) by decreasing the stress amplitude in tests using notched specimens and (ii) by using smooth specimens in constant stress amplitude tests. The threshold stress intensity factor ranges, delta K-IIth and delta K-IIIth, were estimated from the shape and dimensions of non-propagating cracks. Wear on the crack faces was inferred by debris and also by changes in microstructure in the wake of crack tip. These effects resulted in a significant increase in the threshold value. The threshold value decreased with a decrease in crack size. No significant difference was observed between the values of delta K-IIth and delta K-IIIth.
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