Fatigue crack initiation from small defects under low stress ratios in SAE52100 bearing steel

Y. Hino; H. Matsunaga

doi:10.1117/12.852684

14 April 2010 Fatigue crack initiation from small defects under low stress ratios in SAE52100 bearing steel

Y. Hino, H. Matsunaga

Proceedings Volume 7522, Fourth International Conference on Experimental Mechanics; 752206 (2010) https://doi.org/10.1117/12.852684
Event: Fourth International Conference on Experimental Mechanics, 2009, Singapore, Singapore

Abstract

Axial-loading fatigue tests were carried out under low stress ratios, R = -∞ ~ -5.33, by use of a cylindrical specimen of SAE52100 bearing steel having drill holes of 50 ~ 200 μm in diameter. The maximum stresses, σ_max = 0 ~ 300 MPa were combined with the minimum stresses, σ_min of -1600 or -1800 MPa. Even at σ_max = 0, fatigue cracks were initiated at hole edges by cyclic compressive stress of σ_min = -1800 MPa, and the cracks finally became non-propagating. When σ_max was positive, fatigue cracks were initiated even at σ_min = -1600 MPa and they also became non-propagating. The length of non-propagating cracks increased with an increase in σ_max. Those phenomena were considered to be related to the tensile residual stress that was induced by the plastic deformation in the vicinity of hole edges. The relationship between the length of non-propagating crack and the residual stress field was investigated in terms of elastic-plastic finite element analysis.

Citation Download Citation

Y. Hino and H. Matsunaga "Fatigue crack initiation from small defects under low stress ratios in SAE52100 bearing steel", Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 752206 (14 April 2010); https://doi.org/10.1117/12.852684

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