Crack Size Dependency of Shear-Mode Fatigue Crack Threshold in Bearing Steel

Satoshi Muramoto; Hisao Matsunaga; Shigeaki Moriyama; Masahiro Endo

doi:10.4028/www.scientific.net/KEM.385-387.449

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 385-387Crack Size Dependency of Shear-Mode Fatigue Crack...

Crack Size Dependency of Shear-Mode Fatigue Crack Threshold in Bearing Steel

Abstract:

Semi-elliptical shear-mode fatigue cracks were promoted in the axial direction of round specimens of SAE52100 bearing steel by fully-reversed cyclic torsion tests under a static axial compressive stress. Non-propagating cracks smaller than 1 mm were obtained in two ways; (i) stress amplitude decreasing tests of notched specimens, or (ii) constant stress amplitude tests of smooth specimens. The threshold stress intensity factor ranges, (KIIth and (KIIIth, showed a crack size dependency.