Near-threshold fatigue behaviors of small shear cracks in bearing steel

D. Koyanagi, N. Shomura, M. Endo, H. Matsunaga, S. Moriyama

研究成果: 書籍/レポート タイプへの寄稿会議への寄与


Failures of engineering components caused by rolling contact fatigue, such as flaking in bearings, are closely related to the initiation and growth of share-mode, i.e. Modes II and III, fatigue cracks. In order to evaluate quantitatively the fatigue strength of those components, it is necessary to elucidate the propagation and threshold behaviors of share-mode cracks, particularly for small cracks, on the basis of fracture mechanics. In this study, fatigue tests of fully-reversed cyclic torsion superposed upon static compression were carried out using SAE52100 bearing steel shafts into which semi-elliptical cracks smaller than 1 mm in size were initially introduced in the axial direction. Propagation and non-propagation of shear-mode fatigue cracks were controlled by changing the torsional stress amplitude. The threshold stress intensity factor (SIF) range for a share-mode crack was defined at the minimum stress required for crack propagation. Crack face interference was responsible for the reduction in crack driving force. An intrinsic value of threshold SIF range that does not include the effect of crack face interference was obtained to be approximately 13 MPa? m0.5.

ホスト出版物のタイトルFourth International Conference on Experimental Mechanics
出版ステータス出版済み - 2010
イベント4th International Conference on Experimental Mechanics - Singapore, シンガポール
継続期間: 11月 18 200911月 20 2009


名前Proceedings of SPIE - The International Society for Optical Engineering


その他4th International Conference on Experimental Mechanics

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学


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