Statistical Evaluation of Duplex S-N Characteristics with Two Competing Fracture Modes

Abstract:

Very high cycle fatigue property of a bearing steel in axial loading was studied. As a result, this steel exhibits the continuously descending S-N characteristics without the occurrence of traditional fatigue limit, and accompanying with two fracture modes including the surface induced fracture and the interior-induced fracture. Compared with its results in rotating bending, the duplex S-N characteristics in axial loading is not so distinct due to the difference of stress distribution. A new general statistical method based on the mixed Weibull distribution is proposed to evaluate the test data corresponding to these two facture modes. Consequently, the P-S-N curve of steel in axial loading can be better plotted by means of the new statistical method.

• Periodical: Applied Mechanics and Materials (Volume 378)
• Pages: 115-118
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.378.115
• Online since: August 2013
• Authors: Li Wei, Wang Ping, Tatsuo Sakai
• Keywords: Competing Fracture Mode, Mixed Weibull Distribution, P-S-N Curve, S-N Curve, Very High Cycle Fatigue (VHCF)

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