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Fatigue Limit of Blunt-Notched Components

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The position and effective resistance of microstructural barriers and their relation to the fatigue strength of blunt-notched specimens are analysed and modelled for three low-carbon steel microstructures. A relationship for the notch size effect on the basis of the experimental evidence that the fatigue limit (both plain and notched) represents the threshold stress for the propagation of the nucleated microstructurally short cracks, was derived. The derived relationship characterizes the fatigue notch sensitivity by means of the parameter ktd defined as the stress concentration introduced by the notch at a distance d from the notch root surface equal to the distance between microstructural barriers, and was experimentally verified for two notch geometries in three microstructures: ferrite, ferrite–bainite and bainite–martensite.

Keywords: Blunt notches; Fatigue limit; Microstructural barriers; Notch sensitivity

Document Type: Research Article

Affiliations: 1: INTEMA, University of Mar del Plata, J.B. Justo 4302 (7600) Mar del Plata, Argentina 2: Material Science and Engineering, Nagoya University, Nagoya, 464–01, Japan

Publication date: 1998-12-01

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