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Influence of Graphite Nodules Geometrical Features on Fatigue Life of High-Strength Nodular Cast Iron

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Abstract

This paper is concerned with the evaluation of different fatigue strength theories to predict the fatigue life of high-strength nodular cast iron. There have been some studies on the effects of the shape and size of graphite nodules, and of microstructure, on the fatigue strength of nodular cast iron. However, there is not a consensus on how to correlate the fatigue limit with material intrinsic properties or with external features such as considering graphite nodules as defects. Some researchers found good correlations between fatigue strength, σw0, and the geometrical aspects of the graphite nodules, considering it as internal material defects. It will be shown in this study that geometrical features such as shape, size, and relative position seem to be adequate to be included in those predictions. In this article, a high-strength cast iron, with rupture strength of about 1300 MPa and Young’s modulus of about 160 GPa, has been used. Correlations both with intrinsic properties as well as with other geometrical effects have been made. A comparison of different theories has also been carried out.

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Acknowledgments

This work was supported by a BDE—Bolsa de Doutoramento em Empresa (PhD Grant between FCT “Fundação para a Ciência e a Tecnologia” and Mahle Company) with the reference SFRH/BDE/15556/2005.

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Authors and Affiliations

  1. MAHLE – Engine Components S.A., Murtede, Portugal

    Nuno Costa & Nuno Machado

  2. Department of Mechanical Engineering, Minho University, Campus de Azurém, Guimaraes, 4800-058, Portugal

    Nuno Costa & Filipe Samuel Silva

Authors
  1. Nuno Costa
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  2. Nuno Machado
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  3. Filipe Samuel Silva
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Correspondence to Nuno Costa.

Additional information

This article was presented at Materials Science & Technology 2007, Automotive and Ground Vehicles symposium held September 16–20, 2007, in Detroit, MI.

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Costa, N., Machado, N. & Silva, F. Influence of Graphite Nodules Geometrical Features on Fatigue Life of High-Strength Nodular Cast Iron. J. of Materi Eng and Perform 17, 352–362 (2008). https://doi.org/10.1007/s11665-008-9231-7

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  • DOI: https://doi.org/10.1007/s11665-008-9231-7

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