A practical method for fatigue limit prediction in ductile cast irons
Corresponding Author
Masahiro Endo
Department of Mechanical Engineering, Fukuoka University, Fukuoka, Japan
Institute of Materials Science and Technology, Fukuoka University, Fukuoka, Japan
Correspondence
Masahiro Endo, Department of Mechanical Engineering, Fukuoka University, Fukuoka, Japan.
Email: [email protected]
Search for more papers by this authorTakashi Matsuo
Department of Mechanical Engineering, Fukuoka University, Fukuoka, Japan
Institute of Materials Science and Technology, Fukuoka University, Fukuoka, Japan
Search for more papers by this authorCorresponding Author
Masahiro Endo
Department of Mechanical Engineering, Fukuoka University, Fukuoka, Japan
Institute of Materials Science and Technology, Fukuoka University, Fukuoka, Japan
Correspondence
Masahiro Endo, Department of Mechanical Engineering, Fukuoka University, Fukuoka, Japan.
Email: [email protected]
Search for more papers by this authorTakashi Matsuo
Department of Mechanical Engineering, Fukuoka University, Fukuoka, Japan
Institute of Materials Science and Technology, Fukuoka University, Fukuoka, Japan
Search for more papers by this authorAbstract
A simple, reasonably accurate method was proposed for fatigue limit prediction in ductile cast irons (DCIs) containing small defects, employing an easy-to-use prediction equation. A technique was also presented for the estimation of the statistical effects of complex structural discontinuities, as characterized by graphite and casting defects. The validity of these approaches was confirmed by the experimental results obtained via rotating-bending fatigue tests on six DCIs, with varying distributions of graphite nodule size and different matrix structures.
REFERENCES
- 1 JR Davis (Ed). ASM Specialty Handbook: Cast Irons. Materials Park, OH: ASM International; 1996.
- 2Östensson B. Influence of microshrinkage cavities on the endurance limit of nodular cast iron. J Iron Steel Inst Sept. 1973; 211: 628-631.
- 3Nisitani H, Murakami Y. Role of nodules on bending and torsional fatigue of nodular cast iron. Trans Jpn Soc Mech Eng. 1973; 25: 543-546.
- 4Sofue M. On the fatigue strength of spheroidal graphite cast iron in relation to the distribution of inclusions. J Jpn Foundrymen's Soc. 1976; 48: 29-35.
- 5Clement P, Angeli JP, Pineau A. Short crack behaviour in nodular cast iron. Fatigue Eng Mater Struct. 1984; 7(4): 251-265.
- 6Endo M. Fatigue strength prediction of nodular cast irons containing small defects. In: U Muralidharan, ed. Impact of Improved Materials Quality on Properties, Product Performance, and Design. ASME MD-vol. 28. New York: ASME; 1991: 125-137.
- 7Endo M, Wang X-B. Effects of graphite and artificial small defect on the fatigue strength of current ductile cast irons. J Soc Mater Sci Jpn. 1994; 43(493): 1245-1250.
- 8Nadot Y, Mendez J, Ranganathan N. Influence of casting defects on the fatigue limit of nodular cast iron. Int J Fatigue. 2004; 26(3): 311-319.
- 9Yamabe J, Kobayashi M. Influence of casting surface on fatigue strength of ductile cast iron. Fatigue Fract Eng Mater Struct. 2006; 29(6): 403-415.
- 10Yamabe J, Kobayashi M. Effect of hardness and stress ratio on threshold stress intensity factor ranges for small cracks and long cracks in spheroidal cast irons. J Solid Mech Mater Eng. 2007; 1(5): 667-678.
10.1299/jmmp.1.667 Google Scholar
- 11Costa N, Machahado N, Silva FS. Influence of graphite nodules on fatigue limit of nodular cast iron. Ciência Technol Mater. 2008; 20: 120-127.
- 12Costa N, Machahado N, Silva FS. A new method for prediction of nodular cast iron fatigue limit. Int J Fatigue. 2009; 32: 988-995.
- 13Endo M, Yanase K. Effects of small defects, matrix structures and loading conditions on the fatigue strength of ductile cast irons. Theor Appl Fract Mech. 2014; 69: 34-43.
- 14Bergström J, Burman C, Svensson J, et al. Very high cycle fatigue of two ductile iron grades. Steel Res Int. 2015; 87: 614-621.
- 15Shiraki N, Fujimoto R, Tomizawa M, Hara T, Hirose T. Possibility on estimation of fatigue limit using non-distractive testing method in spheroidal graphite cast iron. Proceedings of the 72nd World Foundry Congress, Nagoya, Japan; 2016, O-15.
- 16Foglio E, Lusuardi D, Pola A, La Vecchia GM, Gelfi M. Fatigue design of heavy section ductile irons: influence of chunky graphite. Mater Des. 2016; 111: 353-361.
- 17Borsato T, Ferro P, Berto F, Carollo C. Fatigue strength improvement of heavy-section pearlitic ductile iron castings by in-mould inoculation treatment. Int J Fatigue. 2017; 102: 211-227.
- 18Shirani M, Härkegård G. Fatigue life distribution and size effect in ductile cast iron for wind turbine components. Eng Fail Anal. 2011; 18(1): 12-24.
- 19Cova M, Nanni M, Tovo R. Geometrical size effect in high cycle fatigue strength of heavy-walled ductile cast iron GJS400: weakest link vs defect-based approach. Procedia Eng. 2014; 74: 101-104.
- 20Murakami Y. Metal fatigue: effects of small defects and nonmetallic inclusions. Oxford: Elsevier; 2002.
- 21Schönbauer BM, Yanase K, Endo M. The influence of various types of small defects on the fatigue limit of precipitation-hardened 17-4PH stainless steel. Theor Appl Fract Mech. 2017; 87: 35-49.
- 22Deguchi T, Kim HJ, Ikeda T, Yanase K. Influence of mean stress on fatigue strength of ferritic-pearlite ductile cast iron with small defects. J Phys Conf Ser. 2017; 843:012049.
10.1088/1742-6596/843/1/012049 Google Scholar
- 23Ikeda T, Umetani T, Kai N, Endo M, Matuo T, Ogi K. Influence of internal shrinkage cavities on high cycle fatigue strength of spheroidal graphite cast iron. J Jpn Foundry Eng Soc. 2017; 89: 570-576.
- 24 ASM Handbook, Vol. 8: Mechanical Testing and Evaluation. Materials Park, Ohio: ASM International; 2000: 282.
