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M. Grasso et alii, Frattura ed Integrità Strutturale, 26 (2013) 69-79; DOI: 10.3221/IGF-ESIS.26.08 79 In the end, the model parameters have been identified and some interesting correlations between them have been found. These latter, by further analysis and validation on the basis of a wider experimentation results could be usefully adopted to build up a new phenomenological model for fatigue crack growth that is robust, adaptable and valid in the full crack propagation field. R EFERENCES [1] ASTM E 647: Standard test method for measurement of fatigue crack growth rates, USA, (2011). [2] Mukherjee, B., A note on the analysis of fatigue crack growth data, Int. J. of Fracture, 8(4) (1972) 449-452. [3] Smith, R. A., The determination of fatigue crack growth rate from experimental data, Int. J. of Fracture, 9 (1973) 352- 355. [4] Davies, K.B., Feddersen, Evaluation of fatigue-crack growth rates by polynomial curve fitting, Int. J. of Fracture, 9 (1973) 116-18. [5] Polak, J., Knesl, Z, On the fatigue crack growth rate evaluation from experimental data, Int. J. of Fracture, 11, (1975), 693-96. [6] De Iorio, A., Ianniello, D., Penta, F., Santoro, E., In: 8 th ECCM, Naples, Italy, (1998). [7] Zheng, J., Powell, B. E., A method to reduce the scatter in fatigue crack growth rate data, Fatigue Fract. Engng Mater. Struct., 20(9) (1997) 1341-1350. [8] Mohanty, J.R., Verma, B.B., Ray, P.K., Determination of fatigue crack growth rate from experimental data: a new approach", Int. J. Microstructure and Materials Properties, 5(1) (2010) 79-87. [9] De Iorio, A., Grasso, M., Penta, F., Pucillo, G.P., A three-parameter model for fatigue crack growth data analysis, Frattura ed Integrità Strutturale, 21 (2012) 21-29. [10] Ghonem, H. Dore, S., Experimental study of the constant-probability crack growth curves under constant amplitude loading, Engineering Fracture Mechanics, 17(I) (1987) 1-15. [11] Virkler, D. A., Hillberry, B. M., Goel, P. K., The Statistical Nature of Fatigue Crack Propagation, Transactions of the ASME, 101 (1979) 148-153. [12] Wu, W.F., Ni, C.C., Statistical aspects of some fatigue crack growth data, Engineering Fracture Mechanics, 74 (2007) 2952–2963. [13] De Iorio, A., Grasso, M. Penta, F., Pucillo, G.P., About the certification of railway rails, Frattura ed Integrità Strutturale, 26 (2014) 57 – 68. [14] Kendall, M. G., Rank correlation methods, (2nd ed.). New York, Hafner, (1955).