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V. Oborin et alii, Frattura ed Integrità Strutturale, 34 (2015) 422-426; DOI: 10.3221/IGF-ESIS.34.47 426 crack growth and can be used for the identification of phenomenological parameters (power index) providing self-similar law for the crack path. Sample number Elongation (mm) Striker velocity (m/s)  , MPa   , cycles Zone number l sc , mkm L pz , mkm H 1 0.89 28.4 130 7.33·10 +6 2 1.4 20.6 0.57 2 1.77 40.3 120 7.82·10 +8 2 3 0.5 0.8 10.9 21.4 0.63 0.62 3 1.27 32.1 120 5.72·10 +7 2 1.0 18.2 0.60 4 2.21 40.3 105 5.83·10 +6 2 1.0 14.2 0.46 Table 1 : The values of the Hurst exponent H and scales L pz and l sc at various levels of fatigue longevity. A CKNOWLEDGEMENT his study was supported by the Russian Science Foundation, project № 14-19-01173. R EFERENCES [1] Peters, J. O., Influence of foreign object damage on crack initiation and early crack growth during high-cycle fatigue of [2] Ti-6Al-4V, Eng. Fract. Mech., 67 (2000) 193-207. [3] Paris, P., Lados, D., Tad, H., Reflections on identifying the real  K effective in the threshold region and beyond, Eng. [4] Fract. Mech., 75 (2008) 299–3052. [5] Barenblatt, G.I., Scaling phenomena in fatigue and fracture, Int. J. of Fracture, 138 (2006) 19–35. [6] Ritchie, R.O., Incomplete self-similarity and fatigue-crack growth, Int. J. of Fracture, 132 (2005) 197–203. [7] Bouchaud, E., Scaling properties of cracks, J. Phys. Condens. Matter, 9 (1997) 4319– 4344. [8] Froustey, C., Naimark, O., Bannikov, M., Oborin, V., Microstructure scaling properties and fatigue resistance of [9] prestrained aluminium alloys (part 1: Al-Cu alloy), European Journal of Mechanics A/Solids, 29 (2010) 1008–1014 . T