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G. Fargione et alii, Frattura ed Integrità Strutturale, 26 (2013) 143-155; DOI: 10.3221/IGF-ESIS.26.14 153 Figure 17 : Thermal map of the specimen 5. Figure 18 : Thermal map of the specimen 6. Fatigue Limit  0 [MPa]  [°C x Cycles]  Specimen type 3 475 1.44E+05 Specimen type 4 460 8.70E+04 Specimen type 5 445 8.13E+04 Specimen type 6 440 1.85E+05 Table 8 : Results data of fatigue test. Using different colours, in Fig.19 it has been reported the Wöhler curves of each specimen (3, 4, 5, 6). Following as it is indicated in [4-5], the number of the breaking cycles N r for a specific load has been obtained as the ratio between the energy parameter Φ and the stabilization temperature (the mean value of the detected ones). Figure 19 : Wöhler curves of each specimen in according with RRM [4-5].