Issue 43

P. Corigliano et alii, Frattura ed Integrità Strutturale, 43 (2018) 171-181; DOI: 10.3221/IGF-ESIS.43.13 178 Figure 11: Thermal images during the test at 20 kN. Figure 12: Thermal images during the test at 30 kN. Figure 13:  -N curve during the test at P max = 20 kN. The Thermographic method, proposed in [21] , was also applied, which allowed obtaining a further estimate of the fatigue strength of the Ti-6Al-4V alloy. The stabilized values (stage II) of the temperature increment ΔT AS , above the initial temperature, detected by IR thermography during fatigue testing conducted at f = 5 Hz, were plotted as a function of the