Round V-notched specimens were machined from the same cylindrical bars already mentioned. In order to analyze the notch tip radius effect, five different notch radii were made, namely 0.1,0.3, 0.5, 1.0 and 2.0 mm. The specimens’ geometry is sketched inFig. 3. In order to have a control on the experimental scatter of the results, five specimens of each notch tip geometry were made.All in all, a total of 25 V-notched specimens were tested.