Issue 51

M. S. Bennouna et alii, Frattura ed Integrità Strutturale, 51 (2020) 254-266; DOI: 10.3221/IGF-ESIS.51.20 260 Figure 11 : Evolution of maximal equivalent plastic strain along the selected paths, for different numbers of cycles. Influence of the groove angle In this section, we will evaluate the influence of the dimensions of the groove of the tool on the equivalent plastic strain at the level of the different paths. For this reason, we selected three different values (30 °, 45 ° and 60 °) for the angle β as shown in Fig. 12. Figure 12 : Illustration of the different values of the angle β of the tool groove. The depth of the groove was fixed to 7mm. The results of the third cycle obtained for the three different selected trajectories (lower, middle and upper) are presented respectively in Figs. 13, 14 and 15. Case of a path of the upper face According to Fig. 13, it is the tool of 60 ° which ensures a higher equivalent plastic strain for the upper surface with a maximum value equal to 2.4, whereas, the weakest values are obtained at an angle of 30°. Case of a path of the middle face In this case, we note that the angle of 60 ° is the one which ensures the maximum of equivalent plastic strain with a value of 2.4 (Fig.14), whereas, the low values are obtained with the angle 30°.