PSI - Issue 66

Ramdane Boukellif et al. / Procedia Structural Integrity 66 (2024) 55–70 Ramdane Boukellif et al. / Structural Integrity Procedia 00 (2025) 000 – 000

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Fig. 7. (a) Positions of the rolling element at the rolling increments 10 and 15; (b) curve during the rollover process at the initial crack.

Fig. 8. Crack path after branching (Boukellif et al. (2024)). For each crack extension, is determined for the respective crack front. The course of the equivalent SIFs for both cracks during crack growth are shown in Fig. 9. Both branched cracks show a steady decrease in with crack growth, with being higher for the left branched crack. Since the crack loading of both cracks approaches the threshold value ℎ , it is expected that both cracks will stop growing.

Fig. 9. course for the crack paths in Fig. 8: (a) for the crack left; (b) for the crack right (Boukellif et al. (2024)). The crack paths under rolling contact from the literature by Trollé et al. (2013) were qualitatively compared with our results, see Fig. 10. An unknown part with cracks was found and predicted, see Fig. 10(b). Crack paths for two cracks