PSI - Issue 71

T. Vivekananda Swamy et al. / Procedia Structural Integrity 71 (2025) 111–117

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The images of these fractured specimens subjected to a maximum stress of 1000 MPa are presented in Fig. 5 (a), (b), and (c). Fig. 5 (d), (e), and (f) present the images of the fractured specimen subjected to a maximum stress of 900 MPa. The crack initiation, propagation, and final fracture regions can be seen in Fig. 4. Fig. 4 (a) and (d) indicate that the crack has initiated on the surface, eventually propagated along the propagation region and fractured. Secondary cracks and fatigue striations were observed near crack initiation and propagation regions as seen in Fig. 4 (b) and (e).

Fig. 4 Fatigue fractographs of RT Tests (a), (b) and (c) Maximum stress of 950 MPa. (d), (e) and (f) Maximum stress of 1000 MPa.