PSI - Issue 68

Ibrahim T. Teke et al. / Procedia Structural Integrity 68 (2025) 365–371 I. T. Teke & A. H. Ertas/ Structural Integrity Procedia 00 (2025) 000–000

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Fig. 5. Crack initiation, propagation and fracture on S-D-S-ER.

Fig. 6. Crack initiation, propagation and fracture on D-S-ER.

Overall, the S-D-S-ER method has demonstrated superiority in fatigue life, a finding that aligns with expectations. This outcome is supported by the work of Teke et al. (2024b), who conducted quasi-static three-point bending tests on both the S-D-S-ER and D-S-ER models. Their results revealed that the S-D-S-ER model exhibited greater stiffness within the linear region, further validating its enhanced performance. 4. Conclusions In conclusion, this study demonstrates the effectiveness of the S-D-S-ER method in significantly improving structural performance and fatigue resistance compared to the traditional D-S-ER approach. The key findings of the research are summarized as follows: • The S-D-S-ER method, which incorporates sub-modeling into the initial geometry design, led to notable enhancements in both structural durability and fatigue life. • Three-point bending tests showed that the S-D-S-ER model had a significantly longer fatigue life than the D-S-ER model, with crack initiation and propagation phases accounting for a large portion of this improvement.