About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Crack Interaction Effects in Porosity-Dominated Metals: A Framework for Fatigue-Life Prediction |
| Author(s) |
Aref Yadollahi, Seyedmostafa Nasrollahpourshirvani |
| On-Site Speaker (Planned) |
Aref Yadollahi |
| Abstract Scope |
Fatigue failure in porosity-dominated metallic materials is often driven by the interaction and coalescence of cracks originating from internal defects. In this study, novel fatigue specimens were fabricated from Inconel 718 using a metal additive manufacturing system, with intentionally seeded internal defects of controlled size, location, and spacing. These purpose-designed specimens enable a systematic investigation of how defect characteristics influence crack growth behavior and fatigue life. Results demonstrate that in both short-life and mid-life fatigue regimes, the coalescence of cracks from closely spaced defects can dominate failure, even when individual defects are not critical on their own. The findings highlight that defect spacing and proximity to the surface play a crucial role in accelerating failure mechanisms. This study establishes an experimental foundation for improving fatigue-life prediction in materials where multiple internal defects are inherent, offering new insight into crack interaction effects that are not captured in traditional models. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Modeling and Simulation, Additive Manufacturing |