About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
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Additive Manufacturing Fatigue and Fracture: Towards Accurate Prediction
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Presentation Title |
Influence of Pore Defects on Fatigue Crack Growth Behavior of Additively Manufactured Ti-6Al-4V |
Author(s) |
Luca Loiodice, Krzysztof S. Stopka, Michael D. Sangid |
On-Site Speaker (Planned) |
Luca Loiodice |
Abstract Scope |
Despite efforts to minimize pore defects in additively manufactured (AM) materials, their complete elimination in components is impossible, making it crucial to understand their influence on material properties. This work characterizes the fatigue crack growth behavior of AM Ti-6Al-4V and how it is influenced by pore defects. A specimen of Ti-6Al-4V purposefully seeded with lack of fusion (LOF) defects, particularly detrimental to fatigue life, was subjected to computed tomography to obtain defect morphology data to inform this study. Crystal plasticity simulations were then performed on statistically equivalent virtual microstructures with an elasto-viscoplastic FFT model, analyzing several combinations of microstructures, defect morphologies and sizes, and defect-crack distances. Based on fatigue metrics, fatigue crack growth rates in the simulations were calculated, which have been used to qualitatively and quantitatively show how LOF defects affect the crack growth behavior of the material, especially the threshold stress intensity value. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Additive Manufacturing, Titanium |