| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing Modeling, Simulation, and Machine Learning: Microstructure, Mechanics, and Process
|
| Presentation Title |
Effect of Size, Location, and Aspect Ratio of Pores on Ductility of PBF-LB Ti-6Al-4V: Experiments and Simulations |
| Author(s) |
Erik T. Furton, Selda Nayir, Allison Beese |
| On-Site Speaker (Planned) |
Erik T. Furton |
| Abstract Scope |
The effect of internal flaws on the fracture behavior of Ti-6Al-4V fabricated by laser powder bed fusion additive manufacturing was investigated. Notched tension samples were used to probe large stress triaxialities, where pores are most critical. Each sample was designed to contain a single pore (between 0.12% and 0.25% of the cross-sectional area), and the effects of pore size, location, and aspect ratio on ductility were systematically studied. The pore size was found to be most critical, followed by pore location, while the effect of aspect ratio on failure strain was negligible compared to experimental variability. To model the severity of the pore, a damage-based ductile fracture model was calibrated, and crack tip modeling was performed to calculate the J-integral at fracture. These analyses showed that damage accumulation was initially greatest for near-surface pores, but with increased deformation, centrally-located pores became more critical. |