About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing Modeling, Simulation, and Machine Learning: Microstructure, Mechanics, and Process
|
| Presentation Title |
Combined Effects of Pore Diameter, Orientation, and Stress State on Fracture of LB-PBF SS316L |
| Author(s) |
Samuel Stanford, Erik Furton, Allison Beese |
| On-Site Speaker (Planned) |
Samuel Stanford |
| Abstract Scope |
This study investigated the effects of pore diameter, pore orientation, and stress state on the mechanical response and fracture behavior of high ductility metals. Leveraging AM’s unique capability to manufacture complex stress states and controlled internal pores, axisymmetric LB-PBF SS316L samples containing single, penny-shaped pores were manufactured with controlled diameters and orientations. Pore diameter, pore orientation, and stress state jointly governed the localization and heterogeneity of the strain and stress fields up to fracture, and subsequently the geometry of the fracture surface. These observations informed the extension of the stress state-dependent Hosford-Coulomb fracture model to include pore diameter and orientation dependent parameters, which refined the prediction of strain to fracture across the full range of pore diameters and orientations investigated. Collectively, these findings demonstrate a path toward integrating pore features and stress state into defect-tolerant design criteria for high ductility metals and qualification strategies for additively manufactured metallic components. |