| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing Modeling, Simulation, and Machine Learning: Microstructure, Mechanics, and Process
|
| Presentation Title |
Sample Size Effect of Flaws on Fracture Behavior of Ti-6Al-4V by Laser Powder Bed Fusion: Experiments and Modeling |
| Author(s) |
Erik T. Furton, Allison M. Beese |
| On-Site Speaker (Planned) |
Erik T. Furton |
| Abstract Scope |
To safely implement additively manufactured components for load-bearing applications, the relation between the size of a pore, both in terms of absolute size and relative to the size of the part, and the fracture behavior must be understood. In this study, the effect flaw size on the fracture behavior of Ti-6Al-4V fabricated by laser powder bed fusion was investigated by intentionally embedding pores into mechanical test specimens, where both pore and sample size were varied. A fracture model, based on the failure assessment diagram calculation of the J-integral in a finite axisymmetric body, and the secondary Q parameter describing loss of constraint in the vicinity of the crack under uniaxial tension, was developed. 90% of the experimental variability of failure strain was captured with the model. For a given sample diameter, the fracture model identified the critical pore size for both engineering stress- and strain-based design criteria. |