About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
2026 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-31: A Framework for Modeling Fatigue Crack Growth in LPBF Ti-6Al-4V Considering Microstructural Characteristics and Defect Structure |
| Author(s) |
Lucas Prata Ferreira, Nolan Strauss, Prajwal Kammardi Arunachala, Somnath Ghosh |
| On-Site Speaker (Planned) |
Lucas Prata Ferreira |
| Abstract Scope |
Most of a component’s fatigue life is contained within the short crack growth regime. Because of that, this work studies how microstructural descriptors and defects affect microcrack propagation and arrest in LPBF Ti-6Al-4V. A novel machine learning-enhanced effective CPFE model was used to dramatically speed up the simulation of material behavior considering the complex Widmanstätten microstructure. Defects were considered in two ways: small voids were described as a porosity field parametrically embedded in the effective CPFEM formulation to handle softening effects, while larger defects were explicitly included in the polycrystalline Statistically Equivalent Representative Volume Elements (SERVEs) to act as stress concentrators. Crack propagation behavior in defective and undefective SERVEs was studied using a phase field formulation. The competition between microstructure and defects in guiding and arresting cracks was effectively observed with the proposed framework, thus narrowing the gap between modeling approaches for microscale short crack and macroscale long crack growth. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Modeling and Simulation, Mechanical Properties, Titanium |