| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Crystal Plasticity Fatigue Modeling of Additively Manufactured Materials With Various Pore Defect Morphology |
| Author(s) |
Krzysztof S. Stopka, Michael Sangid |
| On-Site Speaker (Planned) |
Krzysztof S. Stopka |
| Abstract Scope |
Additively manufactured (AM) materials are prone to porosity, which limits their widespread adoption in fatigue-limited applications. Experimental campaigns are vital in understanding the effects of porosity on fatigue resistance but are costly and time consuming. This work presents a crystal plasticity modeling framework to predict fatigue life debits in AM Ni-based superalloy 718 due to representative pore defects including keyhole, lack of fusion, and linearly aligned/planar pores. A strategy based on the macro-scale treatment of notches is proposed to regularize micromechanical field variables in large stress gradients in the presence of pores, or more generally, geometric discontinuities, of various sizes and morphology. The regularization volume is inversely proportional to the local pore radius of curvature and adequately smoothens micromechanical fields. The framework presented here can be used to augment experimental data and rapidly evaluate the detrimental effects of porosity on fatigue resistance in AM components. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Additive Manufacturing, Modeling and Simulation |