About this Abstract |
| Meeting |
11th Conference on Trends in Welding Research + Additive Manufacturing (TWR+AM)
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| Symposium
|
11th Conference on Trends in Welding Research + Additive Manufacturing (TWR+AM)
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| Presentation Title |
Improving Fidelity of Residual Stress and Distortion Prediction for Welding and AM – Importance of Plasticity |
| Author(s) |
Wei Zhang, Xuesong Gao, Kaiwen Zhang, Nicholas Queiroz Avedissian |
| On-Site Speaker (Planned) |
Wei Zhang |
| Abstract Scope |
Residual stress and distortion are inherent to welding and AM due to the spatially non-uniform temperature distribution. Thermo-mechanical modeling has been valuable to understand their evolution during processing. Most literature models use rate-independent plasticity laws (e.g., von Mises yielding). The validity of those laws for various welding and AM processes is yet to be fully understood. Here, the importance of plasticity is evaluated for three welding heat inputs. The lowest heat input is printing of overhang structures using laser powder bed fusion. The rate-independent yielding criterion can capture how laser parameters affect distortion. The intermediate heat input is WAAM where in-processing annealing is found to be critical for the residual stress prediction. The highest heat input is pressureless sintering of parts printed by metal binder jetting AM. The gravity-driven distortion is predicted using viscoplastic constitutive law. These examples highlight the need for better understanding of metal plasticity at high temperatures. |
| Proceedings Inclusion? |
Undecided |