| About this Abstract |
| Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
|
| Symposium
|
Physical Modeling
|
| Presentation Title |
On the Applicability of Internal State Variable Plasticity Models for Metal-based Additive Manufacturing |
| Author(s) |
Matthew J. Dantin, Matthew Priddy |
| On-Site Speaker (Planned) |
Matthew J. Dantin |
| Abstract Scope |
The thermomechanical modeling of metal-based additive manufacturing (MBAM) often focuses on the prediction of thermally induced distortion and residual stresses. Mechanical models in literature range in fidelity from inherent strain, J2 plasticity, rate-dependent plasticity, to temperature- and rate-dependent internal state variable (ISV) models. The objective of this work is to discuss the advantages and disadvantages of using ISV models for the prediction of residual stresses and distortion in MBAM parts with a focus on the implementation and motivation of using ISV models. Furthermore, results using a J2 plasticity and an ISV model are compared for a thin wall Ti-6Al-4V directed energy deposition (DED) build. The ISV model used in this work is the Evolving Microstructural Model of Inelasticity, which is a rate- and temperature-dependent dislocation mechanics-based ISV plasticity model that has been used to predict residual stresses and distortion in DED parts along with weld solidification cracking. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |