About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Additive Manufacturing: Length-Scale Phenomena in Mechanical Response
|
Presentation Title |
Modeling of Microscale Internal Stresses in Additively Manufactured Materials |
Author(s) |
Kunqing Ding, Yin Zhang, Ting Zhu |
On-Site Speaker (Planned) |
Kunqing Ding |
Abstract Scope |
Additively manufactured materials usually exhibit high yield strength due to printing-induced sub-micron dislocation cell structures. These as-printed dislocation cells and structures hinder dislocation glide during plastic deformation. Here we develop models of microscale internal stresses by focusing on their back stress components. Four sources of back stresses are considered, including the printing and deformation-induced back stresses associated with as-printed dislocation cells, the deformation-induced back stresses associated with grain boundaries as well as the deformation-induced back stresses associated with precipitates. A dislocation pile-up model is adopted to evaluate the deformation-induced back stresses associated with as-printed dislocation cells. The extracted back stress relation from the pile-up model is incorporated into a crystal plasticity model. The crystal plasticity finite element simulation results agree with the experimentally measured macroscopic back stress and tension-compression asymmetry. Our results provide an in-depth understanding of the origins and evolution of microscale internal stresses in AM metallic materials. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Modeling and Simulation, Mechanical Properties |