About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
Presentation Title |
Informing Mechanical Model Development Using Lower-dimensional Descriptions of Microstructural Evolution |
Author(s) |
Darren C. Pagan, Gideon H Schmidt, Andy D Borum, Timothy J Long, Matthew P Miller, Armand J Beaudoin |
On-Site Speaker (Planned) |
Darren C. Pagan |
Abstract Scope |
The phenomenology of engineering alloy plastic deformation is usually expressed through the modeling of internal state variables representing the evolution of underlying microstructural features. However, determination of these state variables is often indirect, utilizing macroscopic mechanical data to isolate the effects of changing microstructure, rather than direct characterization of the microstructure in-situ. Here we present a novel method combining in-situ X-ray diffraction data and dimensionality reduction to inform the development of a state variable plasticity model. The method is applied to developing a model for pure nickel deformed in uniaxial tension in the small strain regime. First, we establish connections between state variables representing the evolution of mobile dislocations and the lower-dimensional representations of the data. Following connections being made, the lower-dimensional X-ray data are used to inform the inclusion of new terms in the evolution equations of the mobile and obstacle dislocation densities. |
Proceedings Inclusion? |
Planned: |