| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Algorithms Development in Materials Science and Engineering
|
| Presentation Title |
Thermally Activated Dislocation Ensembles: Maximum Dissipation and
Scaling Relations
|
| Author(s) |
David L. McDowell |
| On-Site Speaker (Planned) |
David L. McDowell |
| Abstract Scope |
A nonequilibrium statistical thermodynamics treatment of thermally activated dislocation ensembles motivates internal state variable (ISV) theory. Based on the concept of constrained local equilibrium and corresponding state relations, we define both configurational and thermal entropy changes associated with the energy landscape, linked to the probability of reaction. Considering individual grains or phases as subsystems, we define the degree-of-correlation of reactions in terms of the ratio of dissipation-weighted effective enthalpy to the maximum barrier enthalpy within each subsystem and for the ensemble comprised of all subsystems. The specific scaling relations of most conventional crystal plasticity internal state variable formulations inherently assume fully correlated reactions. Implications for scaling relations and self-organized criticality of dislocation ensembles are considered based on dislocation avalanching in the thermally activated regime. It is suggested that this framework can serve as a high dimensional physics-informed platform for applying machine learning methods to discern crystal plasticity model forms. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Computational Materials Science & Engineering, Mechanical Properties |