| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials Science for Global Development -- Health, Energy, and Environment: An SMD Symposium in Honor of Wole Soboyejo
|
| Presentation Title |
Discrete Defect Plasticity and Implications for Dissipation |
| Author(s) |
Alan Needleman |
| On-Site Speaker (Planned) |
Alan Needleman |
| Abstract Scope |
Inelastic deformation of solids is almost always associated with the evolution of discrete defects, e.g. dislocations and shear transformation zones (STZs). As this defect structure evolves, a portion of the mechanical working increases the stored elastic energy and a portion is dissipated. The partitioning between energy storage and dissipation plays a key role in various mechanical processes. Discrete defect plasticity formulations for this partitioning will be discussed with the dislocations modeled as line defects and STZs modeled as Eshelby inclusions. Within continuum mechanics, the second law of thermodynamics is generally expressed as requiring the dissipation rate to be non-negative for all points for all times. However, within statistical mechanics, this requirement emerges for large sizes and long times, but can be violated for small system for short times.. Implications of imposing restrictions on kinetic relations for a non-negative dissipation rate, and the possibility of violating them will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Mechanical Properties, Modeling and Simulation |