About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanics at the Extremes: Bridging Length-Scales From Nanoscale to Bulk
|
| Presentation Title |
Characterization of Elastodynamic Pulses from Dislocation Nucleation during Shock of Aluminum |
| Author(s) |
Andre Archer, Cameron Frampton, Douglas Spearot |
| On-Site Speaker (Planned) |
Andre Archer |
| Abstract Scope |
Establishing a detailed description of shock induced plasticity is critical for the development of materials used in ballistics, spacecraft, and nuclear applications. Molecular dynamics (MD) simulation is an effective method to model shock loading in metals where features related to plasticity can be captured on the nanoscale at femtosecond resolution. The objective of this work is to elucidate a temporal description of dislocation nucleation during shock in aluminum. Measurement of instantaneous plastic wave velocity during shock results in periodic spikes of velocity, indicative of dislocation nucleation. Profiles of stress of shocked aluminum reveal pulses emitted from the plastic wave front. This work provides evidence that these pulses are elastodynamic signatures of dislocation nucleation events originating at the spikes in plastic wave velocity. These details provide much needed information to properly model shock induced plasticity at higher length scale simulation methods, such as discrete dislocation dynamics. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Other, Modeling and Simulation |