About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Behavior at the Nanoscale VII
|
Presentation Title |
Nanoscale Plasticity by Means of Stochastic Discrete Slip Events |
Author(s) |
Carlos J. Ruestes, Javier Segurado |
On-Site Speaker (Planned) |
Carlos J. Ruestes |
Abstract Scope |
Nanoporous metals, nanopillars and nanowires offer outstanding mechanical properties inherited from their base material and a complex interplay of timescales and lengthscales. Plasticity is often dominated by discrete slip events of stochastic nature, involving dislocation dynamics and surface nucleation. Such aspects pose challenges to the interpretation of experiments and the simulation of such materials under mechanical loading. We present a multiscale computational framework in which a kMC-based stochastic approach considering the slip of a collection of individual planes is implemented on an FFT-based homogenization software by introducing each slip event as a shear eigenstrain field. The probability of a slip event is linked with the resolved stress on the plane to account for surface nucleation and thermally-activated screw dislocation motion. The implementation is used first to predict the behavior of tungsten pillars and then extended to tungsten nanofoams. The macroscopic stress-strain curves and deformation patterns agree with experimental results. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Computational Materials Science & Engineering, Mechanical Properties |