| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
| Presentation Title |
A Crystal-plasticity Modeling Framework to Study Effect of Grain Size on Mechanical Response of Open-cell Aluminum Foam |
| Author(s) |
Dongfang Zhao, Kristoffer Matheson, Brian Phung, Michael Czabaj, Ashley Spear |
| On-Site Speaker (Planned) |
Dongfang Zhao |
| Abstract Scope |
Open-cell metallic foams are hierarchical structural materials that have applications as light-weight impact absorbers, noise insulators, and heat sinks, to name a few. We investigate the dependence of macro-scale mechanical response on grain structure of open-cell aluminum foam using a high-fidelity numerical framework with crystal-plasticity finite-element (CPFEM) modeling. The CPFEM framework is able to capture deformation mechanisms across multiple length scales of the foam by accounting for interactions among discrete grains of different crystallographic orientations. Grain-boundary strengthening and free-surface softening mechanisms have been implemented into the CPFEM framework to account for, respectively, the Hall-Petch effect and the effect of unconstrained slip-based deformation associated with high specific surface area inherent to open-cell foams. Eight microstructural instantiations (overlaid on a foam volume derived from X-ray tomography) are simulated to investigate the grain-size effect on local and global mechanical properties. The new insight and modeling framework enable grain-scale-based design of open-cell metallic foams. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |