About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Dynamic Behavior of Materials IX
|
Presentation Title |
High Strain-rate Nanoindentation Testing of Soft and Hard Model Materials |
Author(s) |
Benjamin Hackett, Christopher Walker, Wesley Higgins, Sudharshan Phani Pardhasaradhi, Warren Oliver, George Pharr |
On-Site Speaker (Planned) |
Benjamin Hackett |
Abstract Scope |
A new nanoindentation system designed specifically for testing at high strain rates up to 104 s-1 has been used to explore the strain rate dependence of the hardness of two model materials – soft aluminum and hard fused silica glass. The testing system is based on a very high stiffness specimen translation stage and gantry and a laser interferometer that provides sub-nanometer indenter tip displacement measurement resolution at data acquisition rates up to 10 MHz. The high data acquisition rate is crucial for determining dynamic effects on the load applied to the specimen. In general, the hardness of the materials is observed to increase in a measurable way at the higher strain rates. Three-dimensional imaging of the contact impressions in comparison to those obtained under quasi-static conditions reveals differences in contact geometry that may help to explain the origin of the enhanced hardness. |
Proceedings Inclusion? |
Planned: |