About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
General Poster Session
|
Presentation Title |
K-141: Investigation of Strain Rate Sensitivity with Novel High Strain Rate Nanoindentation |
Author(s) |
Christopher Walker, George Pharr |
On-Site Speaker (Planned) |
Christopher Walker |
Abstract Scope |
Efficient studies of strain-rate dependency can be conducted with nanoindentation but are limited by data acquisition rates (DAQs) and electronic time constants. At high strain rates, DAQs under 1 kHz provide few usable data points for analysis. Current loading time constants prevent ultra-high strain rate testing as the applied load is difficult to determine when moving faster than the time constant. Pairing electromagnetic forces with laser-guided displacement readings will be used to improve the possible data acquisition rate from 100 kHz to as high as 5 MHz. Using the laser’s control system to bypass the slow USB control process for the electromagnetic coil will lower the associated time constant to near-instantaneous application. Ultra-high strain rate sensitivities will be measured in various materials including single crystals, multi-phase materials, and non-equilibrium vapor-deposited thin films. Results of these experiments will provide further experimental input for simulations and models for strain rate sensitivity. |
Proceedings Inclusion? |
Undecided |