About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Dynamic Behavior of Materials IX
|
Presentation Title |
G-4: An Improved Method for High Strain Rate Nanoindentation Testing Using Piezoelectric Load Cell Measurements |
Author(s) |
Christopher Walker, Benjamin Hackett, Sudharshan Phani Pardhasaradhi, Warren Oliver, George M Pharr |
On-Site Speaker (Planned) |
Christopher Walker |
Abstract Scope |
Traditional nanoindentation relies on careful calibration of an electromagnetic actuator to determine the load applied to the indenter tip and assumes no dynamic forces are applied to the sample. This assumption does not hold for high strain rate nanoindentation, where the applied force is dominated by dynamic contributions from high velocities and accelerations during the test. Time derivatives of the measured displacement can be used to calculate the dynamic contributions but drastically amplify noise in the load. Here, an investigation was conducted to determine if a piezoelectric load cell can be used to improve load on sample accuracy in a high strain rate nanoindentation system. It was found that the measured piezoelectric load mitigates noise issues but introduces new time constants that have important implications for the load-depth curves with physical relevance for material characterization. In turn, reduced noise in the load measurements can lead to more precise hardness measurements. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Other, |