| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Biological Materials Science
|
| Presentation Title |
Rate and Stress-state Dependent Calibration of FlexiForce Sensors for Injury Biomechanics Research |
| Author(s) |
Andrew D. Brown, Alexandra M Vest, Karin A Rafaels |
| On-Site Speaker (Planned) |
Andrew D. Brown |
| Abstract Scope |
The majority of head injuries are caused by dynamic events over a wide range of strain rates, from falls (100-101s-1) to military relevant ballistic and blast events (102-104s-1). Experimental injury biomechanics utilizing cadaveric and anthropomorphic devices are critical for developing human skull fracture criteria for predicting load transfer to the brain, informing computer models, and aiding in protective equipment design. FlexiForceŽ (Tekscan, Inc.) sensors show promise for injury biomechanics research applications, but calibration at high strain rates (>103s-1), forces (>1000N), and varied stress-states requires investigation. Custom Op-Amp circuitry has been implemented to increase the FlexiForceŽ A301 sensor working range from 445 to ~40,000N. Sensors were quasi-statically loaded for baseline voltage-force calibration under uniaxial compression and under varied shear-stresses using angled platen pairs. High-rate experiments for uniaxial compression and varied shear-stresses were conducted using Split-Hopkinson Pressure Bar technique. Rate and stress-state dependent calibration curves have been developed for FlexiForceŽ sensors. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |