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Development of a Shear Stress Sensor Using Cholesteric Crystals

This project focuses on creating a shear stress sensor that utilizes cholesteric crystals, originally discovered in cholesterol, to measure shear stress outside laboratory environments. The objectives include designing a testing apparatus, programming interface using LabView and MATLAB, and correlating load with voltage data from load cells. The project features finite element simulation of stress responses under various loading conditions and intends to validate the sensor's performance through experimental testing. Ongoing progress includes sample fabrication and interface readiness for comprehensive testing.

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Development of a Shear Stress Sensor Using Cholesteric Crystals

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  1. Shear Stress Sensor Using Cholesteric Crystals Group #3 Group Members Matthew Carmichael, FSU Tyler Elsey, FSU Luiz Paes, UNIFEI Graduate Assistant Matthew Worden Sponsors Dr. Dickinson , Eglin AFRL Dr. Oates, FAMU & FSU COE 2/20/2013 eng.fsu.edu/me/senior_design/2013/team3

  2. OVERVIEW • Project Scope and Objectives • Theory • Technical Approach • Final Design • Programming Needed • Schedule

  3. Need Statement & Project Scope • Need Statement • Need in the market for a shear stress sensor that can be used outside the lab • Project Scope • Create Testing Apparatus • Determine if cholesteric crystals are able to measure shear stress

  4. Cholesteric Crystals • Originally discovered in cholesterol • Helical Structure • Pitch varies with the boundary conditions • i.e. electricity or forces • Liquid Crystals made easily from 3 powders • Polymer form made through many time intensive processes

  5. Technical Approach • Assume no slip condition for liquid crystal testing • BluLoop Fiber Optic Light • Spectrometer: • 200-1100 nm • 2048 pixels • Linear Servo Motor: • 1 step = 1/64” • Load cell: • 10N

  6. Final Design

  7. Programming • LabView • Correlation between load and voltage with load cell • Load cell, spectrometer need to start at the same time – record information • MATLAB • Create method to review time resolved data • Filter spectrum from reference spectrum • Find equation that relates load to wavelength

  8. Labview

  9. Matlab

  10. Simulation – FEM (Finite Element Method) Pressure - Sine Load -0.5 sin ((4π/L)*x) Pa - top 0.5 sin ((4π/L)*x) Pa - bottom y x Pressure Error – Sigma YY Stress YY (Pa) Error (Pa) Y Coordinate (m) X Coordinate (m) X Coordinate (m)

  11. Simulation – FEM (Finite Element Method) Thin film - L=2000 (c) y x Pressure - Sine Load -0.5 sin ((4π/c)*x) Pa - top Stress YY (Pa) Y Coordinate (m) X Coordinate (m)

  12. Simulation – FEM (Finite Element Method) Shear - Cosine Load -0.5 cos((4π/L)*x) Pa - top 0.5 cos((4π/L)*x) Pa - bottom y x Pressure Error – Sigma XY Stress XY (Pa) Error (Pa) Y Coordinate (m) X Coordinate (m) X Coordinate (m)

  13. Simulation – FEM (Finite Element Method) Thin film - L=2000 (c) y x Shear - Cosine Load -0.5 cos ((4π/c)*x) Pa - top Stress XY (Pa) Y Coordinate (m) X Coordinate (m)

  14. Schedule

  15. Summary • -Shear stress device measurement was fabricated • -Labview and MATLAB interface is ready for experiments • -Testing samples have been made • -Next steps • Testing and analysis • Vary testing conditions and test polymer form of Cholesteric Crystals

  16. Questions/Comments

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