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Structural Behavior of Kevlar/Spectra at Low Temperatures Jessica L. Robinson National High Magnetic Field Laboratory

Structural Behavior of Kevlar/Spectra at Low Temperatures Jessica L. Robinson National High Magnetic Field Laboratory. Kevlar. 5 Times Stronger Than Steel Lightweight Flexible and Comfortable Heat Resistant. Kevlar Can Be Found In…. Bulletproof Vest Airplanes Tennis Rackets

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Structural Behavior of Kevlar/Spectra at Low Temperatures Jessica L. Robinson National High Magnetic Field Laboratory

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  1. Structural Behavior of Kevlar/Spectra at Low TemperaturesJessica L. RobinsonNational High Magnetic Field Laboratory

  2. Kevlar • 5 Times Stronger Than Steel • Lightweight • Flexible and Comfortable • Heat Resistant

  3. Kevlar Can Be Found In… • Bulletproof Vest • Airplanes • Tennis Rackets • Extreme Sports Equipment

  4. The Problem With Kevlar Is That It…. • Decomposes When Exposed to Chlorine or under Alkaline conditions • Has Too High Of A Price • Is Incredibly Sensitive

  5. Now, The Experiment • Rotators With Kevlar String Elongate At Low Temperatures • Kevlar Fishing Lines Is Too Expensive To Purchase • Spectra String Is Structurally Similar To Kevlar and Can Be Bought • Do Rotators With Spectra String Elongate At Low Temperatures Like Those With Kevlar?

  6. Spectra Shield • Very Light • Ultra Thin • 10 Times Stronger Than Steel • Similar to Saran Wrap

  7. Spectra Shield Can Be Found In… • Military Protective Gear • Helmets • Fishing Lines • Cut-Resistant Gloves

  8. Materials • Spectra String • Dilatometer • Capacitor • Thermometer • Copper Wire • Capacitance Meter

  9. Methods and Procedures Objective: Build A Dilatometer • Attach Wires To Top and Lower Plate and Connect To Capacitance Meter with Ground • Attach a Thermometer onto the dilatometer • Design Experiments to ensure the Dilatometer is Most Accurate • Test in Liquid Helium • Record All Data

  10. Beneficial Formulas • ε0A/C =d • πD²/4 = A ε0 – Dielectric constant A – Area C - Capacitance

  11. Measuring The Distance To ensure there was no change in distance by rotating top plate: • Caliper was Used To Measure The Distance • Top Plate was Rotated Up To 180 ° Clockwise then Counter-Clockwise in 5Sets of 12 • Within Each Rotation of 60 °, The Distance Was Measured

  12. Now, Finding The Capacitance In Preparing to Measure Capacitance: • Capacitance Meter was used To Measure Capacitance • Wires From Dilatometer Inserted were Into Capacitance Meter • Capacitance was set to Measured in Pico Farad (pF)

  13. Pico-Farads • SI Units Of Capacitance is the Farad • Pico: Equal To One Trillionth,10-12 • Farad: Equal To That Of A Capacitor Carrying One Coulomb Of Charge When A Potential Difference Of One Volt is Applied.

  14. What Happened Was… • Capacitor Device Read “Off” • There Was No Steady Capacitance

  15. Solving The Problem • For A Steady Read Of The Capacitor, Dilatometer Had To Be Grounded • Grounding Is The Process Of Returning Electrical Circuit, Causing There To Be A Steady Pulse

  16. We Discovered That… • As Distance Increased, Capacitance Decreased • For some reason the capacitance either jumped up or down (still under investigation)

  17. Acknowledgements • NHMFL RET/REU: Shalton Evans and Megan Ballard • NHMFL Head Scientist: Mr. Eric Palm • HHMFL Coordinator: Mr. Carlos Villa • RIMS Program Director: Mr. Errol Wilson

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