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Photoelasticity

Photoelasticity. Zhenhua Huang. Outline. Theroy of Photoelasticty Example 1: Stress Opticon Example 2: GFP 1000. Stress Opticon. Linear Polarizer Analyzer. Linear Polarizer. Natural Light. Circular Polarizer (¼ wave-length). Circular Polarizer. Sample. Observer.

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Photoelasticity

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  1. Photoelasticity Zhenhua Huang

  2. Outline • Theroy of Photoelasticty • Example 1: Stress Opticon • Example 2: GFP 1000

  3. Stress Opticon Linear Polarizer Analyzer Linear Polarizer Natural Light Circular Polarizer (¼ wave-length) Circular Polarizer Sample Observer

  4. Natural Light Ether Particles Vibration Light Vector (Amplitude, Direction, Phase Angle) Components

  5. Plane Polarizer • Polaroid: • Energy Loss: damper e • Nicol’s Prism: • Double Refraction Calcium o Canada Balsam

  6. Circular Polarizer

  7. Circular Polarizer Phase Angle: ? If When Another 1/4

  8. Colors Wave Length (different for colors) • Differentcolorlighthasdifferentphase angle, Rainbow appears. If no stress When stressed

  9. Review—Stress Opticon Colors

  10. GFP1000--Grey field polariscope GFP 1000 is a strain measurement system based on photoelasticity Aluminum Ring Wrench

  11. GFP1000 Theory:

  12. GFP1000 • Orientation of ellipse measures direction of e1 • Ellipticity measures magnitude

  13. GFP1000

  14. Coating

  15. Conclusion • Theory of Photoelasticity • Stress Opticon • GFP 1000

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