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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

Photoelasticity

Zhenhua Huang

outline
Outline
  • Theroy of Photoelasticty
  • Example 1: Stress Opticon
  • Example 2: GFP 1000
stress opticon
Stress Opticon

Linear Polarizer Analyzer

Linear Polarizer

Natural Light

Circular Polarizer (¼ wave-length)

Circular Polarizer

Sample

Observer

natural light
Natural Light

Ether Particles Vibration

Light Vector (Amplitude, Direction, Phase Angle)

Components

plane polarizer
Plane Polarizer
  • Polaroid:
  • Energy Loss: damper

e

  • Nicol’s Prism:
  • Double Refraction

Calcium

o

Canada Balsam

circular polarizer7
Circular Polarizer

Phase Angle:

?

If

When

Another 1/4

colors
Colors

Wave Length (different for colors)

  • Differentcolorlighthasdifferentphase angle, Rainbow appears.

If no stress

When stressed

gfp 1000 grey field polariscope
GFP1000--Grey field polariscope

GFP 1000 is a strain measurement system based on photoelasticity

Aluminum Ring

Wrench

gfp 1000
GFP1000

Theory:

gfp 100012
GFP1000
  • Orientation of ellipse measures direction of e1
  • Ellipticity measures magnitude
conclusion
Conclusion
  • Theory of Photoelasticity
  • Stress Opticon
  • GFP 1000