- Sections
- A. General Materials & Mathematics
- B. Statics
- C. Kinematics & Dynamics
- D. Rotational Mechanics
- E. Gravitation & Astronomy
- F. Fluid Mechanics
- G. Vibrations & Mechanical Waves
- H. Sound
- I. Thermodynamics
- J. Electrostatics & Magnetostatics
- K. Electromagnetic Principles
- L. Geometrical Optics
- M. Wave Optics
- N. Spectra & Color
- O. Vision
- P. Modern Physics
M8-14. Photoelasticity
Purpose
To demonstrate photoelasticity in plastic.
Equipment
Polarizers for overhead projector mount, plastic U, plastic sheet.
Images
Description
A polarizing sheet is mounted on a baffle which is positioned on the platform of the overhead projector, and a second polarizing sheet is connected to the lens of the projector. Rotating the upper polaroid shows how polaroids work. With the two polarizers crossed, a U-shaped piece of plastic is placed on the platform and squeezed at its ends to produce stress patterns with varied colors and intensities. A plastic sheet can be stretched to show similar patterns.
References
Stephen H. Burns and Myron A. Jeppesen, Photographing and Projecting Crystal Patterns in Convergent Polarized Light, AJP 28,774-776, (1960).
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See pagesm2. diffraction circular
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See pagesm3. interferometers
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See pagesm4. thin film interference
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See pagesm6. holograms
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See pagesm7. polarization & scattering
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See pagesm8. optical activity & birefringence
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See pagesm9. elliptical polarization
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See pagesm2. diffraction circular
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See pagesm3. interferometers
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See pagesm4. thin film interference
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See pagesm6. holograms
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See pagesm7. polarization & scattering
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See pagesm8. optical activity & birefringence
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See pagesm9. elliptical polarization