1. Mechanics of Materials Lab
Lecture 7
Photoelasticity
Experimental Stress Analysis: Photoelasticity
Jiangyu Li
University of Washington
Jiangyu Li, University of Washington

2. Jiangyu Li, University of Washington
Isochromatic Fringe
Jiangyu Li, University of Washington

3. Jiangyu Li, University of Washington
Isochromatic Fringe
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4. Jiangyu Li, University of Washington
Stress-Optic Effect
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5. Jiangyu Li, University of Washington
Interference
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6. Jiangyu Li, University of Washington
Stress Concentration
Dense fringe indicates higher stress concentration
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7. Jiangyu Li, University of Washington
Linear Polarizer
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8. Jiangyu Li, University of Washington
Plane Polariscope
Extinction occurs under two consideration
(1) destruction interference;
(2) parallel principle axis of stress and polarizer
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9. Jiangyu Li, University of Washington
Isoclinic Fringe
Obtain by rotating polarizer and analyzer together
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10. Jiangyu Li, University of Washington
Quarter Wave Plate
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11. Circular Polariscope Provide equal amount of light along each of the
polarization directions at every point
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12. Jiangyu Li, University of Washington
Isochromatic Fringe
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13. Jiangyu Li, University of Washington
Four Point Bending
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14. Jiangyu Li, University of Washington
Assignment
Read note on phtoelasticity posted online
Jiangyu Li, University of Washington