Photoelasticity

Photoelasticity is an experimental method to determine the stress distribution in a material. The method is mostly used in cases where mathematical methods become quite cumbersome.  It gives stress bands of principle stresses for amorphous polymer materials.

Here is a video that describes how photo elasticity can be done with a camera and computer screen and a polarizing filter or polarizing sunglasses.

https://www.youtube.com/watch?v=8rtts66THp0

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