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Methods to make photoelastic samples
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Most of the transparent material around you have photoelastic properties. However for most of them you would need to load them so strongly to observe a photoelastic signal that you cannot really use it. Also most of the time no special attention have been paid while making them so that they are full of residual stresses and not really usable neither.
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Most of the transparent material around you have photoelastic properties. However for most of them you would need to load them so strongly to observe a photoelastic signal that you cannot really use it as photoelastic material. Another reason not to use any random transparent material to make a photoelastic sample is that most of the time no special attention have been paid while forming the material so that it is full of residual stresses and not really usable. As an example here is a pair of glasses:
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![IMG_0407](uploads/254a0670b5a0f6c15db9476fca0cfb7a/IMG_0407.JPG)
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So making a photoelastic sample is not simple. First you have to choose your material so that its photoelastic ability is enough to observe something significant in the range of stresses you want to apply. Second you have to make your sample without trapping any residual stress in it.
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