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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 stress and not really usable neither.
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So making a photoelastic simple 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 stress you want to apply. Second you have to make your sample without trapping any residual stress in it.
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Cutting samples out of a sheet
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The first method consist in cutting the sample out of a sheet of photoelastic material. You pick the right material and cut it using different methods listed in [this tutorial](https://git-xen.lmgc.univ-montp2.fr/PhotoElasticity/Main/wikis/cutting-sample)
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Molding urethane samples
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A second method consist in directly molding your sample in the shape you want. In this case you need first to make a mold of the sample shape you want. Then you pick a urethane with the Young Modulus corresponding with the load you want to apply and finally you can mole this liquid urethane and get your sample. The complete method and tips are given in [this tutorial](https://git-xen.lmgc.univ-montp2.fr/PhotoElasticity/Main/wikis/molding-urethane)
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Molding gel samples
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