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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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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 cast the 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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gelatin:
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[lim *et al.*](https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.184501)
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[Kilcast *et al.*](http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2621.1984.tb12494.x/full)
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[Workamp and Dijksman](https://arxiv.org/abs/1709.10311)
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Not only urethane is a good photoelastic material convenient to form. Some gels can also be used.
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* Gelatine for example have been used in different labs by [lim *et al.*](https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.184501), [Kilcast *et al.*](http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2621.1984.tb12494.x/full) and [Workamp and Dijksman](https://arxiv.org/abs/1709.10311). It can be cross-linked for a better stability. The method is explained in [this tutorial]()
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agar:
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[Tamlinson and Taylor](https://www.spiedigitallibrary.org/journals/Optical-Engineering/volume-54/issue-8/081208/Photoelastic-materials-and-methods-for-tissue-biomechanics-applications/10.1117/1.OE.54.8.081208.short)
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other gel:
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