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Urethane casted photoelastic samples
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Urethane casted photoelastic samples
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Photoelastic samples can be casted! And this is, by far, the most convenient way to get it: more versatile (shape, mechanical properties, color...), cheaper and without absolutely any residual stresses. Different photoelastic materials are castable. In this section we will talk about urethane but you can also look [here](https://git-xen.lmgc.univ-montp2.fr/PhotoElasticity/Main/wikis/molding-gel) to see how to make photoelastic samples from gels. Acrylics are another popular photoelastic material.
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Photoelastic samples can be casted! And this is, by far, the most convenient way to get it: more versatile (shape, mechanical properties, color...), cheaper and without absolutely any residual stresses. Different photoelastic materials are castable. In this section we will talk about urethane but you can also look [here](/molding-gel) to see how to make photoelastic samples from gels. Acrylics are another popular photoelastic material.
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This method is based on product you can find online at [Smooth On](https://www.smooth-on.com/). We emphasize here that the different authors of this wiki do not have any link of any sort with this company unless it is clearly specified in a paragraph.
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This method is based on product you can find online at [Smooth On](https://www.smooth-on.com/). We emphasize here that the different authors of this wiki do not have any link of any sort with this company unless it is clearly specified in a paragraph.
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| ... | @@ -22,7 +22,7 @@ Users have developed different techniques for fabrication of the backing mold. T |
... | @@ -22,7 +22,7 @@ Users have developed different techniques for fabrication of the backing mold. T |
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* Machined diabolo-shaped particle backing mold:
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* Machined diabolo-shaped particle backing mold:
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As in both of the examples pictured above, a mold that produces a silicone negative of uniform thickness and with regularly spaced particle wells will lead to the most reproducible and easy-to-produce castings. One innovation that has proven successful and improves the versatility of the backing mold is to machine a dish to precision flatness, then to drill an array of tapped holes into the dish. Any desired particle shape can then be machined or printed with a matching threaded post and screwed into the dish. Thus, a single backing mold can be used to create particles of any shape. Note that the [inverse analysis](https://git-xen.lmgc.univ-montp2.fr/PhotoElasticity/Main/wikis/inverse-analysis) technique to back out the vector forces on urethane particles are only well-developed for circular particles.
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As in both of the examples pictured above, a mold that produces a silicone negative of uniform thickness and with regularly spaced particle wells will lead to the most reproducible and easy-to-produce castings. One innovation that has proven successful and improves the versatility of the backing mold is to machine a dish to precision flatness, then to drill an array of tapped holes into the dish. Any desired particle shape can then be machined or printed with a matching threaded post and screwed into the dish. Thus, a single backing mold can be used to create particles of any shape. Note that the [inverse analysis](/inverse-analysis) technique to back out the vector forces on urethane particles are only well-developed for circular particles.
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* A modular dish with cylindrical posts of two sizes:
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* A modular dish with cylindrical posts of two sizes:
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| ... | @@ -233,7 +233,7 @@ Or if you trap a bubble: |
... | @@ -233,7 +233,7 @@ Or if you trap a bubble: |
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[<go back to home](https://git-xen.lmgc.univ-montp2.fr/PhotoElasticity/Main/wikis/home)
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[<go back to home](/home)
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