wiki:sns:snspro:test_pressure_plastic_container []

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====== Testing a small pressure plastic container ======

===== Step 1: Create solid model=====
 
The first challenge is turning your surfaces into a single hollow solid.  To hollow out the interior, Rhino   requires you to connect the outside surface to the inside.  Do this with a small hole that will be negligible at analysis time (clipping plane turned on):

{{ :1.ifffdbif.png?300 |}}
Create a small cylindrical surface and trim away the pieces that aren't part of the solid's boundary.  Then use Rhino's CreateSolid command to stitch the surfaces into a single solid.

Run SnS on the resulting solid.

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===== Step 2: Specify material =====
If your material (e.g., polypropylene) is not one of the built in materials, so you'll have to enter it as a custom material.  Choose [Custom...] from the SnS dialog and enter the material properties for polypropylene that you can find online:
{{ :2.cdhcjecb.png?400 |}}
Click [<< Save] and [OK].
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===== Step 3: Apply restraint =====
In order to run the analysis, the solid must be restrained somewhere.  Click [Add] restraint and select the interior of the hole created earlier:
 {{ :3.ffhfiaaf.png?300 |}}

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===== Step 4: Applied the load =====
Manually convert 5 kg/cm^2 to 0.49 MPa.  Click [Add] load, select the 3 interior faces of the container and press Enter.  In the Boundary Load Creator dialog enter your 0.49 MPa pressure, and click [OK].
{{ :4.bdgbfjde.png?400 |}}
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===== Step 5: Run the analysis =====
Select desired resolutoin and click [GO!] to begin an analysis run.  Here are the displacement results with 100k elements:
{{ :5.dhhhaahg.png?500 |}}

We recommend making several analysis runs at higher and higher resolutions until the results don't change very much between runs.