Pre-tension a flexible elastomer disc

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  • Last Post 13 June 2019
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daviderecchia posted this 12 June 2019

Hi All,

Here's another problem I'm facing now:
I have a disc made of soft flexible material that needs to be stretched over a tube opening.
Is it possible to apply a pre-tension load on the outer edge to simulate this?
The geometry I modeled should be the correct shape under tension.



(I'm thinking something like the bolt pretension condition but acting radially on the disc)

Thanks

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peteroznewman posted this 12 June 2019

To model the final state of this disk stretched over a tube, in geometry, construct the unstretched shape of the disk, and the tube.  The disk will have interference with the tube. In Mechanical, create a frictional contact between the OD of the tube and the ID of the disk. Use a Fixed Support on one end of the tube, some distance from the disk. The solver will resolve the contact over several substeps.

Under Analysis Settings, turn on Auto Time Stepping and try 10 Initial Substeps and turn on Large Deflection.  You may need other settings to get the problem to converge like using a hyperelastic material model and reduced integration on the elements.

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daviderecchia posted this 13 June 2019

In my case I actually wanted the disc OD to match the tube OD. I guess the hole in the middle was a bit confusing.

Anyway, I used a cylindrical coordinate system to apply a radial displacement of 1 mm to the outer edge.

(OD is offset inward 1 mm to account for this)

Axial and rotation components set to 0.

This way I can avoid setting up and solving complex contacts.

Thanks for your help.

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