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Modeling Latex membrane


alberto69
Posts: 2
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(@alberto69)
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Joined: 13 years ago

Hi

Im new to this forum and also to ansys software.

Im stuck with a problem to find the deflection in a circular latex(rubber) membrane, fixed at the circumference, when applied with uniform pressure.

I used the element type SOLID45 to model the membrane.

radius=0.075m

thickness=0.0003m

and the pressure 1000N.m-2

Material property i used was Structural->Linear->Elastic->Isotropic-> EX=7e5, PRXY=0.49

but the deflection im getting is too small around 0.3mm! which i think is wrong.

i feel the problem is in the element type i used to model the membrane.

Please help.

Thank you.

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Jorgen
Posts: 3920
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Joined: 2 years ago

Since the radius is so much larger than the thickness, you might want to use shell or membrane elements instead of solid elements.

Also you might want to try to increase the mesh density.

- Jorgen

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alberto69
Posts: 2
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(@alberto69)
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Joined: 13 years ago

thank you for the suggestion.

i tried shell/membrane but then when meshing they give me an error saying volume mesh command(VMESH) cannot be used.

i used SOLID95 element and got a result somewhat close to the analytical value. there is some 6mm difference in the answer.

will finer meshing give a better result?

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Jorgen
Posts: 3920
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Yes, finer mesh might help.

- Jorgen

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