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Hyperelastic Shell

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roger_coxNUKZV
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Hyperelastic Shell

Nonlinear Static Deformation Analysis

I'm modelling a thin part made from a hyperelastic material.

With Tet elements, it crashes when I reduce the element size or increase the displacement, so I believe that it should be modelled in shell elements.

shell.png

But, with shell elements, as shown in the figure, it only runs if I change the material to Isotropic. With the Superelastic material I get:

FATAL ERROR T2027: NON-COMPATIBLE MATERIAL

I'm looking at a high strain on a material that gets a lot stiffer at high strains, so an Isotropic material is going to give unrealistic results. Any suggestions please?

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John_Holtz
in reply to: roger_coxNUKZV

Hi @roger_coxNUKZV . Welcome to the Inventor Nastran forum.

 

The thickness of shell elements does not change in a nonlinear analysis. (This is probably why the hyperelastic material model is not supported.) 

 

Since the part is not that thin (10 mm thick for a 60 mm "diameter" tube) and a hyperelastic material is required, you should use a solid model for the analysis.

 

John



John Holtz, P.E.

Global Product Support
Autodesk, Inc.


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