Is there any shell element that i can use on rubber material to analyse harmonic behavior?

I have a rubber hose+ complex plastic hose model that i need to analyse on frequence responce analysis. I use tria6 shell element on rubber because its simple geometry and solid tetra20 model on plastic but i cant find a shell tria6 element on element library that use herrmann formulation. Marc automaticly assign thin shell element(element 46 ). I dont know if i can use thin shell element? Does anyone have a clue?

Thanks

0 Kiranraj Shetty over 5 years ago

Hi,

There is no shell element with Herrmann formulation. It is available for solid and 2D elements ( plane strain / axisymmetric ).

Herrmann elements are developed to handle incompressibility for plane strain, axisymmetric, and three-dimensional problems, so that the element mesh must be able to represent nondilatational (incompressible) deformation modes.

Regards,

Kiranraj Shetty
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0 cagri.kirt over 5 years ago

Thanks for fast answer Mr. Shetty

Can you give me a idea for model? what element type should i use on rubber? If i use 3d solid it takes lot of space and computational time.

Blue part is rubber,red part is plastic (it is modal and frequency responce analysis)
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0 Kiranraj Shetty over 5 years ago

Hi kirt,

Herrmann elements will have pressure dof in addition to the displacement dof. If mesh is good and, incompressibility is not an issue, you can use standard elements. Reduced integration elements will reduce computational cost, however make sure there are no hour glass modes.

Make use of parallel processing with multi cores and threads for optimum performance. As you are using Glue contact, contact should not be concern.

You can also try first order elements, and validate the stiffness, if it is good enough, you can use the same instead of second order elements.

Regards,

Kiran
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0 cagri.kirt over 5 years ago

Thank you for answers.
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