Modelling Rubber - Mooney Rivlin

[DarrenPalmer]

Hi,


Does anybody have any experience using a Mooney Rivlin model for the elastic properties of rubber in Pro/Mechanica. I'm modelling the response of vibration isolators.


Are there any other models that are better/easier?


Cheers


Darren
Edited by: DarrenPalmer

 

[headrush]

I was under the impression that Mechanica couldn't model non-linear materials. Maybe I am wrong?

 

[ghgarzon]

COSMOS has built in utilities to model rubber.


Mechanica can't handle non-linear behavior of rubber.

 

[wpilgri]

Mechanica can't model nonlinear materials as headrush points out. For small strains with elastomer you could try picking the modulus at that strain and use poisson ratio of .499 but I wouldn't rely on the results too heavily. You really need a FEA package that allows the specification of a Mooney Rivlin or other material model. Cosmos is one of the packages that does it but Ansys, Nastran, Marc, Abaqus, etc are all other options as well....if they're available to you.

 

[shivdeep]

yes like wpilgri said right mechanica doesnot support nonlinear materials as they tend to have large deformations and results cannot be relied on. with the same modulus and poissions ratio and large deformations (for nonlinear),you can give it a try frankly speaking to my experience rubber is a funny thing to analyse and results cannot be relied on. moreover modulus for rubber being dependent on strain makes it complicated. to my suggession you can use ansys. for me i rely on tabulated data rather than design analysis for rubber.

 

[AHA-D]

I'm not promoting anything or anybody but we once visited a research center of Hutchinson near Paris, where you had something like 150 people working and they used a supercomputer to calculate deformation, fatigue, etc. Their software could for instance adapt to the deformed part when applying (new) boundary conditions. So you might be better of consulting a specialist/supplier for these type of questions.


My 0.02 eurocents

 

[DarrenPalmer]

Hi guys,



thanks vmuch for the replys. I had an inkling that ProM might struggle.
Since I'm stuck with ProM I will have to make sure my rubber doesn't
get deflected out of the region I have data for its stiffness. I was
going to see if I could use ProM to examine regions outside the known
area.



Cheers