Ogden equation data for silicone rubber?

[jtomasik]

I'm trying to perform a large deflection, non-linear analysis of a rubber part. The part will be made from silicone rubber. I'm told the ogden equations are applicable for this exercise. Unfortunately, I am unable to find the numbers to plug into the equation. I have contacted a couple of materials suppliers, but they have been unable to assist me. Does anyone have these numbers so I can at least get a rough idea what's going on? Natural rubber would even be ok.

 

[prost]

I don't have any data for this; but the first things I would do is, if this is commercial FEA software, check the tutorial or example problems; this might give you some idea of typical values. Again, if this is commercial FEA software, there might be a users manual or a theory manual that discusses typical Ogden equation values.

 

[jtomasik]

I've checked the software's tutorials and manuals. I've contacted the software's technical support. The only place I've found the information is in a couple of standard text books that had Ogden's equation and a couple of numbers. The problem is that the examples only have 3 alpha and mu numbers, whereas the equations ask for 4. I'm running the problem tonight (the machine's at work), and I'm hoping for a result. But, the software tech support people could not tell me if the missing number would cause a problem.

There has got to be some place where somebody has used Ogden's equation to do large displacement of a rubber body.

 

[prost]

can you get this paper?

http://cat.inist.fr/?aModele=afficheN&cpsidt=18088689

If you could switch to 3 parameters for alpha and mu, you might want to take a look at this book excerpt, pag 435

http://books.google.com/books?id=TO...X&oi=book_result&resnum=2&ct=result#PPA435,M1