Ogden

[MechE]

Can anyone provide a source for Ogden constants I will need for an FEA analysis. Eventually I will have to measure my own, but for the time being it would help in setting up and debugging the FEA model. The material I will be using is Neoprene (chloroprene) rubber. Thanks for any help anyone can provide.

Best Regards,

MechE

[Jorgen]

Hello MechE,

Material data and a comparison of different models for Neoprene is available on the Mechanics and Materials Section (http://www.polymerfem.com/modules.php?name=Materials_Models&material=6).

Suitable material parameters for the Ogden model are:
mu0 = 0.021 MPa
alpha0 = 0.045
D0 = 0.01 /MPa

mu1 = 0.222 MPa
alpha1 = -1.133
D1 = 0.01 /MPa

mu2 = 0.014 MPa
alpha2 = 2.294
D2 = 0.01 /MPa

These parameters are in the format used by ABAQUS.

Jorgen

[Mark McClain]

Dr. Jorgen,
What would be an appropriate hardness range (Shore A) for this particular material representation?
Also, I'm looking for reference with a step by step calculation for material model parameters.

Thanks for your excellent web site!

Mark

[Jorgen]

Hello Mark,

Unfortunately I did not measure the Shore A hardness of that material. The following thread (http://polymerfem.com/forums/showthread.php?t=779), however, discusses how to convert between shear modulus and shore A hardness.

The easiest way to determine the hyperelastic material parameters is to use your FE program. More FE codes these days have a built-in tool for that.

-Jorgen