Learning Forum

[m.caragiuli]

Hi,

I just have a curiosity. I have to define a hyperlastic material in engineering data, but I have the values of 2 parameters regarding Mooney Rivlin model, thus I'm wondering if it is sufficient to insert the values of c10 and c01 or if I have to use experimental data to perform a curve fitting in order to get the values for the paramters.

Thank you

[utkug]

Hello Nyla,

It should be sufficient to use c10 and c01 parameters. If you open Mooney-Rivlin two-parameter under the hyperelastic models, you can see the material constants. Do you also have the incompressibility parameter D1?

Utku

[m.caragiuli]

The article I'm taking the values from assumes D1 as 0, but I've read in this community that for hyperelastic materials it is better to set a value for D1 that closes such as 0.001 since the material cannot be fully incompressible. 

Beside this, I'd like to ask you if it is right the following assumption: since I have to model the behaviour of a hyperelastic material, before finding in literature the values of the material I am interested in, I tried a general approach suggested by a video in which an elastomer sample (Mooney-Rivlin) was taken from the engineering data sources (see the image)

and a 5 parameters Mooney Rivlin model was used for the curve fitting in order to get the values for all the parameters, even if the test was uniaxial by defalut. 

Thus, if the test is uniaxial the parameters c20, c11, c02 are correct? Can I use this model for a hyperelastic material which has a great deformation?

Thank you!