evaluate hyperelastic material

[robobobo]

hi all,
my problem is:
i have a clutch made of elastomer (konstant shear strain). the load is a sinusoidal moment of rotation. i use hyperlasticity with viscoelasticity.
abaqus has a funktion to evaluate the material (hyperelasticity) when you fit it with experimental test data.
my question is: can i use test data from a quasi static load of moment of rotation? is this test data uniaxial (everywhere in clutch is the shear stress konstant)?
what do i have to attend?
thank you!

[Jorgen]

If I understand you right, you want to determine the hyperelastic parameters for a rubber based on shear test data at quasi-static conditions. That should be an OK approach.

What data do you intend to use to determine the viscoelastic properties?

-Jorgen

[robobobo]

hello dr Bergstrom,
yes, i want to determine hyperelastic parameters from a shear test, and i wanted to know if it is an uniaxial test data in my case (i thing it is).
to determine viscoelastic test data i do dynamic tests to get a hysteresis (M vs. phi). then i try to get a similar/congruent hysteresis from abaqus by changing g_i-prony and tau_i-prony in the time domain. in the end i compare the loss or the starage modulus from tests with abaqus. if the hysteresis are similar i look what happens in abaqus when i change the frequency or the amplitude (is the hysteresis still similar to my tests?). that´s my task.
do you think my way of thinking is right?
or what do you propose to do to determine viscoelastic propertis?

thank you!

rob

[Jorgen]

I think your approach sound fine.
Best of luck.

- Jorgen