elastomers - strain dependent behaviour ABAQUS

[valereo]

Hallo,

I need some help with the following problem:
I made some measurements with a probe of natural rubber (attached file) for my master thesis and hoped that it would be sufficient if I model the elastomer for my purpose as linear-viscoelastic only. But as you can see it has a significant dependence of strain amplitude. Now my question: is it possible to predict the measured behaviour by using the *hysteresis - option in ABAQUS?

I would greatly appreciate your assistance.

Thanks.
226
valereo

[siriushf]

This is a simplified procedure (with some variations and twists) I have used in order to model the rate dependence as well as the amplitude dependence.
http://www.byggmek.lth.se/fileadmin/byggnadsmekanik/publications/tvsm1000/web1021.pdf
I hope it's helpful
//Anders

[Jorgen]

Great Thesis Anders!

The Bergstrom-Boyce (*Hysteresis) model captures qualitatively both the strain amplitude and the frequency response of elastomers. It does not, however, do a great job of qualitatively predicting the response for industrially relevant applications.

The good news is that the Bergstrom-Boyce model can easily be extended to better capture the dynamic response. I have developed model that does this nicely - the Dynamic-Bergstrom-Boyce model. This model is commercially available (http://polymerfem.com/index.php?pageid=umats).

Send me an email if you are interested.

-Jorgen

[gerhaher]

Hi Anders!

I saw your interesting thesis in the forum and would have some questions on the subject.

I do research on rubber bearings with shear strain (displacement / height) of up to 150 %.
Did you also test the shear modulus for larger amplitudes? I would be interested in that.

Do you know about the influence of additives and the vulcanisation temperature on the shear modulus and the damping?
What do you think are the most important factores influencing the modulus and the damping?

I wondered that natural rubber sounds like a material with a large variation of the material properties. Do you know if this is so or is the quality of natural rubber always the same?

Thanks for publishing your test data!

Ulrich