*hysteresis elastomer

[robobobo]

hello everybody,
i want to model a hysteresis loop of an elastomer simular to my dynamic-tests. Now i want to use hyperelasticity with the suboption "hysteresis". Abaqus demands the parameters S (Stress scaling factor), A(Creep parameter), m (Effective stress exponent), C (Creep strain exponent) and E? How do i get them?
I only have test data from sinusoidal dynamic tests.

thanks a lot!
Rob

[Jorgen]

Good question. The *HYSTERSIS model is quite nice :wink: (I developed it as part of my PhD work at MIT)...

You have a few different options:

(1) Use insight from your dynamic test data to estimate the parameters, and then use trial-and-error to tweak the numbers until you get a good fit.

(2) Write a computer program that takes the experimental data and automatically finds the parameters using a some type of optimization algorithm. This can be done in any computer language, including Matlab and Mathematica.

(3) I have written a complete parameter extraction program that is specifically designed to do just this. My program works with the *HYSTERESIS model and many other advanced polymer models. The program that I have written in commercially available. Send me an email message (jorgen at polymerfem.com) if you are interested.


- Jorgen