Discussion Forum

Dear Gaurav,

It’s not the easiest way but you can implement the viscoelastic material in COMSOL as ODEs (Ordinary Differential Equations). That gives you total control over the rheological network structure of the viscoelastic material. You have to derive the equations though. I will be presenting a paper showing how to do this in more details at the NAFEMS World Congress 2015 in June in San Diego.

Nagi Elabbasi
Veryst Engineering

Hi,

You can also do like this: Separate the second Maxwell unit into the spring and the damper. By some algebra, you can move the spring into the Generalized Maxwell material by changing the material properties.

Now you have a modified Generalized Maxwell material in series with only a damper. But a damper is a special case of pure creep, so you can then add a Creep node with either

a) Norton creep with exponent n=1

or

b) Deviatoric creep

to simulate that part.

Regards,
Henrik

Thankyou for the reply .

Thank you for the suggestion .

Dear Dr. Elabbasi,

I am currently studying the modeling of viscoelastic material using COMSOL and like to do it without the structural module.


I was wondering whether you could share the paper that you model the viscoelastic material using ODEs node.

Thank you very much,

--
Bhagya

Sorry Bhagya this is a client model that I cannot share beyond what was presented in the conference I mentioned above and at last year’s COMSOL Conference in Boston: www.comsol.com/paper/download/257801/elabbasi_presentation.pdf.