Dear All,
My name is Daniel Shriver, and I am a PhD student at the University of Michigan. I am currently attempting to build a model using time-domain viscoelasticity frequency data. This material will be subjected to cyclic loading in which it will dissipate some energy in the form of heat from the viscous portion of the material. When I run the model everything looks accurate. Energy is dissipated (viscous dissipation) and the stresses look good. However, even though I used an inelastic heat fraction of 1, no heat flux is present and no temperature change occurs. Just as a side note I used converted data gathered from a DMA test that I ran and then fit the data with 6 Prony parameters as well with a .0075 Average RMS error. I also used the WLF shifting parameters (also from DMA).
When I tried to define this material as hyperelastic (Yeoh) along with some system coeficients derived from the prony parameters, it generated heat but this is not a very accurate model of the behavior of the material. From the Abaqus documentation, the method of treating this as a viscoelastic material should work. Any help or suggestions would be much appreciated. Thank you very much for your time.
Ps. Attached is the table that I entered in for the viscoelastic parameters (frequency data) in case someone wants to try generating heat themselves.
Sincerely,
Daniel Shriver
I have an example that I give in one of my training classes that is similar to your question (except that I use a non-linear viscoelastic material model). And it works just fine.
Are you using a coupled thermo-mechanical analysis step?
-Jorgen