# Hysteresis Modeling

Hi Dr. Bergstorm and everyone,

I have been working on the modeling of the elastometer in an application with strain level of almost 15% and maximum deformation rate of 80 1/s. One of the main issues in our product failure is fatigue and failure in high temperature, the working temperature can get as high as 120C.

I am trying to model the steady state thermal-structural analysis of our product. So far I have developed the test plan for material characterization of the structural part but I am almost blank on the thermal side of the project, especially its hysteresis part.

In theory I should be able to find the hysteresis heat generation of the elastomer from the stress-strain curve so I might not need any additional test for the hysteresis modeling. Correct?

I am using MSC.Marc and I know that there is not any direct method of calculating hysteresis heat generation within the software. Is Abaqus or Ansys any better?

In case I have to do the heat generation calculation manually and enter it to FEA process, what is the best reference or practical way for it?

Thank you

Yes, you can determine the hysteresis from cyclic loading-unloading experiments. As far as I know, neither Abaqus or Ansys can directly output hysteresis values. You will have to calculate it as part of your post processing effort.

-Jorgen

Thank you Dr. Bergstrom

Do you recommend any reference for calculating hysteresis heat generation for the coupled thermal-structural coupled analysis?

Thank you,

I would simply use the area under the stress-strain curve during cyclic loading to estimate the hysteresis.

An alternative is to extract and collect the dissipated energy during the analysis.

-Jorgen

Thank you,

I think I should study a bit more on how to do this process in coupled thermo-mechanical analysis.

Thank you again,

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