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Finding Prony series coefficients using DMA

Dear colleagues,
I need your help to find the Prony series coefficients using DMA frequency sweep, so I can use them in a FEA study.

The data I got from the test are 50 points for Loss modulus, storage modulus, tan delta, strain and amplitude Vs. Frequency. I need to calculate either relative moduli Vs. relaxation time, or shear modulus Vs. time, or Bulk modulus Vs. time.
Your advice will be highly appreciated

Best regards,
Gerges Youssef

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Altair Forum User

Hi Gerges Youssef,

Are you trying to fit using solver?

If yes, are you using solver, please let us know which solver you are using?

Altair Forum User

Hi Gerges Youssef,

Are you trying to fit using solver?

If yes, are you using solver, please let us know which solver you are using?

Yes, I am tring to fit the experimental data. I have been trying to do it using ANSYS Workbench and Abaqus. I have tried to do it manually using Microsoft Excel, but so far I couldn't do.

Please advise.

Best regards,

Gerges

Altair Forum User

Hi Gerges,

Please contact ANSYS or Abaqus support regarding the solver query.

If you are doing manually, are you using loss modulus or storage modulus or both to find the prony coefficient?

Can you try with complex modulus?