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How to calibrate Prony series from DMA experimental data DMA temperature/time domain?


Sebastian Tamayo-Vegas
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(@sebasmautv19)
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Hi Everyone,

 

For my project, I need to model the viscoelastic properties (i.e. Storage and Loss Modulus. ) of my nanocomposite as a function of temperature; I have performed a DMA test in the plain epoxy sample, I obtained the Storage and Loss Modulus as a function of temperature, the frequency was kept 1hz. 

For this, I need the Prony Series, is it possible to calibrate with the temperature domain? 

In the picture below I tried to calibrate with some frequency values (not real) to see the prony series but even with this the calibration does not succeed. 

Regards

Sebastian Tamayo-Vegas

 

3 Replies
Jorgen
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Hello Sebastian: If all you have is E'(temp) and E''(temp), then you unfortunately don't have enough info to find the Prony series. You need a some more info about how E' and E'' depend on the frequency.

If you like, I can help you with your test calibration of the Prony series with (not real) data. Just send attach the mcal-file to another message, and I'll take a look.

/Jorgen

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Sebastian Tamayo-Vegas
Posts: 2
Topic starter
(@sebasmautv19)
New Member
Joined: 1 month ago

Hi Jorgen,

Thank you for your reply.

My experimental data also contains the following: Time, Temperature, Storage, Loss,  Stress,  Tan, Frequency(constant), Drive, Amplitude, Strain, Displacement, Static, Position, Length, Force, Stifness.  

The DMA file is attached.
 

 

Is it still not enough to obtain the Prony Series?

 

Also, please find attached the M Calibration file

 

Regards

Sebastian

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Jorgen
Posts: 3924
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Hello Sebastian,  I started to look at your files and I noticed that your experimental storage modulus is decreasing A LOT with increasing frequency. That does not make sense. The storage modulus should increase with frequency. Can you check you experimental data again?

/Jorgen

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