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DMTA and Prony Series

DMTA and Prony Series

DMTA and Prony Series

(OP)
Hello all,

Modelling a pipe-end socket  thermoforming-like simulation of PVC I been found a lot of problems, exactly that I try to do is this:

http://www.youtube.com/watch?v=vDW4tSda_0U

I have DMTA test results E' and E' against time and temperature sweep.
The question is how EXACTLY do I use the DMTA results and convert them to the Prony Series parameters given I have E' and E' against time and temperature sweep.

Has anyone done this before.

And how do I get the WLF or TRS data from the data that I have gathered so far.

The books I have referenced have been vague on the gap between the DMTA and developing the Prony series parameters and the WLF-TRS data.
 
Let me know if you can assist.


Test Data

Sample: 1.5mm Polyvinylchloride sheet
Geometry: Single cantilever bending 10mm x 5mm x 1.5mm
%RMS strain: 0.075
Frequencies (Hz): 0.316, 1.0, 3.162, 10.0, 31.6
Thermal profile: 2°C/minute to 120°C

Attached you'll find the DMTA graph

http://files.engineering.com/getfile.aspx?folder=cd70d4a9-fba8-41bc-bbeb-49c3a739b1e9&file=DMTA.zip

Regards

Pablo

 

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