The data attached below is a fixed strain frequency sweep at a particular isothermal conditions. Can anyone look into my data and clear my thought regarding...
1. Whether my input strain value is right or wrong?
2. What we mean by negative tan delta?
Sorry but in this form I can not try to help.
Please bring it at least in a clear table or better make plots of the relevant parameters.
Thank you
Here is the plot for dynamic strain Vs time for a frequency sweep cycle (1Hz to 600Hz) at 300C.
Thank you
I fear that even though fixing the strain value for the experiment the plot is showing erratic behavior which doesn't look like any dynamic model, but if we plot the dynamic strain value vs time we will get a recurring plot for the total time span. The DMA used was "Perkin Elmer DMA8000" having PYRIS software. If anyone has a proper literature or method for fixed strain and fixed force procedure than please kindly forward it to me. Your answer are always highly appreciated.
Have you checked the required force for your deformation? is it well within the limit of the system?
When you increase frequency you will need much more force, is the system capable of this? (maybe you need a smaller sample or more power, if not)
It would be better to understand if you provided a strain-frequency plot.
How does the modulus-frequency plot look like?
negative tand values should not exist, maybe some calibration is not 100% or the measured value is to close to the detection limit of the sensor.
I hope some of this helps you.
Yes, the force measured were well within the limit of the machine which is 18N. The strain-freq. plot looks similar to the strain-time plot and the modulus-frequency plot look same as any polymer's freq-modulus looks like.
I just need to pin-point where the problem is.
Thank you Matthias for your replies :)
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