One more question:
It's about calculating the complex modulus out of the material response.
I tried to use just one 2D-Element, and did just a direct-solution-steady-state-dynamic-step. Again the same oszillating boundary-condition with amplitude of 0.001mm is applied, as mentioned above in the more complex model. I defined again the storage and loss modulus as constant over a range of frequencies. The frequency-sweep goes 100Hz to 1600Hz.
The question is, which model response characteristics should be measured or where in the model (upper support or down at the oszillating BC)?
I used the reaction forces in load-direction and the corresponding phase angle. But i don't get the values of the input. So for example with the rate of stress and strain i don't get the value for the complex-modulus-magnitude.
So, where is my mistake? I suppose this should work for such a simple model.
Is it maybe the definiton of the moduli over a frequency-range? I recognized strong dependency of e.g. the amount of points defined. Does ABAQUS change it into relaxation functions or how does that work?
Or should i measure my values anywhere else in the model (but there aren't much possibilities)? So e.g. the phase angle differs in the model positions (over a range of 180 degrees).
So hopefully someone could help me, i just have one week left of my masters degree.
Thanks a lot!
skrn
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