I cant find a clear answer on this, so Im asking in this forum and would be very happy for any insight.
Im trying to evaluate linear viscoelasticity in ABAQUS using Prony series. I dont know exactly which data to generate, and hence this question.
I have the possibility to generate loss modulus, storage modulus (and tan delta) at different frequencies and temperatures using flexural DMA. In the ABAQUS help I see they are asking for g and possibly k, which would be the shear (loss and elastic) moduli. Can I use the data from my flexural test and evaluate the shear moduli using some equation such as G=E/(2(1+v))? Is this correlation valid for not only the complex modulus bu also for the storage and loss moduli?
Or, do I have to find an external sourcing for my tests, going for a rotary oscillating test to immediately get the shear modulus?
Also, in the documentation I find it quite complicated to understand what is actually needed in ABAQUS input. In ABAQUS CAE the input should be:
Omega g* real
Omega g* imag
Frequency (Hz? rad/s?)
From what I see in the help, this would correspond to:
Omega g* real = G_loss/G_inf
Omega g* imag = 1-(G_storage/G_inf)
where G_inf is then calculated from the long term Youngs modulus of the material using G_inf=E/(2(1+v)) where v = poissons ratio.
So, to summarize this long post:
Can I use flexural DMA to evaluate the Prony-series in ABAQUS?
Have I understood correctly that I should not input the raw data, but re-calculate those before input into the software.
Frequency is measured in Hz (periods/s).
Thank you in advance for any insight on this.