Hi.

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.

Best regards