Sample determination

Manfred Achenbach — Mon, 31 Dec 2007 15:40:39 -0500

Sample determination methods for the viscoelastic model can be found at

http://www.viscodata.de/

calibration method

Aaron Goh — Wed, 08 Aug 2007 18:33:28 -0400

In ABAQUS, the Prony series can be input as ratios, i.e. Ei/sum Ei. Sample calibration methods for the viscoelastic model can be found at

dx.doi.org/10.1023/B:MTDM.0000046750.65395.fe

and for viscoplastic model at

dx.doi.org/10.1016/j.actamat.2007.02.035

Abaqus - Linear Viscoelasticity

Shailendra — Wed, 08 Aug 2007 12:37:51 -0400

Hi Roham,

Your approach appears reasonable for Abaqus. I am not aware of the required format for MSC.Marc.

Abaqus has another useful capability in that you can input the relaxation curve (test data) and the software internally calculates the Prony coefficients (limited to 13 coefficients, which I think is sufficient in most cases). However, in that case you have to provide shear or volumetric test data. You could check recent Abaqus version for more details.

If you are using visco-elasticity model (again Abaqus) you have to use *Elastic and *Viscoelastic. I don't think Abaqus allows *Plastic with *Viscoelastic option (but I need to double-check). On the other hand, if you want to include (rate-dependent) plasticity you may have to resort to a visco-plastic option. Essentially, you will then model an elastic/visco-plastic material.

I shall be glad to hear back from you.

All the best.

Thanks,

~Shailendra

iMechanica - MSC Marc - Comments

Sample determination

calibration method

Abaqus - Linear Viscoelasticity