Im trying to model a viscoelastic material in Abaqus/Standard 6.6.2 and am most interested in rate dependance. Ive created a model using *HYPERELASTIC defintion with Mooney-Rivlin constants, and *VISCOELASTIC using a time domain Prony series derived from constant strain rate uniaxial tension test data.
My model is sized to match the uniaxial tention test specimen, but when I run the model with different loading rates, the results are exactly the same. The rate dependance that should be reflected in the Prony series does not appear. Ive tried running it using both *VISCO and *DYNAMIC.
Is there some keyword that Im missing to alert Abaqus to the fact that this material is viscoelastic? Any help would be greatly appreciated.
- Dan Glanz