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Viscoelasticity in UMAT

Viscoelasticity Kelvin-voigt model in Abaqus

Hi all,

I'm trying to model kelvin-Voigt type material (response of it during time)

The equation is very basic : sigma*epsilon+d/dt epsilon*viscosity coefficient(eta)

i'm wondering how to impliment the viscous term eta in Pa.s (experimental results gave me the value) in my model.

The theory is very simple but i can't figure out how to do such thing in Abaqus.

I tried Pony type but i don't now how to calculate the coefficients..

 

Can you help me?

Viscoelasticity in UMAT

I want to model a viscoelastic material using UMAT in Abaqus. I am facing two problems:

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