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?
(I was thinking of using a UMAT but i don't know how to derivate epsilon with time.)
Thanks a lot,
Best regards,
Raphael
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