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Hello,
I have implemented a linear viscoelastic model using the user subroutine Usermat in Ansys.
I have used the classical paper: "Formulation and implementation of three-dimensional viscoelasticity at small and finite strains" of Kaliske & Rothert (Simo's approach) and it works fine for small deformations.
It is written in the documentation that in the case of a simulation with large strain (geometric nonlinearity), one must rotate the state variables.
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