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I have implemented a viscoelastic model (Simo/Hughes approach: Prony series for small strain)
in Abaqus using Umat and it works fine for dynamic isothermal simulations (I validated with the Prony series implemented in Abaqus).
Now, I want to consider thermal loads (I have temperature dependent stiffnesses from a DMA experiment).
How should I use these temperature dependent stiffnesses in the model?