Step type for hyper-viscoelastic user-defined material in Abaqus

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Michael A Jandron

If you can neglect inertia (dynamics) and just need to capture the time dependence of the material you could consider *VISCO. What are you looking for?

Adel Tayeb

for the moment i just want to validate my umat by a simple extension and simple shear tests

Then yes, *VISCO should work. But make sure you understand the manual for this.