UMAT for Zener model and Kelvin-Voigt model
Dear iMechanica community,
you can find the UMAT-implementation of a Zener model, i.e. a Maxwell model parallel to a spring, in my PhD thesis:
โUpsetting and Viscoelasticity of Vitreous SiO2: Experiments, Interpretation and Simulationโ
Technische Universitaet Berlin, Germany, 2006
https://depositonce.tu-berlin.de/handle/11303/1574
http://dx.doi.org/10.14279/depositonce-1277