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:
“Upsetting and Viscoelasticity of Vitreous SiO2: Experiments, Interpretation and Simulation“Technische Universitaet Berlin, Germany, 2006https://depositonce.tu-berlin.de/handle/11303/1574http://dx.doi.org/10.14279/depositonce-1277
Recent comments