Does any one have information about what is the solver used for viscoelastic problems? Since it involves time, is it explicit, implicit or something like coupled explicit - implicit (e.g. Newmark + Newton)… Or can one choose?.
Maybe someone will still find this useful. According to Dr. Dhondt’s book “The Finite Element Method for Three-Dimensional Thermomechanical Applications”, which is basically a theory guide for CalculiX, it seems that this software uses implicit time integration (backward Euler scheme) along with Newton-Raphson method for *VISCO procedure.