UTRSNETWORK

The input file consists of one element with the material response specified using the parallel rheological framework with three viscous networks. In networks one and three the reduced times were used with the shift function approximated by the Williams-Landel-Ferry and Arrhenius forms defined in user subroutine UTRSNETWORK. The element is preloaded in the first static step in which viscous effects are not active. In the second, quasi-static, step the viscous effects are activated and the temperature is increased instantaneously at the beginning of the step. A constant load is maintained throughout the step, so the material is subjected to creep. The results were compared to the results obtained with an almost identical model that uses the same shift functions specified using the built-in Abaqus functionality.