Hello Every one,
I am currently trying to simulate the behavior of the thermoplastic materials like HDPE and PVDF. I started reading the book of Mr. Bergstrom to understand different options of numerical modeling. As i understand the best way of modeling of these material is using the Viscoplasticity model like TNM. But as you know these models are not implicitly introduced in the abaqus and we should develop the Subroutin Umat. First I would like to know if any one here has developed the script of Umat for the viscoplastic models like TNM or BB to share with us?
secondly I would like to know how to use the nonlinear viscoelasticity in abaqus without using Subroutine? do you have any example or tutorial?