Model Theory The Three Network (TN) model is a modern material model for predicting the non-linear viscoplastic response of thermoplastic materials. I developed this material model in an effort to create an accurate and simple material model that can accurately predict the thermomechanical response of thermoplastic materials. During the last few years I have repeatedly seen excellent results from this model. I have been so pleased with the model that it has become my default go-to model for t...