Hello Jorgen,

Thank you for your response. In regards to theÂ **F**e tensor, I am having difficulty understanding where to take data from. In particular, I am utilizing the (2005) paper to try and replicate your stress-strain plots for PTFE at -53 C. While using the BB model, network B calls for the 8-chain model (same as network A) except now the **F**e deformation matrix is being used. I am not exactly certain how to get this tensor. I am using the function Grabit in MATLAB to get data from the plots in order to try and replicate them via the BB model. When I attempt to model this data in MATLAB, my plot does not look as it should and I think the issue revolves around the deformation matrices. Hopefully that gives a little more specificity for the question. Â

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Attached are the plots I am attempting to replicate.

FIGURE 1: I am pulling data from the -53 C curve and using the true strain to form theÂ **F** tensor.Â

FIGURE 2: Pulling data from this curve to generateÂ **FeÂ **matrix?

FIGURE 3: My plots from MATLAB