B-W model is not easy to use for your purposes. I developed a model (theory) which is much more user-friendly. In my model all you need is to integrate the experimental stress-strain curve. This integral provides you with the loading function F(strain), which you can use for any plastic deformation process including bulk forming or fatigue. You can read about the theory in my paper "Bifurcation Theory of Plasticity, Damage and Failure", which you can find in ResearchGate or hereArticle Bifurcation Theory of Plasticity, Damage and Failure

Good luck.