So a stress-strain curve: σ on the x axis and ε on the y axis. σ = F / A and ε = ΔL / L of course, L is a constant, and A is a constant if the material can be assumed to not-deform. Can a stress-strain curve therefore be thought of as a force-extension curve? i.e. essentially F on the x axis and ΔL on the y axis? That would make it a lot easier to predict properties from.