Shear stress vs. amount of shear for each of our three constitutive models, showing that the material response predicted by the three models are significantly different. In particular, the Blatz and Neo-Hookean models overestimate the shear stress compared to the fiber-based model. The material parameters are identical to that used in Fig. 10, and are listed as follows for each model: Fiber-based, λ = 3.79KPa, μ = 2.53KPa, κ = 3.61KPa, γ = 9.23; Blatz, λ = 21.97KPa, μ = 5.49KPa, γ = 11.92; Neo-Hookean, λ = 79.83KPa, μ = 19.96KPa.