Fig. 8.

Prestrain. The first column shows the experimental setup. The second column shows the geometric representation using a B-spline patch with the overlaid contour plot of the total area change ϑ^p, which averages 1.44. The third and fourth columns show the contour plots of the anisotropic prestretches ${\lambda }_1^{\mathrm{p}}$ and ${\lambda }_2^{\mathrm{p}}$ in the directions parallel and perpendicular to the midline, both directions exhibit average values 1.21