Fig. 5.

Schematic account of fiber-sheet remodeling from Fig. 4. Apex: because the initial sheet angle is predominantly negative (β < 0), a positive sheet shear (E_sn > 0) is associated with reduction in radial strain (E₃₃ < 0), or wall thinning. Sheet extension (E_ss > 0) is associated with increase in radial strain (E₃₃ > 0), or wall thickening. The net effect is no change in wall thickness (E₃₃ ~ 0). Base: initial sheet angle is predominantly positive (β > 0); therefore, a positive sheet shear (E_sn > 0) is associated with increase in radial strain (E₃₃ > 0), or wall thickening. Because sheet extension is also associated with increase in radial strain, the net effect is significant increase in wall thickness (E₃₃ > 0).