# Inflation of a thick neo-Hookean cylinder (follower pressure)

A quarter of a tube A = 10, B = 20, one unit long, in plane strain (symmetry planes x = 0,
y = 0 and both ends), 6 × 16 hybrid hex20 elements, neo-Hookean with E = 3, ν = 0.4995
(μ = 1.00033, κ = 1000). The bore pressure p = 0.428371199 follows the deforming bore; the incompressible
closed form puts the bore at a = 15 and the outer wall at b = 22.912878475. This is the follower-pressure
case: the pressure turns with the bore and grows with its area.