Force that depends on tangent to facet and adapts to deformation

[bleyerj]

You should use Nanson formula, see here:

Problem with inflation of neo-hookean membrane

Hi all, I have a problem simulating the inflation of a hyper-elastic membrane to increasing pressures. Since I’m new in Fenics, I started from the demo code (https://fenicsproject.org/docs/dolfin/1.4.0/python/demo/documented/hyperelasticity/python/documentation.html) and adapt it as follows: from dolfin import * import numpy as np import pdb # Optimization options for the form compiler parameters["form_compiler"]["cpp_optimize"] = True ffc_options = {"optimize": True, \ "elim…