hermit.fenics.stress
====================

.. py:module:: hermit.fenics.stress

.. autoapi-nested-parse::

   Through-thickness stress recovery for the R-M shell (isotropic).

   Port of ``ShellStressRM`` from femo dev_coupling. Used only for stress postprocessing;
   needs the isotropic ``E``, ``nu`` (so composite stress recovery is a separate future
   concern). All gradients are plain ``ufl.grad``.

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Classes
-------

.. autoapisummary::

   hermit.fenics.stress.ShellStressRM


Module Contents
---------------

.. py:class:: ShellStressRM(mesh, w, h_th, E, nu, *, strains=None)

   

   Build isotropic through-thickness stress recovery.

   ``strains=(eps_mid, kappa, gamma)`` lets the shell form supply its own
   kinematics. The fallback preserves the existing constructor surface while
   using the same constant-normal definitions.















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   .. py:method:: cauchy(xi2)


   .. py:method:: eps(xi2)


   .. py:method:: gamma_2(xi2)

      
      Transverse shear, constant through the thickness for RM kinematics.

      When the shell form supplies its strains, use its ``gamma`` rather than
      recomputing: the local form here differentiates ``u(xi2)``, which carries a
      ``xi2 * grad(E2)`` term that is non-zero on a warped cell under rigid-body
      motion -- the same defect as issue #7, in the shear slot. The supplied
      ``gamma`` is built from ``grad(u_mid)`` and cancels exactly.















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   .. py:method:: inplane_stress(xi2)


   .. py:method:: u(xi2)


   .. py:method:: von_mises(xi2)


   .. py:attribute:: Dmat


   .. py:attribute:: E01


   .. py:attribute:: E012


   .. py:attribute:: G


   .. py:attribute:: mesh