Solid Models
======================

A solid model governs the relationship between deformation and stress in a solid
(or porous) material.  GEOS provides interfaces for both small and large
deformation models, as well as specific implementations of a number of well
known models.

.. toctree::
   :maxdepth: 1

   Theory
   Voight
   Plasticity
   ElasticIsotropic
   ElasticIsotropicPressureDependent
   ElasticTransverseIsotropic
   ElasticOrthotropic
   DruckerPrager
   DruckerPragerExtended
   ModifiedCamClay
   DelftEgg
   Damage
   ViscoPlasticity