Implementation of an generic solid element for large deformations and large strain

I'm working at the implementation of a generic solid element for MBDyn (solid-element). It uses a total Lagrange formulation and supports arbitrary constitutive laws including hyper-elasticity. Static and dynamic models are supported including gravity loads and rigid body kinematics. Nodal Cauchy-stress and Green-Lagrange strains can be written to a new output file. The following types of elements are available right now:

8-node hexahedron
20 node hexahedron
20 node hexahedron with reduced integration
15 node pentahedron
10 node tetrahedron

An enhanced assumed strain formulation or fully incompressible materials are not supported right now. If you know a good element type or a special feature to be included, please let me know!

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