  We use the augmented Lagrangian formalism to derive discontinuous Galerkin
formulations for problems in nonlinear elasticity. In elasticity stress is
typically a symmetric function of strain, leading to symmetric tangent
stiffness matrices in Newtons method when conforming finite elements are used
for discretization. By use of the augmented Lagrangian framework, we can also
obtain symmetric tangent stiffness matrices in discontinuous Galerkin methods.
We suggest two different approaches and give examples from plasticity and from
large deformation hyperelasticity.
