Numerical optimization and variational techniques, Elastic materials, Finite element methods applied to problems in solid mechanics, Nonlinear elasticity, numerical implementation, Materials of strain-rate type and history type, other materials with memory (including elastic materials with viscous damping, various viscoelastic materials), closed-form expression for the consistent elastoplastic tangent moduli, Other numerical methods in solid mechanics, constitutive integration algorithm, radial return algorithm, exact linearization, Software, source code, etc. for problems pertaining to mechanics of deformable solids, algorithmic treatment, hyperelastic J(sub 2)-theory, Plastic materials, materials of stress-rate and internal-variable type