A mixed-enhanced formulation tetrahedral finite elements

This paper considers the solution of problems in three-dimensional solid mechanics using tetrahedral nite elements. A formulation based on a mixed-enhanced treatment involving displacement, pressure and volume e ects is presented. The displacement and pressure are used as nodal quantities while volume e ects and enhanced modes belong to individual elements. Both small and nite deformation problems are addressed and sample solutions are given to illustrate the performance of the formulation