Mixed-enhanced formulation for geometrically linear axisymmetric problems

A four-noded quadrilateral axisymmetric formulation in the context of a mixed-enhanced method is presented. The strain 9eld is represented by two sets of element parameters, which results in enhanced performance and coarse mesh accuracy in bending dominated problems and locking-free response in the near incompressible limit. The mixed 9elds presented are such that variational stress recovery is permissible. In addition, the formulation is cast such that the mixed parameters are obtained explicitly yielding 9nite element arrays with the proper rank using standard order quadrature. In this paper our attention is restricted to the area of geometrically linear problems in solid mechanics. Representative simulations show favourable performance of the formulation