In this study, the behaviors of conforming isoparametric 4-node quadrilateral and 3-node triangular solid axisymmetric elements are improve by adding nonconforming displacement modes. The ordinary conforming solid axisymmetric elements have excessive flexural stiffness that stems from the fact that the elements adapt to flexure by deforming in shear modes. To remedy this deficiency, two methods are widely used. One is softening the element stiffness by the reduction in the order of numerical integration an the other is restoring the real flexural deformation by adding nonconforming displacement modes. But the method of reducing integration order do not satisfy invariance and in the case of 3-node triangular element (1-point integration) this method isd not usable. So, for the analysis of axisymmetric structures with flexural deformation, addition of nonconforming displacement modes to the conforming axisymmetric elements are studied.
