As shown in Fig. 2, while for the quadratic elements the convergence rate is nearly equal to the theoretical one,
for the linear elements the convergence rate, obtained applying the new methodology, is higher than the theoretical
one for what concerns the stresses; the opposite is true regarding the displacements. This is an extremely interesting
and powerful result for stress estimation, especially from the commercial point of view, because accepting a small
loss in the accuracy of the solution, the use of the linear elements leads to a solution characterised by a higher
convergence rate, along with a sensible reduction in the computational cost, compared with the quadratic elements.