4. Conclusion

The results obtained with extrapolation displacement method are in a good agreement, with less than 5% error compared to the analytical solution of T-stress. It should be noticed that the asymptotic relationship of displacements is valid only for \(r\) tending towards 0. Therefore, it is necessary to take care not to choose too large a domain of extrapolation (distance \(\mathit{dmax}\) from operator POST_T_Q of about 4 to 5 elements).