This work presents a series of benchmarks and the consequent analysis of the results for the non-linear shell element implementation within Kratos program of CIMNE research organization at the UPC BARCELONATECH University. The theoretical basis of the shell elements is the corotational (CR) formulation of finite elements. The benchmarks were selected to demonstrate the efficiency and accuracy of the present shell elements under several linear and non-linear stress/strain cases with small and large displacements. All the results of the shell elements showed good agreement with the references or the analytical solution. Comparison with other commercial codes (Abaqus and Xfinas) was also made in order to establish not only the correctness of the formulation but the accuracy towards current standards.