2. Benchmark solution

The same study is done locally and non-locally. We compare the smallest eigenvalues of the tangent operator calculated with the standard buckling criterion locally (which will be taken as a reference) and with the new criterion in non-local. D_ PLAN modeling is used locally, D_ PLAN_GRAD_VARI modeling is used non-local. The loading is carried out over a period of 100 steps of time, so as to visualize the passage through a state of non-zero damage to the structure. The test is considered successful if the relative deviation does not exceed 0.01%.