2. Benchmark solution

The reference solution is obtained by solving the problem numerically using the STAT_NON_LINE command. The constraint field and the internal variables field are thus obtained.

The load increment is discretized in 2 moments between 0 and 1.

An elastic prediction is made, and the tangent matrix is re-updated at each iteration and at each increment.

The convergence table is shown below:

Figure 2-1: Reference convergence table