materi_velocity_integrated

The integrated velocities $vi_i$ are added to the node_dof records. The integration of nodal velocities in fact results in displacements. But asking for these integrated velocities doesn't activate automatically that the calculation is done over the total deformed volume (as is the case when you initialize materi_displacement), and not automatically a total lagrange model is used in stress analysis.

Condition: also materi_velocity should be initialized because these are necessary for calculation materi_velocity_integrated.