The same limitation also exists for simple models with one section. Original S-FEM can’t resolve following difficulty: using a specific smoothing domain in this part of the models, which is prone to some kind of numerical problems, and the other parts use other alternative smoothing domain that are easy to implement, save time, and have the same calculation accuracy. For example, when a layer in the composite material is incompressible, it is of advantageous to use smoothing domain of the Selective S-FEM for that layer, and face-based smoothing domain is used in other layers.