Most analytical calculation techniques of the stress state in multi-structural elements (MSEs) are based on the assumption that the layers are deformed only in the direction of the load applied. Consequently, deformations in the perpendicular directions do not appear, or in case they do, the deformations are equal, and therefore, have no impact on the stress state. It is well-known that materials do not only exhibit deformations in the direction of the force applied, but in perpendicular directions as well. MSEs are made of materials with different mechanical properties; therefore the...