Selective stiffness increasing is the path to effective structures

In the requirements of static aeroelasticity the constrained deformations usually are the torsional deformations of along-stream wing sections, because the twist values determine angles of attack and consequently aerodynamic forces. Thus, the bending deformations have no matter; this circumstance opens new capabilities for optimization of structures swept and delta wings, for which one the bending and torsional deformations are interdependent. So, for example, loosening a trailing edge of a delta wing in a direction of span and allowing thereby large vertical displacement, it is possible to reduce the twisting of along-stream sections. Naturally weakening is necessary to implement not to the detriment of safety. We suggest the method which have selectivity to kinds of deformations and reliably determine not only area of a structure, where it is necessary to add a material for reaching demanded stiffness, but also area where it is possible to weaken structure, for increasing of demanded (useful) deformations.