Danylchenko D. Unstationary waves in piecewise and homogeneous isotropic shells

The object of research is the investigation of the influence of various geometrical and physic mechanical parameters of shell parts and parameters of strain pulse on shell unsteady movement. The object of research - thin compound shell constructions under unstationary impact-typed dynamic loadings. An object of research is qualitative and quantitative parameters of wave propagations in partially-homogeneous shell constructions. Research methods: in work the equations of movement of shells of the linear and nonlinear theory of Timoshenko are used. Method of characteristics is applied to the numerical problems solving. The unified approach for the problems solving about wave propagations in partially-homogeneous shell constructions with different geometrical and physics-mechanics parameters of its components were implemented; obtained solution of some problems, including the new ones, which confirm efficiency of the developed method and has scientific and practical value; influence of geometrical and physics and mechanical parameters of components, and also parameters of loading which operates, on changeable movement of shell constructions were investigated. Main results of the thesis are accepted to use on JSC "Motor Sich". Use sphere is aircraft engineering, shipbuilding, oil-gas industries and other areas of modern technics and national economy branches.