Колебания неосесимметричного цилиндра в заполненной жидкостью полости, совершающей вращательные осцилляции

The behavior of a cylindrical solid of nonaxisymmetric cross section in a horizontal cylindrical cavity filled with a viscous incompressible fluid under rotational vibrations is experimentally investigated. The effect of the vibrational suspension of a heavy nonaxisymmetric cylinder near the bottom of the vibrating cavity was found and studied at a distance comparable with the Stokes layer thickness. The character of oscillations of the cylinder and its interaction to the wall of the cavity is studied by high-speed video registration of process.

The Torsion Problem of a Cylindrical Solid Taking Into Account the Material Weakening

The weakening of the material begins reaching a critical level of stress state, is characterized by a decrease in the level of stress during growing deformations and can develop with an equilibrium accumulation of structural damage. The equilibrium accumulation of damage is possible if the given displacements of the boundary points are provided (that is, with “hard” loading) and if the rigidity of the loading system is sufficient. The design becomes unable to withstand the load only when zones with weakened connections are developed enough. Therefore, taking into account the full deformation diagram in the calculations allows to more accurately determine the load bearing capacity of the design. This paper gives an analytical solution for the problem of a homogeneous cylindrical solid torsion with a circular cross section with its hard loading taking into account the material weakening. Piecewise linear approximations of elastic and elastoplastic medium with a linear weakening at the supercritical deformation stage are considered. The diagrams are plotted regarding stress distribution over the cross section are given; the graphs of the maximum torque value and the extreme value of the relative angle of rotation on the parameters of the deformation diagram. The dependences of the torque on the relative angle of rotation of the sections for the stage of initial supercritical deformation, as well as the stage of supercritical deformation and fracture are determined. The graphs of the dependence of torque on the angle of rotation of the section are given. Reserves of the load bearing capacity of the design are identified. It is noted that taking into account the weakening of the material is expedient in strength calculations and in determination of the system’s safety factor.

The conceptual development areas in the developing technologies of plastic forming of cars’ details

Based on the analysis of the essence of localization of the deformation zone the display signs of this factor and the accompanying positive effect were established. It was the basis for combining a wide range of plastically shaped car parts into groups with the subsequent development of standard (basic) technological processes for each of them.The first group includes hollow cylindrical parts with a flange. The basis of the second group of parts are stepped shafts and axles with slots. The third group of parts are elastic elements of the car suspension, consisting of strips of variable thickness along the length. Representatives of the fourth group are cylindrical solid and hollow parts with a perpendicular end. This approach allows us to form the concept of building advanced industrial technologies.

Спектры собственных волн анизотропного цилиндрического твердотельного волновода

Dispersion properties of eigenwaves of an anisotropic cylindrical solid-state waveguide without frequency dispersion in permittivity tensor components have been analyzed theoretically. The classification of waves has been performed. E type bulk–surface eigenwaves with negative group velocities have been found. The conditions for their existence have been determined. The existence in the waveguide of E -type surface eigenwaves and pseudo-surface eigenwaves of E- and H -types has been shown.