On the stressed state of a non-thin transversally isotropic spherical shell with a circular hole

On the basis of a generalized theory constructed using the Fourier-series expansion of the unknowns in Legendre polynomials of the thickness coordinate we give a representation of the general solution of the equilibrium equations of a transversally isotropic spherical shell for an arbitrary approximation. On this basis we study the problem of the stressed state of a shallow spherical shell with a circular cavity on whose boundary surface there are tangential stresses varying nonlinearly over the thickness. Bibliography: 3 titles. Translated fromTeoreticheskaya i Prikladnaya Mekhanika, No. 28, 1998, pp. 19–24.     

The stressed state of a transversally isotropic body with inner elliptic crack. A linearly varying pressure on the surface of the crack

An exact solution to the problem of the distribution of stresses in a transversally isotropic elastic body with inner elliptic crack is given. An assumption that the linearly varying pressure acts on the surface of the crack is made. The intensity coefficients of stresses at the vertex of the crack are found. Bibliography: 5 titles. Translated fromObchyslyuval'na ta Prykladna Matematyka, No. 79, 1995, pp. 117–124. Original     

The thermally stressed state of a half-space with a cylindrical foreign inclusion

We propose a method of determining the thermally stressed state of semibounded bodies containing a defect in the form of a cylindrical foreign inclusion. We give the results of numerical study of the thermal stresses as functions of the geometric parameters of the inclusion. Four figures. Bibliography: 4 titles.Translated fromMatematicheskie Metody i Fiziko-Mekhanicheskie Polya, Issue 30, 1989, pp. 41–45.     

Stressed state of a piezoceramic body containing a spheroidal inclusion

An exact solution is constructed to the electroelastic problem for a medium with a sealed-in spheroidal inclusion under the assumption that the medium and the inclusion are different piezoceramic, transversally isotropic bodies with coincident axes of anisotropy. The components of the associated electroelastic field of the inclusion are plotted as functions of the external load and of the geometry of the inclusion. Numerical values of the stresses and of the projection of the electric induction vector are given for the medium in the neighborhood of the inclusion. Universidade de Beira Interior, Portugal: Institute of Mechanics, National Academy of Sciences of Ukraine, Kiev; and Ukrainian State University of Food Technologies, Kiev. Translated from Teoreticheskaya i Prikladnaya Mekhanika, No. 29, pp. 28–42, 1999.     

The stressed state of a thin coating on an elastic inclusion of optimal shape in an elastic medium

We examine the properties of the stressed state of the thin intermediate zone separating a nonhomogeneous inclusion from the matrix. Explicit expressions are given for the components of the stress tensor in the thin coating depending on the properties of the phases and the load parameters.Simferopol' University. Translated from Dinamicheskie Sistemy, No. 10, pp. 26–30, 1992.     

Propagation and interaction of short waves in a homogeneous transversally isotropic elastic medium

The Cauchy problem for the equations of motion of a homogeneous transversally isotropic elastic medium is considered. For its solution, a short-wavelength asymptotic expansion is constructed, which is also applicable near specific directions. The resonance set, i.e., the set of points at which the ray expansion cannot be used is described.     

Thermoelastic strain of a transversally isotropic cone

The exact solution to the problem of statical thermoelasticity for a transversally isotropic cone in the case where the characteristic equation has multiple roots, the surface of the cone is free of the action of external forces, and the temperature on the boundary can be represented in one variable by the Mellin integral and in a second variable, by a trigonometric series, is presented. Bibliography: 6 titles. Translated fromObchyslyuval’na ta Prykladna Matematyka, No. 76, 1992, pp. 23–32.     

Two thermoelasticity problems for an isotropic medium with a spherical inclusion in the case of perfect and imperfect thermal and mechanical contact at the phase interface

Two problems of statistical thermoelasticity are considered for an isotropic medium with spherical inhomogeneity. It is assumed that a medium with an inclusion is subjected to piecewise-uniform heating or the action of a homogeneous heat flux. As accurate solutions of the problems are constructed for various types of thermal and mechanical action at the phase interface.Translated from Teoreticheskaya i Prikladnaya Mekhanika, No. 20, pp. 14–18, 1989.     

Initial stage of plastic exfoliation of a rectangular inclusion under conditions of one-sided contact with a medium

We investigate the initial stage of quasistatic development of plastic deformations in the vicinity of the tips of a rigid rectangular inclusion whose pair of faces do not contact with a medium. Deformation is caused by shear forces that act at infinity in parallel with this pair of faces of the inclusion. The cases of plastic deformations localized in bands that develop from the tips of the inclusion and distributed continually are investigated. The characteristics of plastic zones for loads much smaller than the yield strength are obtained.     

Stress state of an isotropic shell with an elastic inclusion

Donetsk. Translated from Teoreticheskaya i Prikladnaya Mekhanika, No. 21, pp. 76–80, 1990.     

Investigation of the roots of the dispersion equation for a layered,transversally isotropic medium

To investigate the propagation of normal and damped waves in a layered, transversally isotropic medium, it is necessary to determine the complex and pure imaginary roots of the dispersion equation. The dispersion equation considerably simplifies in the case of large and small wave numbers. It is therefore possible to determine the initial and final points of all roots and to trace the entire motion of the roots between these points.Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova AN SSSR, Vol. 99, pp. 104–122, 1980.     

The quasisteady contact problem of thermoelasticity for a two-layered cylinder under frictional heating and nonideal thermal contact

In this article we give an analytic solution of the polar-symmetric quasisteady thermoelastic contact problem for a two-layer hollow circular cylinder. The problem is solved taking account of frictional heat production and thermal resistance on the mutually tangent surfaces of the components of the cylinder. On the exterior boundary of the two-layer system we study the condition of Winkler elastic fixing. In the solution we apply the Laplace transform with respect to time. We carry out a numerical analysis whose results are shown as graphs. Translated fromMatematichni Metodi i Fiziko-mekhanichni Polya, Vol. 40, No. 1, 1997, pp. 104–110.     

Stress-strain state in anisotropic multilayer shells with zones of nonideal contact between layers

Conclusions The theorem formulated here corresponds to the most general variational principle in the theory of elasticity. The equations and conditions derived from it constitute a complete system of relations necessary for defining and solving the problems which involve determining the stress-strain state in anisotropic multilayer shell structures. Assuming that some of the relations (2.2)–(2.9) are satisfied a priori, one can formulate other partial variational principles (Lagrange's, Reissner's, et al.).The result obtained here can be utilized for a correct derivation of two-dimensional equations for anisotropic multilayer shells of discrete structure, also as the starting point for devising approximate methods of solution of problems which involve determining the state of stress and strain in anisotropic multilayer shells.Translated from Mekhanika Kompozitnykh Materialov, No. 5, pp. 832–836, September–October, 1981.     

The elastoplastic stressed state of a half-plane under local nonstationary heating

We solve the thermoplastic problem for a semi-infinite plate under local nonstationary heating by heat sources. The physical equations are taken to be the relations of the nonisothermic theory of plastic flow associated with the Mises fluidity condition. The solution of the problem is constructed by the method of integral equations and the self-correcting method of sequential loading, where time is taken as the loading parameter. We carry out numerical computations of the stresses in the case of heating a plate with heat output by normal-circular heat sources. We study the problem of optimization of heating regimes in order to introduce favorable residual compressive stresses (from the point of view of hardness) in a given region of a half-plane. Two figures.Translated fromMatematicheskie Metody i Fiziko-Mekhanicheskie Polya, Issue 27, 1988, pp. 29–34.     

On the thermal stress state of transversally isotropic solids of revolution of finite dimensions

By solving the stationary thermoelastic problem for a transversally isotropic hyperboloid of revolution we conduct an analytic study of the thermal stress state of a finite solid of revolution with a meridional section of complicated shape and propose a way to solve the problem of the reliability of information obtained using the numerical methods developed and algorithms implemented on a computer. Translated fromTeoreticheskaya i Prikladnaya Mekhanika, No. 24, 1993, pp. 7–15.