The stress-deformed state of a packet of cylindrical shells taking account of friction

We propose a method of determining the contact pressures between the shells in a packet under the influence of nonlinear internal and constant external pressure. Using the equations of the general moment theory of shells we determine the stress-deformed state of a packet of finite cylindrical shells taking account of frictional forces on the contacting surfaces. One table. Bibliography: 10 titles.Translated fromMatematicheskie Metody i Fiziko-Mekhanicheskie Polya, Issue 30, 1989, pp. 94–98.     

Optimization of the thermoelastic state of an element of a T-joint under local heating

We give a mathematical formulation of the problem of optimizing the stressed state of a T-joint under local heating and propose a method of solution based on the finite element method. We give the results of numerical solution of specific problems. Translated fromMatematichni Metodi ta Fiziko-mekhanichni Polya, Vol 39, No. 1, 1996, pp. 115–118.     

On the theory of thermoelastic bending of reinforced shells and plates

The author examines an approach to the construction of a theory of thermoelastic bending of arbitrarily reinforced shells and plates that takes into account the actual structure, the deformation characteristic, and the actual thermomechanical properties of the elements which make up the composite. The final equations are obtained with and without allowance for transverse shear strains. The problem of the thermoelastic bending of a thin, arbitrarily reinforced rectangular plate hinged at the edges, when transverse shear strains can be neglected, is considered as an example.Institute of Hydrodynamics, Siberian Division, Academy of Sciences of the USSR, Novosibirsk. Translated from Mekhanika Polimerov, No. 5, pp. 861–873, September–October, 1972.     

Fundamental solution for thermoelastic bending of orthotropic spherical shells

A fundamental solution is constructed for the thermoelastic bending of thin gently curved orthotropic spherical shells. Newtonian heat exchange with the surrounding medium is taken into account. Numerical results are given for the case of symmetric heat exchange. Donetsk State University. Translated from Teoreticheskaya i Prikladnya Mekhnika, No. 30, pp. 126–132, 1999.     

On the bending and tension of thermoelastic shells undergoing phase transitions

Applying the general non-linear theory of shells undergoing phase transitions, we derive the balance equations along the singular surface curve modelling the phase interface in the shell. From the integral forms of balance laws of linear momentum, angular momentum, and energy as well as the entropy inequality we obtain the local static balance equations along the curvilinear phase interface. We also derive the thermodynamic condition allowing one to determine the interface position on the deformed shell midsurface. The theoretical model is illustrated by the example of thin circular cylindrical shell made of two-phase material subjected to tensile forces and bending couples at the shell boundary. The elastic solution reveals the existence of the hysteresis loop whose size depends upon values of several loading parameters. (© 2009 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)     

A solution of the steady state thermoelastic equations

Résumé Une solution particulière des equations d'équilibrium thermoélastique est derivée d'une fonction potentielle. Cette solution est combinée avec les solutions connues des equations élastostatiques et appliquée à la solution d'une classe particulière de problèmes aux limites.     

Optimization of the thermostressed state of piecewise homogeneous glass shells of revolution during thermal processing

We propose a physico-mathematical model and state a problem of stress-optimization of regimes for heating thin piecewise homogeneous glass shells of revolution with given ranges of admissible temperature and stress values by means of an optimal choice of temperature for the surrounding medium. To solve the problem we apply the method of local variations with a specially chosen initial value of the control function and numerical analytic solution of the corresponding direct problem of thermomechanics for the shell in question.Translated fromMatematicheskie Metody i Fiziko-Mekhanicheskie Polya, Issue 36, 1992, pp. 52–56.     

Modeling of thermoelastic processes in heterogeneous anisotropic shells with initial deformations

A refined mathematical model of the dynamic problem of coupled thermoelasticity of heterogeneous anisotropic shells taking into account the anisotropy of thermomechanical properties of the material both in the median surface and in the transversal direction is developed. The model includes initial deformations and is based on the assumption that the components of the vector of displacements and temperature are linearly distributed over the thickness. The reliability of the proposed model is evaluated by comparing the solutions obtained on its basis with the corresponding solutions obtained by using the theory of elasticity.     

Modeling and steady state analysis of the extensible thermoelastic beam

In this work we formulate a nonlinear mathematical model for the thermoelastic beam assuming the Fourier heat conduction law. Boundary conditions for the temperature are imposed on the ending cross sections of the beam. A careful analysis of the resulting steady states is addressed and the dependence of the Euler buckling load on the beam mean temperature, besides the applied axial load, is also discussed. Finally, under some simplifying assumptions, we deduce the model for the bending of an extensible thermoelastic beam with fixed ends. The behavior of the resulting dissipative system accounts for both the elongation of the beam and the Fourier heat conduction. The nonlinear term enters the motion equation, only, while the dissipation is entirely contributed by the heat equation, ruling the thermal evolution.     

Biharmonic solutions to the steady-state thermoelastic problems in three dimensions

Zusammenfassung Die Kelvin-Almansi-Darstellung einer Bipotentialfunktion vermittelst zweier harmonischer Funktionen wird zur Lösung elastischer Wärmespannungsprobleme für stationäre Temperaturfelder angewendet.Es werden die Wärmespannungen infolge willkürlicher stationärer Temperaturfelder in einigen fundamentalen Bereichen, nämlich im Halbraum, in der dicken Platte und in der Vollkugel untersucht.     

Optimization of axisymmetric membrane shells

Problems of the joint optimization of the shape and distribution along the meridian of the thickness of membrane shells of revolution under the action of axisymmetric loads are considered, taking account of the constraints concerning the strength of the shell and the volume of its cavity. General formulations of problems of the optimal design of shells of revolution are given and the optimal shape of a shell and the corresponding thickness distribution are investigated. Results of the exact solution of problems of the optimal design of closed shells of revolution when there is an internal pressure are presented. The simultaneous introduction of two control functions, describing the shape of the shell and the distribution of its thickness, not only ensures a substantial reduction in the mass of a shell but also leads to significant mathematical simplifications, which enable the solution of the optimization problem being considered to be obtained in an analytical form.     

Quaternionic representation of the 3D elastic and thermoelastic boundary problems

This paper contains new representations of the 3D elasticity and thermoelasticity problems, expressed in terms of regular quaternion functions, which in 3D and 4D have properties analogous to those of complex analytical functions in 2D. The known and some new results, described in the paper, are used to formulate boundary 3D problems, related to the theory. The formulae obtained are very similar to those given by Muskhelishvili for 2D boundary problems. The obtained representations can be used for development of a 3D boundary element method in numerical analysis.     

Boundary value problems in the theory of binary mixtures of thermoelastic solids

In this paper the diffusion model of the linear theory of thermoelasticity of binary mixtures is considered. The basic properties of wave numbers of the longitudinal and transverse plane waves are established. The interior boundary value problem (BVP) of steady vibration of binary mixtures of thermoelastic solids is formulated. The existence theorems of eigenfrequencies of the BVP of steady vibrations are proved. The connection between plane waves and existence of eigenfrequencies is established. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)