Uncoupled thermoelastic analysis for a thick cylinder with radiation

AbstractAn attempt has been made to study the uncoupled thermoelastic response of thick cylinder of length 2h in which heat sources are generated according to the linear function of the temperature, with boundary conditions of the radiation type. This approach is based upon integral transform techniques, to find out the thermoelastic solution. The results are obtained in terms of Bessel functions in the form of infinite series

(R2028) A Brief Note on Space Time Fractional Order Thermoelastic Response in a Layer

In this study, a one-dimensional layer of a solid is used to investigate the exact analytical solution of the heat conduction equation with space-time fractional order derivatives and to analyze its associated thermoelastic response using a quasi-static approach. The assumed thermoelastic problem was subjected to certain initial and boundary conditions at the initial and final ends of the layer. The memory effects and long-range interaction were discussed with the help of the Caputo-type fractional-order derivative and finite Riesz fractional derivative. Laplace transform and Fourier transform techniques for spatial coordinates were used to investigate the solution of the temperature distribution and stress functions. Numerical investigations are also shown graphically for non-dimensional temperature and stress for different space and time fractional derivative values, respectively. In addition, some applicable limiting cases are discussed for standard equations, such as wave equation, Laplace equation, and diffusion equation

ANALYSIS OF THERMAL STRESSES AND DISPLACEMENT IN A THICK ANNULAR DISC

In this present work, a boundary value problem for thick annular disc subjected to thermal load with radiation type boundary conditions is solved. Some features of the stress and temperature distribution are investigated by means of Integral transform technique. Analytical expressions for the components of the displacement and temperature distribution vector that correspond to the stress state under the action of partial distribution are established. The result is obtained as series of Bessel functions. In addition a special case is discussed by taking the account to diametric compression of thick disc subjected to uniform pressure on opposite segments. In this stress distribution are investigated by theoretical technique. The above mentioned special case is developed by technique used by Yu. V. Tokovyy for determination of stress under diametral compression

Thermal Stresses of a Thin Annular Disc Due to Partially Distributed Heat Supply

Results of an analysis of the plane stress state of a thin annular disk subjected to uniform partially distributed heat supply are presented. Some features of the stress distribution are investigated by means of both theoretical technique and numerical testing. Analytical expressions for the components of the displacement and temperature distribution vector that correspond to the stress state under the action of partial distribution are established

Analytical Thermal Stress Analysis in a Thin Circular Plate Due to Diametrical Compression

In this present work, analytical approach is establish to construct solution in terms of stresses in a thin circular plate subjected to steady and unsteady state thermoelasticity due to diametrical compression. In this approach stress distribution are expressed by means of theoretical technique. The result is obtained as series of Bessel functions

Analysis of Coupled Thermal Stresses in a Axisymmetric Hollow Cylinder

An attempt has been made to study three dimensional coupled thermoelastic response of infinitely long hollow circular cylinder due to axisymmetrical heating, considered under the thermo-mechanical coupling effect. This approach is based upon integral transform techniques, to find the thermoelastic solution. The expression for both the temperature and the stress distribution are determined from field equation of motion. Numerical calculations are carried out and results are depicted graphically

Thermosensitive response of a functionally graded cylinder with fractional order derivative

The present paper deals with thermal behaviour analysis of an axisymmetric functionally graded thermosensitive hollow cylinder. The system of coordinates are expressed in cylindrical-polar form. The heat conduction equation is of time-fractional order02<α≤, subjected to the effect of internal heat generation. Convective boundary conditions are applied to inner and outer curved surfaces whereas heat dissipates following Newton’s law of cooling. The lower surface is subjected to heat flux, whereas the upper surface is thermally insulated. Kirchhoff’s transformation is used to remove the nonlinearity of the heat equation and further it is solved to find temperature and associated stresses by applying integral transformation method. For numerical analysis a ceramic-metal-based functionally graded material is considered and the obtained results of temperature distribution and associated stresses are presented graphically

Thermoelastic Analysis of Functionally Graded Hollow Cylinder Subjected to Uniform Temperature Field

This paper deals with the determination of displacement function and thermal stresses of a finite length isotropic functionally graded hollow cylinder subjected to uniform temperature field. The solution of the governing thermoelastic equation is obtained, as suggested by Spencer et al. for anisotropic laminates.  Numerical calculations are also carried out for FGM (Functionally graded material) system consisting of ceramic Alumina (Al2O3), along with Nickel (Ni) as the metallic component varying with distance in one direction and illustrated graphically

Alternative Approach To Wolfe’s Modified Simplex Method For Quadratic Programming Problems

In this paper, an alternative approach to the Wolfes method for Quadratic Programming is suggested. Here we proposed a new approach based on the iterative procedure for the solution of a Quadratic Programming Problem by Wolfes modified simplex method. The method sometimes involves less or at the most an equal number of iteration as compared to computational procedure for solving NLPP. We observed that there is change in the rule of selecting pivot vector at initial stage and thereby for some NLPP it takes more number of iteration to achieve optimality. Here at the initial step we choose the pivot vector on the basis of new rules of method described below. This powerful technique is better understood by resolving a cycling problem

Emerging issues related to COVID-19 vaccination in patients with cancer

Coronavirus disease 2019 (COVID-19) has resulted in millions of deaths globally. The pandemic has had a severe impact on oncology care and research. Patients with underlying cancer are more vulnerable to contracting COVID-19, and also have a more severe clinical course following the infection. The rollout of COVID-19 vaccines in many parts of the world has raised hopes of controlling the pandemic. In this editorial, the authors outline key characteristics of the currently approved COVID-19 vaccines, provide a brief overview of key emerging issues such as vaccine-induced immune thrombotic thrombocytopenia and SARS-CoV-2 variants of concern, and review the available data related to the efficacy and side effects of vaccinating patients with cancer