Three-dimensional Transient Thermal Stresses Research Articles

A methodology to predict thermal crack initiation region of tool for high-speed milling compacted graphite iron based on three-dimensional transient thermal stress field model

A methodology to predict thermal crack initiation region of tool for high-speed milling compacted graphite iron based on three-dimensional transient thermal stress field model

Sealing Contact Transient Thermal-Structural Coupling Analysis of the Subsea Connector

Taking the subsea collect connector as an example, the sealing characteristics of the sealing structure of the subsea connector under transient thermal–structural coupling were studied. Based on Airy’s thermal stress function, the mathematical model was established, the complex stress function was used to solve the problem, and a three-dimensional transient thermal stress model of the core sealing parts was obtained. The transient thermal–structural coupling stress model of the core seal was obtained by linear superposition principle. The transient temperature field of the subsea collet connector under different working conditions was analyzed. It was found that the larger the temperature difference between the components was, the greater the difference of expansion rate was, and the greater the impact on the sealing performance of LSG was in the process of temperature variation from transient to steady distribution. Numerical simulations of various working conditions under the transient temperature field were carried out. The results showed that sudden change of the temperature and oil–gas pressure will bring about large fluctuations of the maximum contact stress and equivalent stress of the seal, which was easy to fatigue wear, and thus affect the reliability of the sealing performance. Finally, the experiment proves that the sealing ring can maintain sealing performance under the conditions of temperature-cyclic loading. The coupled mathematical model proposed in this paper could be used for the transient thermal–structural coupling theoretical analysis of similar subsea equipment.

Thermal Stress Distribution Simulation Analysis for Disc Brake of Heavy Vehicles

Aiming at the phenomenon that a large amount of friction heat produced during braking process has important influence on the contact surface of heavy vehicle, according to the actual size of the friction plate and the static slice, a three-dimensional transient thermal stress field calculation model has established, using multi-physics coupled method of ANSYS in Workbench, after the numerical simulation of disk brake, the transient thermal stress field distribution has revealed in the process of braking friction piece, the results showed that the stress field and temperature field has a significant influence on each other, indicated that between them there is a clear relationship between the couple.

413 非対称加熱を受ける傾斜機能中空半球の3次元非定常熱応力解析(材料・設計(3))

413 非対称加熱を受ける傾斜機能中空半球の3次元非定常熱応力解析(材料・設計(3))

Control of the transient thermoelastic displacement of a functionally graded rectangular plate bonded to a piezoelectric plate due to nonuniform heating

In this study, the theoretical analysis of a control of the transient thermoelastic displacement is developed for a functionally graded rectangular plate bonded to a piezoelectric plate due to nonuniform heat supply. Assuming that the functionally graded plate has nonhomogeneous thermal and mechanical material properties in the thickness direction, the three-dimensional temperature in a transient state and the three-dimensional transient thermal stresses of a simply supported plate for a functionally graded material are analyzed by introducing the theory of laminated composites as a theoretical approximation. By using the solution for a functionally graded plate and the exact solution for a piezoelectric plate of crystal class mm2, the theoretical analysis of three-dimensional transient piezothermoelasticity is developed for a simply supported combined plate. the analysis of a piezothermoelastic problem leads to an appropriate electric potential applied to the piezoelectric plate which suppresses the induced thermoelastic displacement in the thickness direction at the midpoint on the free surface of the functionally graded plate. As an example, numerical calculations are carried out for a functionally graded rectangular plate made of zirconium oxide and titanium alloy, bonded to a piezoelectric plate of a cadmium selenide solid. Some numerical results when the transient thermoelastic displacements are controlled are shown in figures.

Three-dimensional transient piezothermoelasticity in functionally graded rectangular plate bonded to a piezoelectric plate

In this study, the theoretical analysis of a three-dimensional transient piezothermoelasticity problem is developed for a functionally graded rectangular plate bonded to a piezoelectric plate due to partial heat supply. In this analysis, temperature distribution has a dependence on time, while the inertia term is ignored. Assuming the functionally graded rectangular plate has nonhomogeneous thermal and mechanical material properties in the thickness direction, the three-dimensional temperature in a transient state and three-dimensional transient thermal stresses of a simple supported plate for functionally graded material are analyzed by introducing the theory of laminated composites as a theoretical approximation. By using the solution for a functionally graded plate and the exact solution for piezoelectric plate of crystal class mm2, the theoretical analysis of three-dimensional transient piezothermoelasticity is developed for a simply supported combined plate. As an example, numerical calculations are carried out for a functionally graded rectangular plate made of zirconium oxide and titanium alloy, bonded to a piezoelectric plate of a cadmium selenide solid. Some numerical results for the temperature change, the displacement, the stress, electric potential, and electric displacement distributions in a transient state are shown in figures.

THREE-DIMENSIONAL TRANSIENT THERMAL STRESSES OF FUNCTIONALLY GRADED RECTANGULAR PLATE DUE TO PARTIAL HEATING

In this study, the theoretical analysis of a three-dimensional thermal stress problem is developed for a functionally graded rectangular plate due to a partial heat supply in a transient state. Assuming the functionally graded rectangular plate has nonhomoge neous thermal and mechanical material properties in the thickness direction, the three-dimensional temperature in a transient state and three-dimensional transient thermal stresses in a simple supported plate for functionally graded material are analyzed by introducing the theory of laminated composites as one of theoretical approximation. As an example, numerical calculations are carried out for a functionally graded rectangular plate made of zirconium oxide and titanium alloy. Some numerical results for the temperature change, the displacement, and the stress distributions are shown in figures.

Three-Dimensional Transient Thermal Stresses of a Cross-Ply Laminated Rectangular Plate due to Partial Heating.

In this study, the theoretical analysis of a three-dimensional thermal stress problem is developed for a multilayered anisotropic laminated plate due to partially heat supply in a transient state. As an analytical model, we consider a laminated rectangular plate consisting of an orthogonal pile of layers having orthotropic material properties, i.e. a cross-ply laminate. We obtain the exact solutions for the three-dimensional temperature change in a transient state and three-dimensional transient thermal stresses of a simple supported plate. As an example, numerical calculations are carried out for a 3-layered cross-ply laminate, and some numerical results for the temperature change, the displacement and the stress distributions are shown in figures.

THREE-DIMENSIONAL TRANSIENT THERMAL STRESS ANALYSIS OF A NONHOMOGENEOUS HOLLOW CIRCULAR CYLINDER DUE TO A MOVING HEAT SOURCE IN THE AXIAL DIRECTION

In this paper, a theoretical analysis of a three-dimensional transient thermal stress problem is developed for a nonhomogeneous hollow circular cylinder due to a moving heat source in the axial direction from the inner and /or outer surfaces. Assuming that the hollow circular cylinder has nonhomogeneous thermal and mechanical material properties in the radial direction, the heat conduction problem and the associated thermoelastic behaviors for such nonhomogeneous medium are developed by introducing the theory of laminated composites as one of theoretical approximation. The transient heat conduction problem is treated with the help of the methods of Fourier cosine transformation and Laplace transformation, and the associated thermoelastic field is analyzed making use of the thermoelastic displacement potential, Michell's function, and the Boussinesq's function. Some numerical results for the temperature change and the stress distributions are shown in figures, and the effect of relaxing the thermal stress ...

Three-Dimensional Transient Thermal Stress Analysis of a Nonhomogeneous Hollow Sphere with Respect to Rotating Heat Source.

In this study, the theoretical analysis of a three-dimensional transient thermal stress problem is developed for a nonhomogeneous hollow sphere with respect to rotating heat source from the outer surface. We assume that the hollow sphere has nonhomogeneous thermal and mechanical material propeties is the radial direction. The heat conduction problem and the associated thermoelastic behavior for such nonhomogeneous media are developed by introducing the theory of laminated composites as one theoretical approximation. The transient heat conduction problem is evaluated with the aid of the method of Laplace transformation. The associated thermoelastic field is analyzed by making use of the thermoelastic displacement potential and the complementary harmonic function. Some numerical results for the temperature change and the stress distributions are shown in figures.

Three-Dimensional Transient Thermal Stress Analysis of a Nonhomogeneous Hollow Circular Cylinder with respect to Rotating Heat Source.

In this paper, theoretical analysis of a three-dimensional transient thermal stress problem is developed for a nonhomogeneous hollow circular cylinder with respect to rotating heat source from the inner and/or outer surface. We assume that the hollow circular cylinder has nonhomogeneous thermal and mechanical material properties in the radial direction. The heat conduction problem and the associated thermoelastic behavior for such nonhomogeneous media are developed by introducing the theory of laminated composites as one theoretical approximation. The transient heat conduction problem is evaluated with the aid of the methods of Fourier cosine transform and Laplace transform. The associated thermoelastic field is analyzed by making use of the thermoelastic displacement potential, Michell's function and the Boussinesq function. Some numerical results for the temperature change and the stress distributions are shown in figures.

Three-Dimensional Transient Thermal Stress Analysis of Nonhomogeneous Hollow Circular Cylinder.

In this paper, theoretical analysis of a three-dimensional transient thermal stress problem is developed for a nonhomogeneous hollow circular cylinder. We assume that the hollow circular cylinder has nonhomogeneous thermal and mechanical material properties in the radial direction. The heat conduction problem and the associated thermoelastic behavior for such a nonhomogeneous medium are developed by introducing the theory of laminated composites as one of the theoretical approximations. The transient heat conduction problem under the condition of three-dimensional heat supply due to the inner or outer surrounding medium is evaluated with the aid of the methods of Fourier cosine transform and Laplace transform. The associated thermoelastic field is analyzed by making use of the thermoelastic displacement potential, Michell's function and Boussinesq's function. Thereafter, the numerical results for the temperature change and the stress distributions are shown in the figures, and the influence of the nonhomogeneous material properties is briefly discussed.

Thermal shock resistance of laminated ceramic matrix composites

The thermal shock resistance capability of laminated ceramic matrix composites is investigated through the study of three-dimensional transient thermal stresses and laminate failure mechanisms. A (−45°/45°)s SiC/borosilicate glass laminate is utilized as a reference composite system to demonstrate the analytical results. The maximum allowable temperature change, ΔT max, has been taken as a measure of the thermal shock resistance capability of composites. The effects of fibre orientation, volume fraction, thermal expansion coefficient. Young's modulus, and thermal conductivity on the thermal shock resistance capability, expressed in terms of the maximum allowable temperature change, ΔT max, have been assessed. Numerical computations are also performed for six composite systems.

Transient Thermal Stresses Due to a Local Source of Heat Moving Back and Forth Over the Surface of an Infinite Slab

A solution is given for three-dimensional transient thermal stresses due to a local source of heat that moves back and forth with a constant angular velocity over the surface of an infinite elastic slab. The transient temperature distribution is obtained by means of the complex Fourier and Laplace transforms, and the associated thermal stresses are obtained by making use of the thermoelastic displacement function and the Galerkin function.

Transient thermal stresses due to a local source of heat moving back and forth over the surface of an infinite slab.

A solution is given for three-dimensional transient thermal stresses due to a local source of heat that moves back and forth with a constant angular velocity over the surface of an infinite elastic slab. The temperature distribution is obtained by means of the Fourier and Laplace transforms, and the associated thermal stresses are obtained by making use of the thermoelastic displacement function and the Galerkin function. Graphical representations of the solution in i\dimensionless terms are included in this paper.

Three-dimensional transient thermal stresses of reactor graphite subjected to internal heat generation and asymmetric surface heating

The present paper is concerned with three-dimensional transient thermal stresses of graphite in a nuclear reactor. In analyzing this problem, reactor graphite may be approximated by a transversely isotropic finite circular cylinder subjected to internal heat generation and asymmetric heating on an end surface. Thermal stresses are analyzed by means of the transversely isotropic potential functions method proposed by Takeuti and Noda. Numerical calculations were carried out for a special type of heating conditions, and time variations of temperature and thermal stresses of graphite are shown in figures.

A three-dimensional treatment of transient thermal stresses in a transversely isotropic semi-infinite circular cylinder subjected to an asymmetric temperature on the cylindrical surface

This paper deals with a three-dimensional transient thermal stress problem in a transversely isotropic semi-infinite circular cylinder subjected to an asymmetrical temperature on the cylindrical surface and a convective heat loss on the surfaces. In analyzing the problem, the generalized Fourier transform to a temperature and the modified transversely isotropic potential functions method to stresses are used. For the numerical example, the temperature and the thermal stresses are calculated for a grafite which belongs under a transverse isotropy, and compared with the values under isotropic conditions. The effects of the various anisotropies of the material properties on the temperature and the thermal stresses are studied.

Transient thermal stress in a transversely isotropic finite circular cylinder under eccentric partial heating on an end surface.

The present paper is concerned with the three-dimensional transient thermal stress problem in a transversely isotropic finite circular cylinder subjected to an eccentric partial heat source on an end surface, and the convective heat losses into the surrounding medium from the surfaces. This problem is analyzed by means of the transversely isotropic potential function method to stresses. For numerical examples, the temperature and thermal stresses were calculated for a graphite which belongs under a transverse isotropy and compared with those of isotropy. The effects of the length of the circular cylinder on the temperature and thermal stresses were researched.

Transient thermal stresses in a transversely isotropic semi infinite circular cylinder with an asymmetric temperature distribution on the end surface and a convective heat loss

In this paper, the three-dimensional transient thermal stress problem in a transversely isotropic semi-infinite circular cylinder subjected to an asymmetric temperature distribution on the end surface and convective heat losses into the surrounding medium from the surfaces is analyzed by means of the modified transversely isotropic potential function method.

Three-Dimensional Transient Thermal Stresses in a Finite Hollow Circular Cylinder Due to Partially Distributed Moving Heat Sources

Three-Dimensional Transient Thermal Stresses in a Finite Hollow Circular Cylinder Due to Partially Distributed Moving Heat Sources