摘要:

A thermoplastic deformation theory which is based on a proposed general yield criterion and associated flow rule is presented for fully saturated nonisothermal porous materials. The theory can be applied to prediction of stresses and strains in thermoconsolidation of many engineering materials, e.g., soils, concrete, ceramics, etc.

ISSN:0149-5739    

DOI:10.1080/01495738308942171

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

A quasi-state stress-field generated in an orthotropic elastic circular disk by a heat source rotating on a concentric circular path is investigated. An exact solution is developed in terms of doubly infinite series, using a stress-function approach. Numerical results are given for a boron-epoxy fiber-reinforced composite material and the effect of orthotropy on the distribution of thermal stresses is studied by comparing the orthotropic results with those for an isotropic material.

ISSN:0149-5739    

DOI:10.1080/01495738308942172

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The objectives are to determine the effects of internal reflections on the thermal stresses generated by radiation absorption in a semi-transparent flat plate, and to study the effect of varying the angle of incidence. Both suddenly applied and suddenly removed radiation from an established steady-state condition are considered.

ISSN:0149-5739    

DOI:10.1080/01495738308942173

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The temperature field in the coupled, dynamic theory of linear thermoelasticity for homogeneous and isotropic bodies satisfies a partial differential equation in which the temperature is the only unknown-the so-called temperature equation. Here, for certain classes of problems, appropriate boundary and initial conditions are derived for the temperature equation from the data for the corresponding mixed problem of thermoelasticity. It is shown that the resulting boundary-initial-value problem for the temperature has at most one solution. Furthermore, for these classes of problems, it is shown that a displacement field can be ex pressed directly in terms of the temperature field and that the corresponding thermoelastic process satisfies all of the conditions of the mixed thermoelasticity problem except for the tangential components of the mechanical boundary conditions. To this extent, our boundary-initial-value problem for the temperature uncouples the coupled theory.

ISSN:0149-5739    

DOI:10.1080/01495738308942174

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

In this paper, the high frequency induction heating apparatus developed by the authors to analyze thermal stresses by means of photoelastic experiment is described, and the accuracy of the apparatus is examined. The photoelastic experiment for the hollow disk with a concentric circular hole in steady-state temperature distribution under heating conditions in a vacuum of 50°and 0° on the inner and outer edges, respectively, is performed to confirm the reliability of the apparatus. For the purpose of the realization of the heating conditions, the cooling system that circulates the cooling medium is incorporated into the high frequency induction heating apparatus. The experimental and theoretical values are compared.

ISSN:0149-5739    

DOI:10.1080/01495738308942175

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

A linear theory of thermoelasticity for nonsimple materials is derived by using an entropy production inequality proposed by Green and Laws. A uniqueness theorem, complete solutions of the field equations, a study of the plane waves and fundamental solutions for steady vibrations are presented. A method to reduce the thermoelastostatic plane strain problem to an isothermal one is established. The thermal stress problem for an elastic space with a spherical cavity is also considered.

ISSN:0149-5739    

DOI:10.1080/01495738308942176

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

A new thick shell theory is proposed that accounts for shear and normal stress in the radial direction on one hand, expansion and warping of fibers normal to the mean surface on the other; it accurately describes the stress distribution in thick piping structures subjected to severe through-the-wall thermal gradients, e.g., in solar boiler tubes.

ISSN:0149-5739    

DOI:10.1080/01495738308942177

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The problems of linear thermoelasticity in a transversely isotropic hollow cylinder of finite length are solved by a direct power series approximation through the application of the Lanczos-Chebyshev method. Coefficients in the “economized” series are determined by collocation at selected Chebyshev points. Formulations are given to show that the same approach can be applied to all linear types of boundary conditions. A numerical example has been used for comparison with pubished solutions from a potential function approach, and with “long cylinder” solutions. The magnitude of end effects has been shown.

ISSN:0149-5739    

DOI:10.1080/01495738308942178

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0149-5739    

DOI:10.1080/01495738308942179

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

In this paper the transient thermal stress problem for an elastic strip with an edge crack is investigated. The elastic medium is assumed to be insulated on one face and cooled by surface convection on the face contaning the edge crack. Using the principle of superposition, the formulation results in a mixed boundary value problem, with the thermal stresses calculated from the thermoelasticity solution for an uncracked strip utilized as the necessary crack surface tractions. The resulting singular integral equation is of a well-known type and is solved numerically. In this paper, inertia effects are assumed negligible and possible temperature dependence of thermoelastic constants is not considered. The numerical results presented, include the stress intensity factor as a function of nondimensional time (Fourier number) and crack length, for various values of the dimensionless Biot number. The temperature distribution and the thermal stresses in the uncracked strip are also included. The time lag, which occurs between the time at which the stress on the surface of the strip is a maximum and the time when a maximum occurs in the stress intensity factor, is clearly shown to be a function of the Biot number for any given ratio of crack length to strip thickness. A result of particular interest is the degree with which the maximum stress intensity factor decreases, as a function of crack length, for decreasing values of the Biot number.

ISSN:0149-5739    

DOI:10.1080/01495738308942180

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor