摘要:

The general solution of the displacement boundary value problem is obtained for an infinite plate with an arbitrary shaped hole under uniform heat flux in any direction. The complex stress functions, the dislocation method, and a rational mapping function are used and the closed solution is obtained. An infinite plate with a circular hole and a slit is analyzed under the condition of the constrained displacements. The singularity at the tip of the slit of the constrained displacement is investigated

ISSN:0149-5739    

DOI:10.1080/01495738908961955

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The problem of determining the stress state in a plate subjected to a thermal transient is often encountered in engineering practice. Available solutions are limited to special cases and are not easy to use. The aim of this work is to provide a simple tool for stress and strain calculations due to piecewise linear variation of ambient temperature. A variational approach is applied to obtain approximate temperature and stress distributions within the plate in a simple analytic form. Stress diagrams derived from the exact temperature distribution are used to assess the accuracy of the method. The method is finally used to determine the magnitude of thermal stresses induced by thermal cycling. The results are shown to be in agreement with those of previous studies

ISSN:0149-5739    

DOI:10.1080/01495738908961956

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

In this paper, the employment of the method of caustics for evaluation of the stress intensity factors (SIFs) in transient thermal loadings is demonstrated. There are few methods to evaluate SIFs for those loadings. Analytic and numerical methods are still unable to provide sufficient accuracy within a reasonable effort for real-life problems. Experimental methods, such as photoelasticity, moire, and caustics are excellent alternatives. The caustics method is the easiest one to use, since it requires relatively simple equipment to produce and record the caustic pattern. The method is based on the deflection of light rays due to stress gradients in a crack tip under load, producing a shadow optical image— the caustic curve. Experiments include sudden application of uniform heating to a rectangular specimen with a crack perpendicular to one edge, and repeating the same procedure with two different clad materials on the cracked edge. Results indicate the meaningful influence of the clad material on the specimen behavior, and stand in good comparison with other methods

ISSN:0149-5739    

DOI:10.1080/01495738908961957

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The effect of a radial steady-state temperature gradient on elastic-plastic expansion of a hollow sphere or a spherical cavity in an infinite medium is investigated for homogeneous, isotropic, incompressible, temperature-dependent elastic-plastic strain hardening material. By employing appropriate temperature-dependent elastic and plastic strain hardening laws based on experimental data, the solutions for spherical inflation problems can be obtained in terms of elementary functions

ISSN:0149-5739    

DOI:10.1080/01495738908961958

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

This paper considers the crack problem for a relatively thin layer bonded to a very thick substrate under “ thermal shock” conditions. The effect of surface cooling rate is studied by assuming the temperature boundary condition to be a ramp function. Among the crack geometries considerd are the edge crack in the coating layer, the broken layer, the edge crack going through the interface, the undercoat crack in the substrate and the embedded crack crossing the interface. The primary calculated quantity is the stress intensity factor at various singular points; the main variables are the relative sizes and locations of cracks, the time, and the duration of the cooling ramp. The problem is solved and results are given for a stainless steel layer welded on a ferritic medium and a ceramic coating on a steel substrate

ISSN:0149-5739    

DOI:10.1080/01495738908961959

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

This paper deals with a contact problem in infinitely long, elastic layered media that are subjected to periodic moving frictional loads on the upper surface. The general analytic solutions of temperature and stress distributions are obtained by means of the Laplace and Fourier transforms. A numerical inversion technique is utilized to solve the general solution for the case of uniform pressure distribution. Results of the transient stresses and temperature distribution are presented. The effect of different material properties on the stresses and temperature distribution are also studied. Young' s modulus ratio and the thermal conductivity ratio are found to play an important role on thermal stress distribution

ISSN:0149-5739    

DOI:10.1080/01495738908961960

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Analytic solutions for sandwich panels subjected to temperature changes are obtained, taking into account the effects of finite bounding stiffnesses. The numerical results show that the bonding stiffness, up to a certain level, has a strong effect on the panel response. The answer to what constitutes “ perfect” bonding is best answered in terms of the ratio of the core stiffness to the bonding stiffness, rather on the individual constituent material. A heat chamber is designed and used to test sandwich specimens under different temperature changes. The experimental values for normal stresses in the skins are in a good agreement with the present theory

ISSN:0149-5739    

DOI:10.1080/01495738908961961

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

This paper is concerned with uniqueness and reciprocity both for quasistatic and dynamic thermopiezoelectncity

ISSN:0149-5739    

DOI:10.1080/01495738908961962

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The paper is concerned with the linear theory of thermoviscoelasticity established by M. E. Gurtin. Some theorems concerning the reciprocity relation, the variational characterization of the solution, and uniqueness are presented. A continuous dependence result is also established

ISSN:0149-5739    

DOI:10.1080/01495738908961963

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The dynamic response of homogeneous, orthotropic plates having two parallel, simply supported edges and exposed to rapid surface heating is examined. Uncoupled, thin-plate theory is used to determine the inducedflexural vibrations. The solution is obtained as the superposition of two displacement fields, representing the quasi-static and the dynamic behaviors. An exact Levy-type solution is derived for the quasi-static problem. For the dynamic case, the governing partial differential equation is first reduced to a system of ordinary differential equations in time by means of the Galerkin method. For special situations in which the latter equations are uncoupled (e.g., plates having all edges simply supported), the solution is obtained using the Laplace transform. For cases involving more general support conditions, the equations are integrated numerically using the Runge-Kutta-Gill technique. Numerical results are presented for both isotropic and orthotropic plates having various combinations of edge conditions

ISSN:0149-5739    

DOI:10.1080/01495738908961964

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor