摘要:

For the optimized design of a brake drum, it appears to be very important to examine the transient temperature and thermal stress distributions in the brake drum. In the direct measurement, of them, however, a number of difficulties are involved In this study, in order to examine the initiation mechanism of the thermal crack in the brake drum, the temperature and thermal stress distributions in the brake drum in the course of their heating and cooling were investigated by using a two-dimensional axisymmetric Finite Element Method. The effect of a circumferential fin near the open end of the brake drum was also examined.

ISSN:0149-5739    

DOI:10.1080/01495739408946277

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

First we derive a nonlinear theory of thermoelastic dielectrics with voids. The treatment is based upon the dynamical theory of elastic dielectrics developed by Toupin and the theory of elastic materials with voids established by Nunziato and Cowin. Then we establish the equations of infinitesimal deformations and weak fields superimposed on a finite thermoelastic deformation and strong electromagnetic field.

ISSN:0149-5739    

DOI:10.1080/01495739408946278

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The fundamental matrix of the system of partial differential operators that governs the diffusion of heat and the strains in elastic media is represented by simple definite integrals and power series. For the elements of this matrix, the constant and the linear term in the Taylor series about 0 with respect to the coupling constant are expressed explicitly by error functions, elementary functions, and delta functions.

ISSN:0149-5739    

DOI:10.1080/01495739408946279

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

In this work the state-space formulation for two-dimensional problems of generalized thermoelasticity with one relaxation time is introduced. Laplace and Fourier integral transforms are used The resulting formulation is applied to a problem of a thick plate subject to heating that varies exponentially with time on parts of its upper and lower surfaces. The Fourier transforms are inverted analytically. A numerical method is employed for the inversion of the Laplace transforms. Numerical results are given and illustrated graphically for the problem considered.

ISSN:0149-5739    

DOI:10.1080/01495739408946280

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

This paper deals with the problem of an edge crack in a semi-infinite nonhomogeneous plate under steady heat flux loading conditions. The objective of the study is to assess the effect of material nonhomogeneity on the thermal stress intensity factor. All material properties are supposed to be exponentially dependent on the distance from the boundary of the plate. By using the Fourier transform, the problem is reduced to a singular integral equation that is solved numerically. The thermal stress intensity factors for various material constants are calculated. The results show that by selecting the material constants appropriately the stress intensity factor can be reduced.

ISSN:0149-5739    

DOI:10.1080/01495739408946281

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

In this study, mixed-mode stress intensity factors for cracked bodies subjected to thermal loadings are determined by using the thermal weight function method. The thermal weight function is a universal junction for a given cracked body and can be obtained from any arbitrary mechanical loading system. The thermal weight function may be thought of as the Green's junction for the stress intensity factor of cracked bodies subject to thermal loadings. Once the thermal weight function for a cracked body is determined, the stress intensity factor for any arbitrary distributed temperature can be simply and efficiently evaluated through the integration of the product of the temperature and the correspondent thermal weight function. A numerical boundary element method for the determination of thermal weight functions is used in this study to evaluate mixed-mode stress intensity factors. As a demonstration, some examples of cracked bodies subjected to thermal loadings are solved by using the thermal weight function method, and the results are compared with solutions obtained from other methods.

ISSN:0149-5739    

DOI:10.1080/01495739408946282

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Previous models of thermomechanically induced freezing front growth instability have assumed that the casting accumulates elastic strains as it solidifies. While this assumption is useful in providing insight into solidification thermomechanics, it fails to account for inelastic strains that normally accompany elevated temperature deformations. In this paper, growth instability during solidification of a pure metal is reexamined, assuming that the strain rate within the solidifying shell is the sum of elastic, thermal, and viscous components. This requires that a theoretical framework for plane strain thermoviscoelasticity be developed for a solidifying metal. The viscous component leads to strain rate relaxation within the casting and subsequently influences the evolution of the contact pressure and macromorphology of the freezing front. We define a strain rate relaxation parameter that determines the extent to which the casting deforms due to viscous creep. Both short-time and long-time solutions for the contact pressure are developed and subsequently examined for selected values of the strain rate relaxation parameter. The thermal and mechanical fields are assumed to be uncoupled along the metal /mold interface in the present paper while they are coupled along this interface in the companion paper.

ISSN:0149-5739    

DOI:10.1080/01495739408946283

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

ISSN:0149-5739    

DOI:10.1080/01495739408956401

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor