摘要:

Hydrothermal stresses in a clay put in a high-speed drying furnace are discussed. This practical clay is treated as a hygrothermal elastic material that has a simple shape of an infinite body with a bored cylindrical hole. Thus, a theory of hygrothermoelasticity with uneven distributions of temperature and moisture concentration is used to find a closed-form hygrothermal hoop stress in such a body and to illustrate the solution graphically. For a clay put into a high-speed drying furnace, the effects of thermal expansion and drying contraction on the clay cracking are discussed in detail. In particular, it is shown that the effect of thermal expansion on cracking is much smaller (only a few percent) than that of drying contraction, even at high temperatures. As a result, the clay cracking under practical drying conditions would be caused by a drying stress concentration.

ISSN:0149-5739    

DOI:10.1080/01495739608946197

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

The problem in which two half-spaces make contact in a circular region and rotate about the common axis is considered. The contact pressure is assumed to be Hertzian, and a solution is given first for the transient temperature field and then for the corresponding thermal stresses. The effects of variation in space and time and the contact conditions are evaluated.

ISSN:0149-5739    

DOI:10.1080/01495739608946198

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

By means of elementary functions, the fundamental solution of equations of the thermoelasticity of the steady oscillations for a mixture of two elastic solids is constructed, and basic properties are established.

ISSN:0149-5739    

DOI:10.1080/01495739608946199

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

To investigate the flexural response of thermally induced (self-excited) bending vibrations of uniformly heated beams in still air, theoretical analyses were carried out considering the nonlinear dependence on the velocity of an unsteady component of the coefficient of heat transfer at the beam surface. Experiments both in air and in vacuum chamber were conducted. The stability boundary derived from the theoretical analysis was determined to be dependent on the phase difference between velocity fluctuations and thermal bending moments, the damping ratio, and a nondimensional parameter related to the heating rate. The experimental investigations showed that this type of thermally induced vibration occurs only in air and does not occur in a vacuum. Deflection responses of the beam were measured for various values of system parameters, and experimental stability boundaries were compared with theoretically predicted results. For long and narrow beams only first-mode bending vibration occurred, but under certain circumstances higher mode bending vibrations were also excited simultaneously on a relatively short beam.

ISSN:0149-5739    

DOI:10.1080/01495739608946200

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

The dynamic interaction of magneto-thermo-elastic waves in structural members of finite size is studied. Of special interest are the thermally induced small thickness vibrations in a planar conducting plate layer. To calculate the forced vibrations in the time domain, a modal expansion technique is proposed Therefore, the computation of the eigenvalues and eigenfunctions of the corresponding eigenvalue problem is the essential problem to be solved initially. In addition to a numerical evaluation of the algebraic eigenvalue equations, a perturbation analysis is presented to find the complex-valued eigensolutions of the problem for a weak coupling. In every case, the calculation of the forced vibrations is reduced to solving uncoupled ordinary differential equations. Finally, the complete thermally induced vibrations are represented by infinite series to be evaluated straightforwardly in a computer-aided form.

ISSN:0149-5739    

DOI:10.1080/01495739608946201

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor