Computers, Materials & Continua DOI:10.32604/cmc.2022.019711 | |

Article |

Magneto-Thermoelasticity with Thermal Shock Considering Two Temperatures and LS Model

1Department of Mathematics and Statistics, College of Science, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia

2Mathematics Department, Faculty of Science, South Valley University, Qena, 83523, Egypt

3Computer Science Department, Faculty of Computers and Information, Luxor University, Luxor, Egypt

4Mathematics Department, Faculty of Science, Cairo University, Egypt

5Mathematics Department, Faculty of Science, Sohag University, Egypt

*Corresponding Author: A. M. Abd-Alla. Email: mohmrr@yahoo.com

Received: 23 April 2021; Accepted: 18 June 2021

Abstract: The present investigation is intended to demonstrate the magnetic field, relaxation time, hydrostatic initial stress, and two temperature on the thermal shock problem. The governing equations are formulated in the context of Lord-Shulman theory with the presence of bodily force, two temperatures, thermal shock, and hydrostatic initial stress. We obtained the exact solution using the normal mode technique with appropriate boundary conditions. The field quantities are calculated analytically and displayed graphically under thermal shock problem with effect of external parameters respect to space coordinates. The results obtained are agreeing with the previous results obtained by others when the new parameters vanish. The results indicate that the effect of magnetic field and initial stress on the conductor temperature, thermodynamic temperature, displacement and stress are quite pronounced. In order to illustrate and verify the analytical development, the numerical results of temperature, displacement and stress are carried out and computer simulated results are presented graphically. This study helpful in the development of piezoelectric devices.

Keywords: Thermoelastic; thermal shock; initial stress; two temperatures; magnetic field; relaxation time

Recently, more attentions have been considered by researchers and engineers to the thermoelasticity theory to release the confliction of infinite speed due to the thermal signals, because of the importance in diverse fields as geophysics, acoustics, engineers, plasma physics, and industries. Biot [1] is the prior who presented the classical coupled thermoelasticity theory due to the coupled interaction between the thermal field and strain. The generalized thermoelasticity models have been introduced by Lord et al. [2] considering one relaxation time. Chen et al. [3] and Chen et al. [4,5] investigated the theory of heat conduction depending on two temperatures. Youssef [6] investigated the theory of two-temperature generalized thermoelasticity. Green et al. [7] who inserted two relaxation times and advocating finite wave speed thermal in solids by correcting the energy equation and Neuman-Duhamel relation or modifying Fourier’s conduction heat equation. Chandrasekharaiah et al. [8] studied the thermoelastic interactions without energy dissipation due to a point heat source. Chandrasekharaiah et al. [9] studied the temperature-rate-dependent thermo-elastic interactions due to a line heat source. The magnetoelastic earth’s material nature may affect on the wave propagation, especially surface waves. A literature review of the earliest contributions to the subject has been discussed in details by Puri [10]. Nayfeh et al. [11] who studied the plane wave propagation under the electromagnetic field in a solid medium. Choudhuri et al. [12] discussed the rotation effect on magneto-thermoelastic media in an elastic medium. Ezzat et al. [13] investigated the electromagneto-thermoelastic plane waves with two relaxation times in a medium of perfect conductivity Ezzat et al. [14] studied the electromagneto-thermoelastic plane waves with thermal relaxation in a medium of perfect conductivity. Zhuang et al. [15] studied the explicit phase field method for brittle dynamic fracture. Rabczuk et al. [16] investigated the nonlocal operator method for partial differential equations with application to the electromagnetic waveguide problem. Bahar et al. [17] introduced the formulation of state space in thermoelastic problems which also developed in Sherief [18] including the heat sources effectively. Sherief et al. [19] studied the two dimensional generalized thermoelasticity problem for an infinitely long cylinder. Youssef et al. [20] analysis a generalized thermoelastic infinite layer problem with the state space approach considering three models. Formulation of state space for the vibration of gold nano-beam in femtoseconds scale pointed out by Elsibai et al. [21]. Biot [22] clears that under stress free state would be fundamentally different from initial stresses states acoustic propagation and obtained the longitudinal and transverse wave velocities along the coordinate axes only. Chattopadhyay et al. [23] explained the plane wave reflection and refraction in an unbounded medium under initial stresses. Montanaro [24] studied the linear thermoelasticity problem with hydrostatic initial stress. Othman et al. [25] studied the reflection waves in a generalized thermoelastic medium from a free surface under hydrostatic initial stress under different thermoelastic theories. Youssef [26] studied the problem of generalized thermoelastic infinite medium with a cylindrical cavity subjected to a ramp-type heating and loads.

The main purpose of the present investigation is intended to demonstrate the magnetic field, relaxation time, hydrostatic initial stress, and two temperature on the thermal shock problem. The governing equations are formulated in the context of Lord-Shulman theory with the presence of body force, two temperatures, thermal shock, and hydrostatic initial stress. We obtained the exact solution using the normal mode technique with appropriate boundary conditions. The field quantities are calculated analytically and displayed graphically under thermal shock problem with effect of external parameters respect to space coordinates.

Considering that the medium is a perfect electric conductor and the absence of the displacement current (SI) [10], the linearized Maxwell equations governing the electromagnetic field as the form as shown in Fig. 1

in which

The equation of heat conduction given [15] as

The stress–displacement relations for the isotropic material are

The Maxwell’s equation formulated as

The motion equation splits to

The heat conduction and dynamical heat related by the form

The non-dimensional variables for simplifying gives as

where

By dropping the dashed for convenience, and substitute Eq. (10), then Eqs. (2) and (9) take the following form

where

Assuming the scalar and vector potential functions

By using (15) and (10) in Eqs. (7) and (8), we obtain.

where

Also Eq. (11) tends to

The solution of the previous physical variables can be decomposed in terms of normal mode technique in the exponential harmonic form

where

Using Eq. (17), into Eqs. (12) and (14)–(16), we obtain

where

Solving Eqs. (18)–(20) by eliminating

where

Similarly, we get

which can be factorized to

where

as

Similarly

The solution of Eq. (21) has the form

To get the amplitudes of the displacements u and v, which bounded as

where

From Eqs. (28)–(30) into Eqs. (18)–(20), we get

where

Thus

Substitution of Eqs. (35) and (36) into Eqs. (3)–(5), we obtain

where

The normal mode analysis is, in fact, to look for the solution in Fourier transformed domain. Assuming that all the field quantities are sufficiently smooth on the real line such that normal mode analysis of these functions exists.

Now we will obtain the parameters

Boundary conditions for the thermal at surface under thermal shock

Boundary condition for the mechanic at surface under initial stress

Boundary condition for the mechanic at the surface is traction free

Substitute into the above boundary conditions in the physical quantities, we obtain

In the context of the boundary conditions in Eqs. (56)–(58) at the surface

5 Numerical Results and Discussions

To illustrate the analytical variable obtained earlier, we will consider a numerical example consider copper material. The results display the variation of displacements, temperature and stress in the context of LS theory.

We took the constants:

The output is plotted in Figs. 2–7.

Fig. 2 displays the values of the conductive temperature

Fig. 3 plots the values of the thermodynamic temperature

Fig. 4 shows the values of displacement

Fig. 5 displays the value of displacement v which has an oscillatory behavior in the whole range of axial x under the effects of time

Fig. 6 clears the values of stress,

Fig. 7 shows the values of the stress

The results and conclusions can be summarized as follows

1)Normal mode analysis of the problem of magneto-thermoelastic solid has been applied and developed.

2)The generalized magneto-thermoelasticity with thermal shock, two temperatures, initial stress described with characteristic by fourth order equation.

3)The role of the initial stress, thermal shock, magnetic field clears strongly on the physical quantities depending on the nature of the medium, horizontal and vertical distances x and y respectively. The nature of forced applied as well as the type of boundary conditions deformation.

4)Finally, it is concluded that all the external parameters affect strongly on the physical quantities of the phenomenon which has more applications, especially, in engineering, geophysics, astronomy, acoustics, industry, structure, and other related topics.

Acknowledgement: Taif University Researchers Supporting Project Number (TURSP-2020/164), Taif University, Taif, Saudi Arabia.

Funding Statement: The authors received no specific funding for this study.

Conflicts of Interest: The authors declare that they have no conflicts of interest to report regarding the present study.

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