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Thermoelastic Models Of Continua

01 Jan 2016-
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Citations
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Journal ArticleDOI
TL;DR: In this paper, the authors used the Nunziato-Cowin theory of materials with voids to derive a theory of thermoelastic solids, which have a double porosity structure.
Abstract: In this article, we use the Nunziato–Cowin theory of materials with voids to derive a theory of thermoelastic solids, which have a double porosity structure. The new theory is not based on Darcy's law. In the case of equilibrium, in contrast with the classical theory of elastic materials with double porosity, the porosity structure of the body is influenced by the displacement field. We prove the uniqueness of solutions by means of the logarithmic convexity arguments as well as the instability of solutions whenever the internal energy is not positive definite. Later, we use semigroup arguments to prove the existence of solutions in the case that the internal energy is positive. The deformation of an elastic space with a spherical cavity is investigated.

105 citations

Journal ArticleDOI
TL;DR: In this paper, the propagation of time harmonic plane waves in an infinite nonlocal thermoelastic solid having void pores was studied, and the effects of frequency, void parameters, thermal parameter and nonlocality have been studied numerically on the phase speeds, attenuation coefficients and specific losses of all the propagating waves.
Abstract: This work is concerned with the propagation of time harmonic plane waves in an infinite nonlocal thermoelastic solid having void pores. Three sets of coupled dilatational waves and an independent transverse wave may travel with distinct speeds in the medium. All these waves are found to be dispersive in nature, but the coupled dilatational waves are attenuating, while transverse wave is nonattenuating. Coupled dilatational waves are found to be influenced by the presence of voids, thermal field and elastic nonlocal parameter. While the transverse wave is found to be influenced by the nonlocal parameter, but independent of void and thermal parameters. For a particular model, the effects of frequency, void parameters, thermal parameter and nonlocality have been studied numerically on the phase speeds, attenuation coefficients and specific losses of all the propagating waves. All the computed results obtained have been depicted graphically and explained.

68 citations


Cites background from "Thermoelastic Models Of Continua"

  • ...The theory of thermoelastic solid with void pores developed by Iesan [37] is a nice extension of the Classical Coupled Thermoelasticity theory....

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  • ...Note that in Iesan [37] theory of thermoelastic materials with voids, he did not account the term corresponding to the time rate of /, while this term appears in Cowin and Nunzaito theory [28]....

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  • ...Iesan [46] further extended his earlier theory to include viscoelastic effect and presented constitutive relations and equations for linear theory of thermoviscoelastic material with voids....

    [...]

  • ...Following Iesan [37] and Challamel et al. [16], the nonlocal generalization of Cattaneo type heat conduction law for thermoelastic material with voids is postulated as 1 e2r2ð Þ qþ s0 _qð Þ ¼ Krh; (5) where q is the heat flux vector, s0 is the relaxation time parameter and K is the thermal conductivity....

    [...]

  • ...A large number of important research works based on Iesan’s model of thermoelasticity with voids have been done by many researchers....

    [...]

Journal ArticleDOI
TL;DR: Fractional derivative is a widely accepted theory to describe the physical phenomena and the processes with memory responses which is defined in the form of convolution having kernels as power functions as mentioned in this paper.
Abstract: Fractional derivative is a widely accepted theory to describe the physical phenomena and the processes with memory responses which is defined in the form of convolution having kernels as power func...

32 citations


Cites background from "Thermoelastic Models Of Continua"

  • ...Natural phenomena, which are described by power law distributions apparently include the intensities of earthquake, size of power outages (Clauset, Shalizi, and Newman 2009)....

    [...]

  • ...Iesan (1986, 2004, 2011) studied the problem of linear theory of thermoelastic materials with voids and proved the uniqueness, reciprocal and variational theorems....

    [...]

  • ...Natural phenomena, which are described by power law distributions apparently include the intensities of earthquake, size of power outages (Clauset, Shalizi, and Newman 2009). Other engineering applications are in Biology, Physics, and Social Sciences. The huge appearance of power-law distributions in several real-life problems is one powerful reason to modify the laws of fractional calculus in several engineering fields. Recently, Sur et al. (2019a) have studied the thermoelastic interaction in a fiber-reinforced hollow cylinder due to thermal shock....

    [...]

  • ...Iesan (1986, 2004, 2011) proposed the field equations and the constitutive equations for generalized thermoelastic solid with voids as rij ¼ 2lij þ ½kekk þ bU bh dij; (9) hi ¼ aU;i; (10) g ¼ bekk nUþmh; (11) qT0g ¼ qcEhþ bekk þmU: (12) The energy equation for the linear theory of thermoelastic…...

    [...]

Journal ArticleDOI
TL;DR: In this article, the linear theory of viscoelasticity for Kelvin-Voigt materials with voids is considered and some basic results of the classical theory of elasticity are generalized.
Abstract: In the present paper the linear theory of viscoelasticity for Kelvin–Voigt materials with voids is considered and some basic results of the classical theory of elasticity are generalized. Indeed, the basic properties of plane harmonic waves are established. The explicit expression of fundamental solution of the system of equations of steady vibrations is constructed by means of elementary functions. The Green’s formulas in the considered theory are obtained. The uniqueness theorems of the internal and external basic boundary value problems (BVPs) are proved. The representation of Galerkin type solution is obtained and the completeness of this solution is established. The formulas of integral representations of Somigliana type of regular vector and regular (classical) solution are obtained. The Sommerfeld-Kupradze type radiation conditions are established. The basic properties of elastopotentials and singular integral operators are given. Finally, the existence theorems for classical solutions of the internal and external basic BVPs of steady vibrations are proved by using of the potential method (boundary integral method) and the theory of singular integral equations.

30 citations


Cites background from "Thermoelastic Models Of Continua"

  • ...An account of the historical developments of the theory of porous media as well as references to various contributions may be found in the books by de Boer [49] and Ieşan [50]....

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  • ...It is possible to investigate the basic BVPs in the linear theory of thermoelasticity for Kelvin–Voigt materials with voids (see, Ieşan [31]) by using potential method and the theory of singular integral equations....

    [...]

  • ...An account of the historical developments of the theory of porous media as well as references to various contributions may be found in the books by de Boer [49] and Ieşan [50]....

    [...]

  • ...In the absence of the body force and the extrinsic equilibrated body force, the system of homogeneous equations of motion in the linear theory of viscoelasticity for Kelvin–Voigt materials with voids has the following form (see, Ieşan [31]) μ u′ + (λ + μ)grad div u′ + b gradϕ′ − ρü′ + μ∗ u̇′ + (λ∗ + μ∗)grad div u̇′ + b∗ grad ϕ̇′ = 0, (2.1) (α − ξ)ϕ′ − b div u′ − ρ0ϕ̈′ + ( α∗ − ξ ∗)ϕ̇′ − ν∗ div u̇′ = 0, where u′ = (u′1, u′2, u′3) is the displacement vector, ϕ′ is the volume fraction field, ρ is the reference mass density (ρ > 0), ρ0 = ρκ, κ is the equilibrated inertia (κ > 0); λ,μ,b,α, ξ , λ∗,μ∗, b∗, α∗, ν∗, ξ ∗ are the constitutive coefficients, and a superposed dot denotes differentiation with respect to t : u̇′ = ∂u′ ∂t , ü′ = ∂2u′ ∂t2 ....

    [...]

  • ...Ieşan and Nappa [28] introduced a nonlinear theory of heat conducting mixtures where the individual components are modelled as Kelvin–Voigt viscoelastic materials....

    [...]

Journal ArticleDOI
TL;DR: In this article, the authors proved that the unique dissipation due to the microtemperatures is strong enough to exponentially stabilize the system if and only if the wave speeds of the system are equal.
Abstract: In this article, we investigate a porous-elastic system with dissipation due to only microtemperatures. It is well-known that such a system with a single damping term lacks exponential stability unless another damping mechanism is added. In this article, however, we prove that the unique dissipation due to the microtemperatures is strong enough to exponentially stabilize the system if and only if the wave speeds of the system are equal. In the case of lack of exponential stability, we show that the solution decays polynomially. Moreover, we show that this rate of decay is optimal. Our result is new and improves previous results in the literature.

26 citations

References
More filters
Journal ArticleDOI
TL;DR: In this paper, the authors used the Nunziato-Cowin theory of materials with voids to derive a theory of thermoelastic solids, which have a double porosity structure.
Abstract: In this article, we use the Nunziato–Cowin theory of materials with voids to derive a theory of thermoelastic solids, which have a double porosity structure. The new theory is not based on Darcy's law. In the case of equilibrium, in contrast with the classical theory of elastic materials with double porosity, the porosity structure of the body is influenced by the displacement field. We prove the uniqueness of solutions by means of the logarithmic convexity arguments as well as the instability of solutions whenever the internal energy is not positive definite. Later, we use semigroup arguments to prove the existence of solutions in the case that the internal energy is positive. The deformation of an elastic space with a spherical cavity is investigated.

105 citations

Journal ArticleDOI
TL;DR: In this paper, the propagation of time harmonic plane waves in an infinite nonlocal thermoelastic solid having void pores was studied, and the effects of frequency, void parameters, thermal parameter and nonlocality have been studied numerically on the phase speeds, attenuation coefficients and specific losses of all the propagating waves.
Abstract: This work is concerned with the propagation of time harmonic plane waves in an infinite nonlocal thermoelastic solid having void pores. Three sets of coupled dilatational waves and an independent transverse wave may travel with distinct speeds in the medium. All these waves are found to be dispersive in nature, but the coupled dilatational waves are attenuating, while transverse wave is nonattenuating. Coupled dilatational waves are found to be influenced by the presence of voids, thermal field and elastic nonlocal parameter. While the transverse wave is found to be influenced by the nonlocal parameter, but independent of void and thermal parameters. For a particular model, the effects of frequency, void parameters, thermal parameter and nonlocality have been studied numerically on the phase speeds, attenuation coefficients and specific losses of all the propagating waves. All the computed results obtained have been depicted graphically and explained.

68 citations

Journal ArticleDOI
TL;DR: Fractional derivative is a widely accepted theory to describe the physical phenomena and the processes with memory responses which is defined in the form of convolution having kernels as power functions as mentioned in this paper.
Abstract: Fractional derivative is a widely accepted theory to describe the physical phenomena and the processes with memory responses which is defined in the form of convolution having kernels as power func...

32 citations

Journal ArticleDOI
TL;DR: In this article, the linear theory of viscoelasticity for Kelvin-Voigt materials with voids is considered and some basic results of the classical theory of elasticity are generalized.
Abstract: In the present paper the linear theory of viscoelasticity for Kelvin–Voigt materials with voids is considered and some basic results of the classical theory of elasticity are generalized. Indeed, the basic properties of plane harmonic waves are established. The explicit expression of fundamental solution of the system of equations of steady vibrations is constructed by means of elementary functions. The Green’s formulas in the considered theory are obtained. The uniqueness theorems of the internal and external basic boundary value problems (BVPs) are proved. The representation of Galerkin type solution is obtained and the completeness of this solution is established. The formulas of integral representations of Somigliana type of regular vector and regular (classical) solution are obtained. The Sommerfeld-Kupradze type radiation conditions are established. The basic properties of elastopotentials and singular integral operators are given. Finally, the existence theorems for classical solutions of the internal and external basic BVPs of steady vibrations are proved by using of the potential method (boundary integral method) and the theory of singular integral equations.

30 citations

Journal ArticleDOI
TL;DR: In this article, the authors proved that the unique dissipation due to the microtemperatures is strong enough to exponentially stabilize the system if and only if the wave speeds of the system are equal.
Abstract: In this article, we investigate a porous-elastic system with dissipation due to only microtemperatures. It is well-known that such a system with a single damping term lacks exponential stability unless another damping mechanism is added. In this article, however, we prove that the unique dissipation due to the microtemperatures is strong enough to exponentially stabilize the system if and only if the wave speeds of the system are equal. In the case of lack of exponential stability, we show that the solution decays polynomially. Moreover, we show that this rate of decay is optimal. Our result is new and improves previous results in the literature.

26 citations