Abstract
The present paper is aimed to make a detail analysis on the correct simulation of the associated natural thermal boundary conditions and their interesting effects on the thermally nonlinear generalized thermoelastic response of a continuum medium. The paper presents some explanations regarding the literally conventional thermal boundary conditions associated with Cattaneo’s heat conduction law. The importance of modeling the natural thermal boundary conditions is investigated by applying three practical thermal loads to a homogeneous one-dimensional layer. The results of the investigations are illustrated by propagation of thermoelastic waves through the layers. These results clearly show the profound effects of the correct statement of natural thermal boundary conditions on the thermoelastic response of the layer. It is shown that these effects intensify the importance of thermally nonlinear generalized thermoelastic analyses.
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Abbreviations
- \((\cdot ),_{p}\) :
-
Partial derivative with respect to p
- \((\cdot )^\mathsf {T}\) :
-
Transpose of a tensor
- : :
-
Double product symbol
- \(\bar{(\cdot )}\) :
-
Prescribed quantities on the boundary surfaces of continuum media
- \(\cdot \) :
-
Inner product symbol
- \(\dot{()}\) :
-
Material time derivative
- \(\hat{(\cdot )}\) :
-
Non-dimensional parameters
- \(\varTheta \) :
-
Difference between current and reference temperature
- \(\alpha \) :
-
Coefficient of thermal expansion
- \(\beta \) :
-
Thermoelastic coupling constant of isotropic materials
- \(\beta _{ij}\) :
-
Component of thermoelastic coupling tensor
- \(\pmb {\beta }\) :
-
Thermoelastic coupling tensor
- \(\lambda \) :
-
Normal Lamé constant
- \(\mu \) :
-
Shear Lamé constant
- \(\nabla \) :
-
Left nabla operator which produces left gradient and left divergence
- \(\mathrm{T_{\infty }}\) :
-
Absolute temperature of fluid interacting with thermoelastic solid
- \(\mathrm{T}\) :
-
Absolute temperature
- \(\mathrm t_{r}\) :
-
Rise time of thermal loads
- \(\mathsf {Tr}\) :
-
Trace of second-order tensors
- \(\rho \) :
-
Mass density
- \(\pmb {\sigma }\) :
-
Cauchy stress tensor
- \(\tau \) :
-
Relaxation time of heat flux vector
- \(\pmb {\varepsilon }\) :
-
Infinitesimal strain tensor
- \(\mathbf{b}\) :
-
Body force vector
- \(\mathrm{B_i}\) :
-
Coefficients of finite element equations
- \(\mathrm{C}_{\pmb {\varepsilon }}\) :
-
Specific heat
- \(\exp (\cdot )\) :
-
Natural exponential function
- \(\mathsf {F}(\cdot )\) :
-
Thermal loading function
- \(\mathsf {H}(\mathrm t)\) :
-
Heaviside function of time
- \(\mathrm{h}\) :
-
Convective heat transfer coefficient
- \(\mathbf{I}\) :
-
Identity tensor
- \(\mathrm {K}_{ij}\) :
-
Component of thermal conductivity tensor
- \(\mathbf{K}\) :
-
Thermal conductivity tensor
- \({\mathrm {K}}\) :
-
Thermal conductivity of isotropic continua
- \(\mathbf n\) :
-
Outward unit normal vector on the boundary surface of continuous medium
- \(\mathbf{N}^p\) :
-
Vector of shape functions associated with the variable p
- \(\mathscr {Q}\) :
-
Thermal power or total heat input
- \(\mathbf{q}\) :
-
Heat flux vector
- \(\mathrm{R}\) :
-
Volumetric heat source
- \(\mathrm{s}\) :
-
Specific entropy
- \(\mathrm{t}\) :
-
time parameter
- \(\mathbf{u}\) :
-
Displacement vector
- \(\mathbf{X}\) :
-
Global vector of nodal unknowns
- \(\mathbf{x}\) :
-
Position vector of the material points
- \(\mathbf{X}^p\) :
-
Vector of nodal unknowns associated with the variable p
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This paper is dedicated to the memory of Franz Ziegler
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Bateni, M., Eslami, M.R. Thermally nonlinear generalized thermoelasticity: a note on the thermal boundary conditions. Acta Mech 229, 807–826 (2018). https://doi.org/10.1007/s00707-017-2001-6
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DOI: https://doi.org/10.1007/s00707-017-2001-6