Abstract
A new mathematical model of generalized magneto-thermo-viscoelasticity theories with memory-dependent derivatives (MDD) of dual-phase-lag heat conduction law is developed. The equations for one-dimensional problems including heat sources are cast into matrix form using the state space and Laplace transform techniques. The resulting formulation is applied to a problem for the whole space with a plane distribution of heat sources. It is also applied to a perfect conducting semi-space problem with a traction-free surface and plane distribution of heat sources located inside the medium. The inversion of the Laplace transforms is carried out using a numerical approach. Numerical results for the temperature, displacement, stress and heat flux distributions as well as the induced magnetic and electric fields are given and illustrated graphically. A comparison is made with the results obtained in the coupled theory. The impacts of the MDD heat transfer parameter and Alfven velocity on a viscoelastic material, for example, poly (methyl methacrylate) (Perspex) are discussed.
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Abbreviations
- t :
-
Time
- \( \varvec{x} \) :
-
Space coordinates
- \( u_{i} \) :
-
Components of displacement vector
- \( q_{i} \) :
-
Components of heat flux
- \( e_{ij} \) :
-
Components of strain tensor
- C o :
-
\( \sqrt {\frac{\lambda \, + \,\;2\,\mu }{\rho }} \), Speed of propagation of isothermal elastic waves
- \( K_{o} \) :
-
\( \lambda \; + (2/3)\,\mu \), bulk modulus
- \( C_{E} \) :
-
Specific heat at constant strain
- \( \sigma_{o} \) :
-
The electrical conductivity
- \( \varvec{H} \) :
-
Magnetic intensity vector
- \( \varvec{E} \) :
-
Electric intensity vector
- \( \mu_{o} \) :
-
Magnetic permeability
- \( \varepsilon_{o} \) :
-
Electric permeability
- \( \varvec{B} \) :
-
\( \mu_{o} \varvec{H}, \), magnetic induction vector
- J :
-
Conduction current density vector
- \( e \) :
-
Dilatation
- \( k \) :
-
Thermal conductivity
- \( T \) :
-
Absolute thermodynamic temperature
- \( T_{ \circ } \) :
-
Reference temperature
- \( \vartheta \) :
-
\( T - T_{o} \); \( \left| {\,\frac{\vartheta }{{T_{o} }}} \right| \ll 1 \)
- \( \gamma \) :
-
\( (3\lambda + 2\mu )\alpha_{T} \)
- \( \delta (.) \) :
-
Dirac delta function
- \( \delta_{ij} \) :
-
Kronecker’s delta
- \( \varepsilon \) :
-
Thermal coupling parameter
- \( \varepsilon_{ij} \) :
-
Components of strain tensor
- \( \sigma_{ij} \) :
-
Components of stress tensor
- \( S_{ij} \) :
-
Components of stress deviator tensor
- \( \lambda ,\;\mu \) :
-
Lame’ constants
- \( \rho \) :
-
Mass Density
- \( \eta_{o} \) :
-
\( \frac{{\rho \,C_{E} }}{k} \)
- \( \varepsilon \) :
-
\( \frac{{ \, \gamma^{2} T_{o} }}{{k\eta_{o} \rho C_{o}^{2} }} \), Thermal coupling parameter
- \( \alpha_{o} \) :
-
\( \sqrt {\frac{{\mu_{o} \,H_{o}^{2} }}{\rho }} \), Alfven velocity
- \( \tau \) :
-
Relaxation time
- \( \tau_{q} ,\tau_{\theta } \) :
-
Phase-lags
- \( {\varGamma (}\text{.)} \) :
-
Gamma function
- Q :
-
Strength of applied heat source per unit mass
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Acknowledgements
The authors gratefully acknowledge the approval and the support of this research study by the Grant No. SCI-2017-1-8-F-7322 from the Deanship of Scientific Research in Northern Border University, Arar, KSA.
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Aldawody, D.A., Hendy, M.H. & Ezzat, M.A. On dual-phase-lag magneto-thermo-viscoelasticity theory with memory-dependent derivative. Microsyst Technol 25, 2915–2929 (2019). https://doi.org/10.1007/s00542-018-4194-6
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DOI: https://doi.org/10.1007/s00542-018-4194-6