Abstract
The vibration of a functionally graded axisymmetric nonlocal thermoelastic hollow sphere with dual-phase-lag effect is addressed in this paper. Surfaces of the sphere are assumed to be thermally insulated or isothermal and stress free. According to a simple power law, the material is assumed to be graded in the radial direction. The linear theory of modified thermoelasticity with a dual phase lag based on Eringen’s nonlocal elasticity is employed to model this problem. The Matrix Frobenius method of continued power series is introduced to derive the analytical solutions. The phase velocity relations for the existence of various modes of vibrations in the designed hollow sphere are derived in compact forms. In order to explore the attributes of vibrations, the fixed-point numerical iteration technique is used to solve the secular equations. The numerical computations for the material crust in respect of the natural frequencies, thermoelastic damping and the frequency shifting are presented graphically using MATLAB software tools.
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Abbreviations
- \(\sigma _{ij}\), \(e_{ij}\) and \(T_{0} \) :
-
Stress, strain components and reference temperature
- u(r, t) and T(r, t):
-
Displacement and temperature change
- \(\lambda \), \(\mu \), \(\rho \), K :
-
Lame’s, mass density, thermal conductivity parameters
- \(\alpha _{\mathrm{T}}\), \(C_{\mathrm{e}} \) :
-
Coefficient of linear thermal expansion, specific heat at constant strain
- \(t_{0}\), \(t_{1}\) :
-
Phase lag of the heat flux, phase lag of temperature gradient
- \(\beta =(3\lambda +2\mu )\alpha _{\mathrm{T}} \) :
-
Thermoelastic coupling constant
- \(\omega \), \(\omega ^{*} \), \(\Omega ^{*}\) :
-
Circular frequency of vibrations, thermoelastic characteristic frequency, characteristic frequency of vibrations
- \(\xi =ea\) :
-
Nonlocal elastic parameter, where a is internal characteristic length and e is a material constant.
- \(R_{\mathrm{I}}\) and \(R_{\mathrm{O}} =\hbar R_{\mathrm{I}} \) :
-
Inner radius and outer radius (\(\hbar \) is thickness of disk)
- \(\hbar =\frac{R_{\mathrm{O}} }{R_{\mathrm{I}} }\) :
-
Ratio of outer radius to inner radius
- \(\varepsilon _{\mathrm{T}} \) :
-
Thermoelastic coupling parameter
- \(c_{1}\), \(c_{2} \) :
-
Velocity of longitudinal wave, velocity of shear wave
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Sharma, D.K., Bachher, M., Manna, S. et al. Vibration analysis of functionally graded thermoelastic nonlocal sphere with dual-phase-lag effect. Acta Mech 231, 1765–1781 (2020). https://doi.org/10.1007/s00707-020-02612-y
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DOI: https://doi.org/10.1007/s00707-020-02612-y