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Propagation of Lamb waves in transversely isotropic thermoelastic diffusive plate. (English) Zbl 1362.74020
Summary: The constitutive relations and field equations for anisotropic generalized thermoelastic diffusion are derived for a particular type of anisotropy, i.e. transverse isotropy. Green and Lindsay theory, in which, thermodiffusion and thermodiffusion-mechanical relaxations are governed by four different time constants, is selected for study. The propagation of plane harmonic thermoelastic diffusive waves in a homogeneous, transversely isotropic, elastic plate of finite width is studied, in the context of generalized theory of thermoelastic diffusion. According to the characteristic equation, three quasi-longitudinal waves, namely, quasi-elastodiffusive (QED-mode), quasi-massdiffusive (QMD-mode) and quasi-thermodiffusive (QTD-mode) can propagate in addition to quasi-transverse waves (QSV-mode) and the purely quasi-transverse motion (QSH-mode), which is not affected by thermal and diffusion vibrations, gets decoupled from the rest of the motion of wave propagation. The secular equations corresponding to the symmetric and skew symmetric modes of the plate are derived. The amplitudes of displacements, temperature change and concentration for symmetric and skew symmetric modes of vibration of plate are computed numerically. Anisotropy and diffusion effects on the phase velocity, attenuation coefficient and amplitudes of wave propagation are presented graphically in order to illustrate and compare the analytically results. Some special cases of frequency equation are also deduced from the existing results.

MSC:
74J15 Surface waves in solid mechanics
74F05 Thermal effects in solid mechanics
74E10 Anisotropy in solid mechanics
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