Conclusions
From an analysis of the above results for ζ=1 we can conclude the following:
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1.
The initial stresses have a substantial effect on the phase velocities of the generated waves.
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2.
There are frequencies at which the relative phase velocity is independent of the initial stresses.
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3.
Each mode has a frequency range in which the variation of the phase velocity caused by the initial stresses is strongly dependent on the frequency.
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4.
As the ratio of layer thicknesses varies, there is also a variation both in the critical frequencies and in the nature of the dependence of the phase velocity on the frequency and on the initial stresses.
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Additional information
Institute of Mechanics, Academy of Sciences of the Ukrainian SSR, Kiev. Kiev Scientific-Research Institute for Microinstruments. Translated from Prikladnaya Mekhanika, Vol. 20, No. 7, pp. 3–10, July, 1984.
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Guz', A.N., Sitenok, N.A. & Zhuk, A.P. Axially symmetric elastic waves in a laminated compressible composite material with initial stresses. Soviet Applied Mechanics 20, 589–596 (1984). https://doi.org/10.1007/BF00891714
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DOI: https://doi.org/10.1007/BF00891714