Modeling lamb wave propagation in visco-elastic composite plates using a fifth-order plate theory.

Ultrasonics
Adil Han OrtaKoen Van Den Abeele

Abstract

A new extension of the shear deformation theory to fifth order in order to calculate the spectrum of Lamb waves in orthotropic media over a wide frequency range is developed and analyzed. The aspiration of the proposed method is to create an alternative framework to exhaustive 3D elasticity based solutions by increasing computational efficiency without losing accuracy, nor robustness. A new computational framework is introduced which allows to estimate the dispersion curves for the first nine symmetric and nine anti-symmetric Lamb modes. Analytically calculated dispersion curves using 5-SDT for different propagation directions and polar plots for selected frequency of different materials are compared with the results from both the semi analytical finite element method, and lower order shear deformation theories. Careful analysis for individual laminae and for symmetric composite laminates exhibits a good agreement between the new higher order plate theory and the semi analytical finite element method over an extensive frequency range. In addition, attenuation plots show that the proposed method can also be used for visco-elastic materials (or highly damped materials). The advantage of the new higher order plate theory and its n...Continue Reading

References

Sep 24, 2002·The Journal of the Acoustical Society of America·S I Rokhlin, L Wang
May 20, 2014·Ultrasonics·Takahiro Hayashi, Daisuke Inoue

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