Lamb-wave propagation in laminated composite plates
Various approximate theories have been proposed to model low-frequency Lamb-wave propagation in composite laminates. In this study, an approximate solution was derived from an elementary shear-deformation plate theory. A simple method, similar in configuration to the acousto-ultrasonic technique, was used to measure Lamb-wave phase velocities. Low-frequency Lamb waves, usually in the range of 10 kHz to 1 MHz, were generated. Dispersion curves of the lowest symmetric Lamb mode and the lowest antisymmetric Lamb mode were obtained. The experimental data were compared with the results obtained from the approximate solution for the lowest Lamb modes in the low-frequency, long-wavelength region for a unidirectional laminate, a symmetric cross-ply laminate, a symmetric quasi-isotropic laminate and an aluminum plate. There is good correlation between the data and the results obtained from the approximate solution, which suggests that the lowest Lamb modes are modeled adequately by the present theory. This experimental procedure of measuring phase velocities can be used to characterize laminated composite plates with and without damage.
- Research Organization:
- Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (USA)
- OSTI ID:
- 7007943
- Country of Publication:
- United States
- Language:
- English
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