Preprint Article Version 1 This version is not peer-reviewed

On the Directivity of Lamb Waves Generated by Wedge PZT Actuator in Thin CFRP Panel

Version 1 : Received: 19 December 2019 / Approved: 21 December 2019 / Online: 21 December 2019 (10:40:28 CET)
Version 2 : Received: 7 February 2020 / Approved: 10 February 2020 / Online: 10 February 2020 (10:29:43 CET)

A peer-reviewed article of this Preprint also exists.

Shevtsov, S.; Chebanenko, V.; Shevtsova, M.; Chang, S.-H.; Kirillova, E.; Rozhkov, E. On the Directivity of Lamb Waves Generated by Wedge PZT Actuator in Thin CFRP Panel. Materials 2020, 13, 907. Shevtsov, S.; Chebanenko, V.; Shevtsova, M.; Chang, S.-H.; Kirillova, E.; Rozhkov, E. On the Directivity of Lamb Waves Generated by Wedge PZT Actuator in Thin CFRP Panel. Materials 2020, 13, 907.

Journal reference: Materials 2020, 13, 907
DOI: 10.3390/ma13040907

Abstract

This paper addresses investigation of guided-wave excitation by angle-beam wedge piezoelectric transducers in multi-layered composite plate structure with orthotropic symmetry of the material. The aim of present study is to determine the capability of such actuators to provide the controlled generation of acoustic wave of desirable type with the necessary wavelength, propagation distance and directivity. The studied CFRP panel is considered as homogenous with effective elastic moduli and anisotropic structural damping, whose parameters were determined experimentally. According to the results of dispersion analysis and taking into account the data of wave attenuation in a highly damping CFRP composite, two types of propagating waves A0 and S0 were considered theoretically and experimentally in the frequency range 10 - 100 kHz. Using the results of a previous study, the structure of the wedge actuator was reconstructed to develop its finite element (FE) model, and a modal analysis was carried out, which revealed the most intense natural vibration modes and their eigenfrequencies within the used frequency range. Both experimental and numerical studies of the generation, propagation, directivity and attenuation of waves in the orthotropic composite panel under study revealed the influence of the angular orientation of the actuator on the formation of wave patterns and allowed to determine the capabilities of the wave's directivity control.

Subject Areas

acoustic based SHM; orthotropic polymeric composites; Lamb waves; horizontally polarized SH waves; angle-beam wedge transducer; waves directivity

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