Abstract
The technique for measurement of the group velocity of guided waves was proposed. The technique is based on the spectrum decomposition method and was investigated in the case of A0 and S0 modes of Lamb waves propagating in CFRP composite plate. The obtained measurement results were compared with the theoretical dispersion curves obtained by SAFE method.DOI: http://dx.doi.org/10.5755/j01.eee.19.2.3470
Highlights
At recent time the composite materials are used in various transport areas such as aviation and aerospace, boats and yachts or buses
The application of the guided waves for inspection of the composite materials is very attractive as they are sensitive to variation of elastic properties or different type of defects
The phase and the group velocities of guided waves usually are different and depend essentially on frequency. This phenomenon is called dispersion and it is characterized by phase and group velocities dispersion curves
Summary
At recent time the composite materials are used in various transport areas such as aviation and aerospace, boats and yachts or buses They are used in other industrial structures, such as wind turbines, towers and etc. The phase and the group velocities of guided waves usually are different and depend essentially on frequency. This phenomenon is called dispersion and it is characterized by phase and group velocities dispersion curves. The spectrum decomposition technique was already used for investigation of ultrasonic signals propagating in attenuating media [3] and for estimation of phase velocity [4]. The objective of this work was to investigate performance of the proposed group velocity measurement technique in the case of composite materials
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