Abstract
Damage monitoring systems based on Lamb wave health monitoring technology have attracted considerable attention for scientific research and industrial applications. In this article, two types of single-mode Lamb waves are obtained using symmetric and anti-symmetric methods, respectively, to determine a crack identification signal. A numerical simulation of a welded steel plate model was conducted using the ABAQUS/EXPLICIT module, which is a dynamic solver. The propagation process and the corresponding effect of the Lamb waves over the complete and damaged models are simulated. According to the propagation characteristics and with the assistance of the ellipse localization method with MATLAB, the location of crack damage is simulated by the amplitude addition method and the crack damage location is determined. The results show that the simulation results are in good agreement with the actual crack damage. Furthermore, the received signals are compared and analyzed from an energy perspective. Two types of single-mode Lamb wave monitoring methods are also compared. In addition, it is demonstrated that a symmetric excitation can simplify the received waves and recognize crack damage in plates in welded steel structures from an experimental perspective of this work.
Highlights
Engineering structures undergo gradual deterioration over time as the result of static and dynamic loading, temperature, humidity, wind, and corrosive factors
Yu and Ou2 introduced structural health monitoring (SHM), which is an improved approach over traditional Non-destructive testing (NDT)
Active acoustic emission (AE) monitoring technology based on Lamb waves has been applied to monitor structures composed of metal and composite materials (Alamdari et al.,[5] Rucka and Wilde,[6] Katunin,[7] Katunin and Holewik,[8] and Yu et al.9)
Summary
Engineering structures undergo gradual deterioration over time as the result of static and dynamic loading, temperature, humidity, wind, and corrosive factors. When a particular Lamb wave is excited in a plate structure, the group velocity can be obtained by the dispersion curve. According to the characteristics of the particle vibrations caused by the Lamb wave in the plate, one of the modal waveforms can be eliminated using a double PZT sensor to excite both sides of the sensor simultaneously to obtain a single-mode Lamb wave. Assuming that the wave velocity of Lamb wave signal is unchanged before and after the damage, d is the distance between the two PZTs, and the time delay can be obtained as v0Dt + d = r1 + r2. The oscilloscope has four channels, one of which is selected as the reference channel for the excitation signal, and with the other three channels simultaneously displaying the received waveform and saving the data
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