Damage identification in welded structures using symmetric excitation of Lamb waves

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.

A modified hyperbola based baseline free approach using Lamb wave mode conversion for detection of multiple structural damages: a simulation based study

“…Eight noded linear brick elements (C3D8R) of length 1.5 mm was used to discretize the plate and stiffeners. The element length was taken to be one-tenth of the wavelength of a transverse wave in the plate [7]. Lead Zirconate Titanate PZT-5H was used for actuation and sensing the lamb wave response and material properties are shown in table 1.…”

“…Dynamic implicit analysis with free-free boundaries was used for this study. Time increment for analysis was chosen as per CFL (Courant, Friedrichs, and Lewy) criteria and found to be 25 μs [7].…”

“…Delay-And-Sum (DAS), ellipse based method, direct arrival, hyperbola based method, time reversal method and probability based methods, etc are among the various methods widely used by researchers for damage detection in plates from Lamb wave propagation data [4][5][6][7][8][9][10][11][12]. In the DAS method, differential signals across various sensor-actuator paths are shifted according to their time-of-flight (TOF).…”

Research on Pipeline Damage Imaging Technology Based on Ultrasonic Guided Waves

“…e method adopted in this paper is to use a piezoelectric sensor array to excite the ultrasonic guided wave signal and to analyse the di erence between the excitation signal and the echo signal to realize the positioning of the structural defects in the pipeline. Meanwhile, based on the ellipse localization imaging method of plate structure [18], the method is proposed and applied for the axial localization and damage imaging method which is suitable for both single and double defects of pipe segment.…”

Double Crack Damage Identification of Welded Steel Structure Based on LAMB WAVES of S0 Mode

“…Through some experimental and theoretical investigations, Lamb waves have been proved to be suitable for locating an approximate sizing of structural damages [8]. He et al [9] used the finite element method to simulate the propagation of Lamb waves. The location of crack damage is simulated by the amplitude addition method.…”