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

• Published in: Materials Vol. 12; no. 11; p. 1800
• Main Authors: Hu, Muping, Sun, Xiaodan, He, Jian, Zhan, Yangyang
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 03.06.2019; MDPI
• Subjects: Acoustics; Computer simulation; Cracks; Damage detection; double structural damage identification; ellipse localization method; Finite element method; Imaging; Lamb waves; Localization; Mining machinery; Nondestructive testing; numerical simulation; Offshore platforms; Propagation; Seams; Signal processing; Steel plates; Steel structures; Velocity; Wave propagation; Wavelet transforms; weld damage identification; Lamb waves; ellipse localization method; weld damage identification; double structural damage identification; numerical simulation
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma12111800

Steel structures are widely used in large-span bridges, offshore platforms, mining equipment and other large-scale buildings. The damage of steel structures will cause significant safety risks in a project. Therefore, it is of great significance to identify and study damage to steel structures. In this study, the propagation of Lamb waves in a steel plate with double cracks is simulated. Using finite element analysis and experimental study, damage identification and damage imaging of double crack damage to a steel plate are performed, and the numerical simulation results are in good agreement with the experimental results. Considering the reflection and transmission of Lamb waves at the welding seam, the location and imaging of crack damage in a welded steel plate are also studied. The imaging results obtained from simulation and experiment show high level in accuracy. By comparing the amplitude of the signal in the propagation process, it is concluded that the transmission energy at the weld seam decreases.