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

• Main Authors: Kumar, N. (Author), Kumar, S. (Author), Sunny, M.R (Author)
• Format: Article
• Language: English
• Published: Institute of Physics 2023
• Subjects: baseline free; Baseline free; Beamforming; Beam-forming; Corrosion; Damage detection; Guided electromagnetic wave propagation; guided waves; Lamb wave mode; modified hyperbola; Modified hyperbola; phased array beam forming; Phased array beam forming; Phased-arrays; piezoelectric; Piezoelectric; Plates (structural components); Stiffened plate; Structural damages; Structural health monitoring; Surface waves; Ultrasonic waves; Wave mode conversions
• Online Access: View Fulltext in Publisher

 Guided wave based techniques are among the promising techniques for structural health monitoring due to their ability to detect damage with high precision, ability to scan large area and low power consumption. However, practical implementation of these techniques to structures with relatively complex geometries such as stiffened plates demand further research due to several challenges. Some of such challenges include the presence of stiffeners and edges in close vicinity causing multiple reflections of waves, possibility of multiple damages and lack of baseline data. To address all these issues, a modified hyperbola based approach using mode converted signal and a data based matching scheme has been proposed in this paper. A stiffened plate is taken as the example structure. Corrosion like defects have been considered as the damages. Each panel of the stiffened plate has been scanned separately through phased array actuation. The effectiveness and robustness of the proposed approach have been shown through a case study using 3D finite element simulation data. © 2023 IOP Publishing Ltd.