Journal: Sensors (Basel, Switzerland)

Article Title: Structural Fatigue Life Monitoring with Piezoelectric-Based Sensors: Fundamentals, Current Advances, and Future Directions

doi: 10.3390/s25020334

Figure Lengend Snippet: Detailed and categorized descriptions of the research in the field of FLM using UT waves and AE.

Article Snippet: H. Mei et al. [ ] , 2019 , UT/AE , E , Aluminum plate , - EDS and SEM analysis were conducted to obtain chemical compositions and visualize the microstructure. - Time–space Lamb wave data were obtained from the SLDV line scan, and the experimental frequency–wavenumber dispersion curves were obtained. - An SLDV area scan was conducted to measure the wave interaction with the corrosion damage under PWAS excitation. - Experimental tuning curves showed that the S0 mode was dominant around the 330 kHz frequency in the 0° direction, while SH0 mode was also observed as strong as S0 mode in the 45° direction due to the anisotropic behavior of the composite plate. - The pitch–catch mode showed that both S0 and SH0 were dominant in the sensing path, in agreement with the experimental tuning curves. , - The circular PZT with a diameter of 7 mm and a thickness of 0.2 mm was used. - PWAS was studied for detecting damage in isotropic plates, particularly on aluminum plates using circular and long PWAS. - A simulated corrosion damage was made on the aluminum plate to study damage detection using the active sensing method. - Lamb waves were generated in the aluminum plate under electrical excitation, and mode conversion and scattered waves were picked up by a Polytec PSV-400-M2 SLDV. - A network of PWAS sensors and damage imaging methods were used to detect and quantify delamination. - Signals were collected using pulse–echo and pitch–catch modes. - The direction-dependent group velocities of the incident and scattered waves for all the individual sensing paths on the composite plate were determined using the semi-analytical finite element analysis. - Based on the TOF of scattered SH0 waves, the imaging method was able to detect and quantify the delamination in the plate..

Techniques: Dispersion, Comparison, Generated, Imaging