A comprehensive approach for wavefield-based characterization of ultrasonic shear wave scattering in plates

Angle-beam shear waves;Wavefield imaging;Ultrasonic scattering;Ultrasonic ray tracing;Ultrasonic signal processing;Nondestructive evaluation

Weng, Yu ; Michaels, Jennifer E. Electrical and Computer Engineering Lanterman, Aaron D. Zhang, Ying Sabra, Karim Ruzzene, Massimo ; Michaels, Jennifer E.

University:Georgia Institute of Technology

Department:Electrical and Computer Engineering

关键词: Angle-beam shear waves;    Wavefield imaging;    Ultrasonic scattering;    Ultrasonic ray tracing;    Ultrasonic signal processing;    Nondestructive evaluation;   

Others  :  https://smartech.gatech.edu/bitstream/1853/59885/1/WENG-DISSERTATION-2018.pdf

美国|英语

来源: SMARTech Repository

【 摘 要 】

The objective of this research is to present a comprehensive approach for characterizing and quantifying the scattering of angle-beam ultrasonic shear waves from a variety of scatterers in plates. The motivation behind analyzing angle-beam shear wave propagation and scattering is to obtain a better understanding of shear wave interactions with defects and improve the reliability and accuracy of inspection techniques for nondestructive evaluation. The scatterers investigated here include through-holes, part-through holes, and notches emanating from through-holes. Scattering from both through-holes and notches, aimed to mimic actual ultrasonic defects in practice, is of particular interest to the aerospace industry because crack-like defects usually grow from fastener holes, which presents a potential hazard to aircraft components if undetected. There are two main contributions of this research. One is the acquisition of a comprehensive set of wavefield data for a variety of scattering scenarios via wavefield imaging. The other is the development of a systematic methodology for ultrasonic shear wave scattering estimation using a complete set of signal processing techniques. All methodologies presented in this thesis are demonstrated to be effective and reliable for showing useful scattering information.