Study on Measurement of Group Velocity of Lamb Waves in Shape Memory Alloy Sheets

Abstract:

This paper describes the nondestructive evaluation of microstructure using laser-excited Lamb waves to detect the phase transformation in NiTi shape memory alloy sheets. Lamb waves were applied in the NiTi sheet using a pulse laser beam. Piezoelectricity transducers were used to receive the Lamb waves, the group velocities of which were measured using a time-frequency analysis method at different temperatures. Results show that a marked variation in the group velocity occurs during the phase transformation in the NiTi alloy. The dependence of group velocity on temperature provides a effective means of inspecting microstructure transformation in NiTi alloys.

• Periodical: Advanced Materials Research (Volumes 1065-1069)
• Pages: 2021-2024
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1065-1069.2021
• Online since: December 2014
• Authors: Kai Sheng Wang*, Wei Chun Zhang
• Keywords: Group Velocity, Lamb Waves, Laser Ultrasonic, Microstructure, Shape Memory Alloy (SMA), Short-Time Fourier Transform

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