Research on the ultrasonic testing of defect for LY12 aluminum alloy based on transmission wave in lamb wave

• Main Authors: Xinya Chen, Zhen Chen
• Format: Article
• Language: English
• Published: JVE International 2017-05-01
• Series: Journal of Vibroengineering
• Subjects: ultrasonic testing; LY12 aluminum alloy; frequency dispersion curve; directive wave; transmission wave
• Online Access: https://www.jvejournals.com/article/17519

Aimed at the problem that the ultrasonic testing is applied in defect of LY12 aluminum alloy by using liquid or semi-solid coupling agent, transfer matrix method and gas-solid boundary conditions of ultrasonic wave propagation is used for establishing mathematic model in LY12 aluminum alloy, and this model is solved to obtain the propagation characteristic curve. When cut-off frequency is less than 2 MHz·mm, it has only S0 modal. The simulation result provides proper parameters for ultrasonic testing, in which the incidence angle is 30° and the center frequency is 1 MHz. The different circuit defect for LY12 aluminum alloy is made and detected, and time domain waveform is obtained. The experimental results show that the diameter of the defects has a little influence on the amplitude of the direct wave, defect wave amplitude decreases gradually with the increase of the defect diameter.