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research-article

Interaction between Circumferential Lamb Waves and Lamination in the Mid-plane of a Metallic Pipe

[+] Author and Article Information
Ziming Li

College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China
b201301lzm@emails.bjut.edu.cn

Cunfu He

College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China
hecunfu@bjut.edu.cn

Zenghua Liu

College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China
liuzenghua@bjut.edu.cn

Yan Lu

College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China
lvyan@bjut.edu.cn

Bin Wu

College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China
wubin62@163.com

1Corresponding author.

ASME doi:10.1115/1.4038309 History: Received February 22, 2017; Revised October 17, 2017

Abstract

Lamination is one of common defects in the manufacturing process of seamless metallic pipes. In this paper, the interaction between the circumferential Lamb waves and lamination in the mid-plane of an aluminum pipe is studied. The used circumferential Lamb waves are CL0 and CL1 modes generated with a finite element method code. Lamination along the circumferential direction is established by the demerging-node method. Numerical results of arrival time are compared with theoretical results in order to verify the accuracy of the excitation ways. The interaction between circumferential Lamb waves and lamination in a damaged full circular pipe is analyzed by composing the received waveforms of the corresponding receivers when CL0 and CL1 mode is excited at different excitation positions: the inner sub-pipe, the outer sub-pipe, and the main pipe. The composed waveforms fit well with the original waveforms. When CL0/CL1 mode reaches the entrance and exit of a lamination, it generates new mode and undergoes multiple reverberations, diffraction, and mode conversion between the two ends of the lamination. Based on the detailed analysis of the waveform in detail, some phenomena, which are different from those in a plate, are observed.

Copyright (c) 2017 by ASME
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