文献类型：会议论文

英文题名：Investigation on ultrasonic guided waves propagation in elbow pipe

作者：Qi, Minxin[1];Zhou, Shaoping[1];Ni, Jing[1];Li, Yong[1]

机构：[1]E China Univ Sci & Technol, Key Lab Pressure Syst & Safety MOE, Shanghai 200237, Peoples R China

会议论文集：14th International Conference on Pressure Vessel Technology (ICPVT)

会议日期：SEP 23-26, 2015

会议地点：Chinese Pressure Vessel Inst, Shanghai, PEOPLES R CHINA

主办单位：Chinese Pressure Vessel Inst

语种：英文

外文关键词：Guided wave; T (0,1) mode; Elbow; Axial crack; Excitation frequency

摘要：Pipeline plays an indispensable role in process industries, whose structural integrity is of great significance for the safe production. In this paper, the axial crack-like defects in 90 degrees elbows are inspected by using the T (0, 1) mode guided waves. The detection sensitivity for different defect locations is firstly investigated by guided waves experimentally. The propagation of guided waves in the bent pipe is then simulated by using finite element method. The results show that the rates of T (0, 1) mode passing through elbow correlate strongly with the excitation frequency. Less mode conversion is generated at the frequency of 38 kHz when passing through the elbow, while most of energy converted into F (1, 2) mode at the frequency of 75 kHz. The crack in different locations of the elbow can affect the rates of mode conversion. It can be found that the crack in the middle of the elbow inhibits mode conversion and shares the highest detection sensitivity, while the crack in the extrados of elbow causes more mode conversion. (C) 2016 Elsevier Ltd. All rights reserved.