文献类型：期刊文献

英文题名：Design of Waveguide Bars for Transmitting a Pure Shear Horizontal Wave to Monitor High Temperature Components

作者：Jia, Jiuhong[1];Wang, Qiyue[1];Liao, Zuoyu[1];Tu, Yun[1];Tu, Shan-Tung[1]

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

年份：2017

卷号：10

期号：9

外文期刊名：MATERIALS

收录：;EI(收录号：20173604137299);WOS:【SCI-EXPANDED(收录号:WOS:000411506700043)】；

基金：The authors are grateful for the support provided by Shanghai Pujiang Program (No. 15PJD010), National Natural Science Foundation of China (No. 51505150), Natural Science Foundation of Shanghai (No. 15ZR1409100) and the 111 project under the contract No. B13020.

语种：英文

外文关键词：high temperature; waveguide bar; design; non-dispersion; structural health monitoring; ultrasonic guided waves; piezoelectric transducers

摘要：Guided wave technique could be a possible method for monitoring components working in high temperature above 350 degrees C. However, this would require the design of an appropriate waveguide bar to transmit the wave, so that its sensing part is not influenced by the high temperature. In the present study, the shape of waveguide bars is designed based on the analysis of wave source characteristics. The critical frequency-width and frequency-thickness products of waveguide bars are analyzed theoretically and numerically to transmit the zeroth shear horizontal wave SH0* in bars. The results show that waveguide bars can cut off all the other wave modes when their frequency-thickness products are smaller than the critical value fd*,and frequency-width products are not smaller than the critical value fw*. Six waveguide bars are designed and fabricated based on the design criteria, and an experiment system is set up to check their work performance. The testing results indicate that the wave signals of the SH0* mode propagate clearly in waveguide bars, and cut off all the other modes when the frequency-thickness products and frequency-width products of the bars meet the design criteria. It is also demonstrated that the dependency of the experimental group velocity of each waveguide bar on frequency is in good agreement with the numerical result. High-temperature experiments also validate the reliability of the designed waveguide bars. Therefore, the critical frequency-thickness product and frequency-width product can be the basis for the design of the waveguide bars.