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复合管状结构中超声导波的位移分布
引用本文:他得安,刘镇清,贺鹏飞.复合管状结构中超声导波的位移分布[J].复合材料学报,2003,20(6):130-136.
作者姓名:他得安  刘镇清  贺鹏飞
作者单位:1. 复旦大学,电子工程系,上海,200433
2. 同济大学,声学研究所,上海,200092
3. 同济大学,工程力学系,上海,200092
基金项目:国家自然科学基金资助项目(10074050),上海市博士后科学基金资助项目
摘    要:对超声纵向导波在复合管状结构中的传播特性进行了分析。然后分析了系统中的位移分布,以此确定了各模式检测管材的最佳频厚积范围和检测的最佳位置。结果表明,各模式的径向和轴向位移在管内壁上的值较大,而在管壁中间和管外壁上的值较小;当频厚积增大到一特定值后,管壁中间和管外壁上的径向和轴向位移都近似为零,此特定值随模式阶次的提高而增加。选取各模式检测的频厚积时,应尽可能的选径向位移较小而轴向位移较大的频厚积点。

关 键 词:复合管材  纵向导波  位移分布  超声检测
文章编号:1000-3851(2003)06-0130-07
收稿时间:2002-08-05
修稿时间:2002年8月5日

DISPLACEMENT DISTRIBUTION OF LONGITUDINAL GUIDED WAVES IN COMPOSITE PIPES
TA Dean,LIU Zhenqing,HE Pengfei.DISPLACEMENT DISTRIBUTION OF LONGITUDINAL GUIDED WAVES IN COMPOSITE PIPES[J].Acta Materiae Compositae Sinica,2003,20(6):130-136.
Authors:TA Dean  LIU Zhenqing  HE Pengfei
Affiliation:1. Department of Electronic Engineering, Fudan University, Shanghai 200433, China; 2. Institute of Acoustics, Tongji University, Shanghai 200092, China; 3. Department of Engineering Mechanics, Tongji University, Shanghai 200092, China
Abstract:The propagation characteristic of ultrasonic longitudinal guided waves in composite pipes is investigated. The dispersion characteristics were computed on the assumption that the frequency is a real number and the wavenumber is a complex number. The displacement amplitude component distributions were analyzed in a two-layer system. The optimal location, optimal mode and its frequency-thickness products of testing were chosen by the displacement amplitude component distributions. The results show that the values of the radial and axial displacements of guided waves are larger at the inner wall than those at the middle and outer walls of a two-layer composite pipe. When frequency-thickness products increase to a certain value, which will increase with the increasing of the order of mode, the radial and axial displacements approach zero. It should be the choice of frequency-thickness products where there are smaller radial displacement and larger axial displacement in testing of guided wave modes.
Keywords:composite pipes  longitudinal guided waves  displacement distribution  ultrasonic    testing
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