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Mode conversion behavior of SH guided wave in a tapered plate

机译：SH导波在锥板中的模式转换行为

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摘要

The present study explores mode conversion of shear horizontal (SH) guided wave when it impinges on smooth defects in plates. The fundamental (SH0) and the first higher (SH1) modes were selectively generated by an electromagnetic acoustic transducer in aluminum plates and the propagating modes at various points were detected by a pinducer. The defects had a flat bottom region and tapered edges. Remaining thickness at the bottom defected region was smaller than the so-called cut-off thickness of SH1 mode. Both modes exhibited unique mode conversion behaviors in tapered edge, which were interpreted with the dispersion relation. Total reflection of SH1 mode was also observed at a specific condition. Numerical simulation revealed that the continuous wavenumber change in the tapered region and the consequent zero value at cut-off thickness cause this total reflection.
机译：本研究探讨了剪切水平（SH）导波撞击板中光滑缺陷时的模式转换。基本模式（SH0）和第一个较高的（SH1）模式是由铝板上的电磁换能器有选择地生成的，而在各个点上的传播模式则由插针检测。缺陷具有平坦的底部区域和锥形边缘。底部缺陷区域的剩余厚度小于所谓的SH1模式的截止厚度。两种模式在锥形边缘都表现出独特的模式转换行为，这可以通过色散关系来解释。在特定条件下也观察到SH1模式的全反射。数值模拟表明，在锥形区域中连续波数变化以及在截止厚度处的零值导致了这种全反射。

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  • 来源
    《NDT & E international》 |2012年第1期|p.156-161|共6页
  • 作者

    Nurmalia; N. Nakamura; H. Ogi; M. Hirao; K. Nakahata;

  • 作者单位

    Graduate School of Engineering Science, Osaka University, 1-3 Machinakeyama Toyonaka, Osaka 560-8531, Japan;

    Graduate School of Engineering Science, Osaka University, 1-3 Machinakeyama Toyonaka, Osaka 560-8531, Japan;

    Graduate School of Engineering Science, Osaka University, 1-3 Machinakeyama Toyonaka, Osaka 560-8531, Japan;

    Graduate School of Engineering Science, Osaka University, 1-3 Machinakeyama Toyonaka, Osaka 560-8531, Japan;

    Department of Civil and Environmental Engineering, Ehime University, Bunkyo-cho 3 Matsuyama, Ehime 790-8577, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    SH guided wave; mode conversion; wavenumber change; EMAT;

    机译：SH导波;模式转换;波数变化EMAT;

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