Mode conversion behavior of SH guided wave in a tapered plate

被引：81

作者：

Nurmalia ^{[1
]}

Nakamura, N. ^{[1
]}

Ogi, H. ^{[1
]}

Hirao, M. ^{[1
]}

Nakahata, K. ^{[2
]}

机构：

[1] Osaka Univ, Grad Sch Engn Sci, Toyonaka, Osaka 5608531, Japan

[2] Ehime Univ, Dept Civil & Environm Engn, Matsuyama, Ehime 7908577, Japan

来源：

NDT & E INTERNATIONAL | 2012年 / 45卷 / 01期

关键词：

SH guided wave; Mode conversion; Wavenumber change; EMAT; SHEAR HORIZONTAL MODE; SCATTERING; PIPELINES; PROPAGATION; THICKNESS; DEFECTS; CRACK;

D O I：

10.1016/j.ndteint.2011.10.004

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

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. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：156 / 161

页数：6

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