Crack characterization using guided circumferential waves

被引:67
|
作者
Valle, C [1 ]
Niethammer, M
Qu, JM
Jacobs, LJ
机构
[1] Univ Maine, Dept Engn Mech, Orono, ME 04469 USA
[2] Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA
[3] Georgia Inst Technol, George W Woodruff Sch Mech Engn, Atlanta, GA 30332 USA
来源
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA | 2001年 / 110卷 / 03期
关键词
D O I
10.1121/1.1385899
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
This paper examines the propagation of guided circumferential waves in a hollow isotropic cylinder that contains a crack, with the goal of using these guided waves to both locate and size the crack. The crack is sized using a modified Auld's formula, which relates the crack's length to a reflected energy coefficient. The crack is then located by operating on the backscattered signal with a time-frequency digital signal processing (DSP) technique, and then comparing these results to those obtained if the cylinder is perfect. The guided circumferential waves are generated with a commercial finite element method (FEM) code. One objective of this work is to demonstrate the effectiveness of using sophisticated DSP techniques to describe the effect of scattering on dispersive waves, showing it is possible to characterize cracks systematically and accurately by quantifying this scattering effect. The results show that the need for high frequency signals to detect small cracks is significantly decreased by using these techniques. (C) 2001 Acoustical Society of America.
引用
收藏
页码:1282 / 1290
页数:9
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