Nonlinear acoustics for fatigue crack detection - experimental investigations of vibro-acoustic wave modulations

被引:186
|
作者
Klepka, A. [1 ]
Staszewski, W. J. [1 ,2 ]
Jenal, R. B. [2 ]
Szwedo, M. [1 ]
Iwaniec, J. [1 ]
Uhl, T. [1 ]
机构
[1] AGH Univ Sci & Technol, Dept Robot & Mechatron, Krakow, Poland
[2] Univ Sheffield, Dynam Res Grp, Dept Mech Engn, Sheffield S10 2TN, S Yorkshire, England
来源
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL | 2012年 / 11卷 / 02期
关键词
crack detection; fatigue cracks; nonlinear acoustics; vibro-acoustic wave modulations; nonlinear mechanisms; DISCERN MATERIAL DAMAGE; NEWS TECHNIQUES; SPECTROSCOPY; PROPAGATION; ELASTICITY; MECHANISM;
D O I
10.1177/1475921711414236
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Vibro-acoustic nonlinear wave modulations are investigated experimentally in a cracked aluminum plate. The focus is on the effect of low-frequency vibration excitation on modulation intensity and associated nonlinear wave interaction mechanisms. The study reveals that energy dissipation - not opening-closing crack action - is the major mechanism behind nonlinear modulations. The consequence is that relatively weak strain fields can be used for crack detection in metallic structures. A clear link between modulations and thermo-elastic coupling is also demonstrated, providing experimental evidence for the recently proposed non-classical, nonlinear vibro-acoustic wave interaction mechanism.
引用
收藏
页码:197 / 211
页数:15
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