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

页码：197 / 211

页数：15

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