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Proceedings Paper

Feasibility of using nonlinear guided waves to measure acoustic nonlinearity of aluminum
Author(s): Kathryn H. Matlack; Jin-Yeon Kim; Laurence J. Jacobs; Jianmin Qu
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Paper Abstract

This research investigates the feasibility of measuring acoustic nonlinearity in aluminum with different ultrasonic guided wave modes. Acoustic nonlinearity is manifested by generation of a second harmonic component in an originally monochromatic ultrasonic wave signal, and previous research has shown this correlates to an intrinsic material property. This parameter has been shown to increase with accumulated material damage - specifically in low- and high-cycle fatigue - prior to crack initiation, whereas other ultrasonic nondestructive evaluation (NDE) techniques measuring linear parameters are unable to detect damage prior to crack initiation. In structural components such as jet engines and aircraft structures subjected to fatigue damage, crack initiation does not occur until ~80% of a component's life. Thus, there is a need for structural health monitoring (SHM) techniques that can characterize material damage state prior to crack initiation, and therefore nonlinear ultrasonic techniques have the potential to be powerful NDE and SHM tools. Experimental results using Rayleigh and Lamb guided wave modes to measure acoustic nonlinearity in undamaged aluminum 6061 samples are presented, and a comparison of the efficiency of these modes to measure acoustic nonlinearity is given.

Paper Details

Date Published: 31 March 2011
PDF: 8 pages
Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 79840L (31 March 2011);
Show Author Affiliations
Kathryn H. Matlack, Georgia Institute of Technology (United States)
Jin-Yeon Kim, Georgia Institute of Technology (United States)
Laurence J. Jacobs, Georgia Institute of Technology (United States)
Jianmin Qu, Northwestern Univ. (United States)

Published in SPIE Proceedings Vol. 7984:
Health Monitoring of Structural and Biological Systems 2011
Tribikram Kundu, Editor(s)

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