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Proceedings Article

Feasibility of using nonlinear guided waves to measure acoustic nonlinearity of aluminum

[+] Author Affiliations
Kathryn H. Matlack, Jin-Yeon Kim, Laurence J. Jacobs

Georgia Institute of Technology (USA)

Jianmin Qu

Northwestern Univ. (USA)

Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 79840L (March 31, 2011); doi:10.1117/12.880461
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From Conference Volume 7984

  • Health Monitoring of Structural and Biological Systems 2011
  • Tribikram Kundu
  • San Diego, California, USA | March 06, 2011

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.

© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Kathryn H. Matlack ; Jin-Yeon Kim ; Laurence J. Jacobs and Jianmin Qu
"Feasibility of using nonlinear guided waves to measure acoustic nonlinearity of aluminum", Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 79840L (March 31, 2011); doi:10.1117/12.880461; http://dx.doi.org/10.1117/12.880461


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