Higher order nonlinear acoustics parameters for real-time damage assessment of metallic alloys using laser Doppler vibrometry

I. K. Tragazikis; T. Z. Kordatou; D. A. Exarchos; T. E. Matikas

doi:10.1117/12.2614990

18 April 2022 Higher order nonlinear acoustics parameters for real-time damage assessment of metallic alloys using laser Doppler vibrometry

I. K. Tragazikis, T. Z. Kordatou, D. A. Exarchos, T. E. Matikas

Author Affiliations +

Proceedings Volume 12047, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVI; 120471A (2022) https://doi.org/10.1117/12.2614990
Event: SPIE Smart Structures + Nondestructive Evaluation, 2022, Long Beach, California, United States

Abstract

The main purpose of this work is the development of a novel nondestructive and non-contact method based on nonlinear acousticsfor assessing the structural integrity of metallic alloys. This method enables real-time monitoring of the material’s degradation. The introduction of a sinusoidal ultrasonic wave, of given frequency and sufficient amplitude into an anharmonic solid, leads to the distortion of the propagating wave. This results to the generation of higher harmonics of the fundamental frequency. In comparison with linear ultrasonic parameters, such as velocity and attenuation, the measurement of the amplitude of these harmonics provides information on the coefficient of higher order terms of the stress strain for the nonlinear solid. A metallic alloy subjected to cyclic loading accumulates damage with time resulting to large changes of the material’s nonlinear parameters. This paper deals with monitoring the second and third harmonics of metallic alloy specimens during mechanical fatigue using Laser Doppler Vibrometry (LDV). Surface acoustic waves were used to induce a single frequency ultrasonic wave in the material for in-situ characterization of the fatigue damage. The LDV technique was able to resolve the third harmonic enabling to assess the third order nonlinear parameter in addition to the second one. It was shown that the third order nonlinear parameter provides a very sensitive measurement of minute microstructural changes due to fatigue.

Citation Download Citation

I. K. Tragazikis, T. Z. Kordatou, D. A. Exarchos, and T. E. Matikas "Higher order nonlinear acoustics parameters for real-time damage assessment of metallic alloys using laser Doppler vibrometry", Proc. SPIE 12047, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVI, 120471A (18 April 2022); https://doi.org/10.1117/12.2614990

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KEYWORDS

Acoustics

Doppler effect

Ultrasonics

Vibrometry

Nondestructive evaluation

Signal detection

Inspection

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