A nonlinear acoustic technique for crack detection in metallic structures

D. Dutta; H. Sohn; K. Harries; P. Rizzo

doi:10.1117/12.776360

10 April 2008 A nonlinear acoustic technique for crack detection in metallic structures

D. Dutta, H. Sohn, K. Harries, P. Rizzo

Proceedings Volume 6935, Health Monitoring of Structural and Biological Systems 2008; 693511 (2008) https://doi.org/10.1117/12.776360
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2008, San Diego, California, United States

Abstract

A crack detection technique based on nonlinear acoustics is developed in this study. Acoustic waves at a chosen frequency are generated using an actuating lead zirconate titanate (PZT) transducer, and they travel through the target structure before being received by a sensing PZT wafer. Unlike an undamaged medium, a cracked medium exhibits high acoustic nonlinearity which is manifested as harmonics in the power spectrum of the received signal. Experimental results also indicate that the harmonic components increase non-linearly in magnitude with increasing amplitude of the input signal. The proposed technique identifies the presence of cracks by looking at the two aforementioned features: harmonics and their nonlinear relationship to the input amplitude. The effectiveness of the technique has been tested on aluminum and steel specimens. The behavior of these nonlinear features as crack propagates in the steel beam has also been studied.

Citation Download Citation

D. Dutta, H. Sohn, K. Harries, and P. Rizzo "A nonlinear acoustic technique for crack detection in metallic structures", Proc. SPIE 6935, Health Monitoring of Structural and Biological Systems 2008, 693511 (10 April 2008); https://doi.org/10.1117/12.776360

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