Instantaneous crack detection using dual PZT transducers

Seung Bum Kim; Hoon Sohn

doi:10.1117/12.775875

10 April 2008 Instantaneous crack detection using dual PZT transducers

Seung Bum Kim, Hoon Sohn

Proceedings Volume 6935, Health Monitoring of Structural and Biological Systems 2008; 693509 (2008) https://doi.org/10.1117/12.775875
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2008, San Diego, California, United States

Abstract

A new guided wave based nondestructive testing (NDT) technique is developed to detect crack damage in metallic plates commonly used in aircraft without using prior baseline data or a predetermined decision boundary. In conventional guided wave based techniques, damage is often identified by comparing the "current" data obtained from a potentially damaged condition of a structure with the "past" baseline data collected at the pristine condition of the structure. However, it has been reported that this type of pattern comparison with the baseline data can lead to increased false alarms due to its susceptibility to varying operational and environmental conditions of the structure. In order to tackle this issue, a reference-free damage detection technique is previously developed using two pairs of collocated lead zirconate titanate transducers (PZTs) placed on both sides of a plate. In this study, this reference-free technique is further advanced so that the PZT transducers can be placed only on one side of the specimen. Crack formation creates Lamb wave mode conversion due to a sudden change in the thickness of the structure. Then, the proposed technique instantly detects the appearance of the crack by extracting this mode conversion from the measured Lamb waves. This study suggests a reference-free statistical approach that enables damage classification using only the current data set. Numerical and experimental results are presented to demonstrate the applicability of the proposed technique to instantaneous crack detection.

Citation Download Citation

Seung Bum Kim and Hoon Sohn "Instantaneous crack detection using dual PZT transducers", Proc. SPIE 6935, Health Monitoring of Structural and Biological Systems 2008, 693509 (10 April 2008); https://doi.org/10.1117/12.775875

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