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Proceedings Paper

Nonlinear ultrasonic fatigue crack detection using a single piezoelectric transducer
Author(s): Yun-Kyu An; Dong Jun Lee
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Paper Abstract

This paper proposes a new nonlinear ultrasonic technique for fatigue crack detection using a single piezoelectric transducer (PZT). The proposed technique identifies a fatigue crack using linear (α) and nonlinear (β) parameters obtained from only a single PZT mounted on a target structure. Based on the different physical characteristics of α and β, a fatigue crack-induced feature is able to be effectively isolated from the inherent nonlinearity of a target structure and data acquisition system. The proposed technique requires much simpler test setup and less processing costs than the existing nonlinear ultrasonic techniques, but fast and powerful. To validate the proposed technique, a real fatigue crack is created in an aluminum plate, and then false positive and negative tests are carried out under varying temperature conditions. The experimental results reveal that the fatigue crack is successfully detected, and no positive false alarm is indicated.

Paper Details

Date Published: 20 April 2016
PDF: 11 pages
Proc. SPIE 9803, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2016, 98032L (20 April 2016); doi: 10.1117/12.2218810
Show Author Affiliations
Yun-Kyu An, Sejong Univ. (Korea, Republic of)
Dong Jun Lee, Sejong Univ. (Korea, Republic of)


Published in SPIE Proceedings Vol. 9803:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2016
Jerome P. Lynch, Editor(s)

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