Detection of surface breaking fatigue crack on a complex aircraft structure with Rayleigh surface waves

Jeong K. Na; James L. Blackshire; Samuel J. Kuhr

doi:10.1117/12.815079

8 April 2009 Detection of surface breaking fatigue crack on a complex aircraft structure with Rayleigh surface waves

Jeong K. Na, James L. Blackshire, Samuel J. Kuhr

Proceedings Volume 7295, Health Monitoring of Structural and Biological Systems 2009; 72950G (2009) https://doi.org/10.1117/12.815079
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2009, San Diego, California, United States

Abstract

As part of an on-going, multi-year effort focused on developing a practical structural health monitoring (SHM) sensor for critical structural components in aircraft, a miniature Rayleigh surface wave sensor has been developed and tested. The sensor was specifically designed to detect localized, deterministic cracking in targeted locations in critical locations where fatigue cracking is prevalent. A representative aircraft component was used in the present investigation. Miniature interdigital transducers (IDTs) operating in the low megahertz frequency range were designed, fabricated, and tested on compact tension (CT) fatigue specimens in the laboratory before they were strategically placed on the structure, where surface wave signals were monitored in both pitch-catch and pulse-echo detection modes simultaneously. Under a high-cycle fatigue loading to the structure, the IDT sensors performed well with three of the sensors successfully detecting the existence of a critical fatigue crack. Visual and eddy current inspection methods subsequently verified the presence of the crack and its location. In this paper, the entire effort from the design and characterization of the IDT sensors to the final fatigue test on an actual aircraft part is discussed.

Citation Download Citation

Jeong K. Na, James L. Blackshire, and Samuel J. Kuhr "Detection of surface breaking fatigue crack on a complex aircraft structure with Rayleigh surface waves", Proc. SPIE 7295, Health Monitoring of Structural and Biological Systems 2009, 72950G (8 April 2009); https://doi.org/10.1117/12.815079

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available