Frequency domain reference-free crack detection using transfer impedances in plate structures

Seunghee Park; Changgil Lee; Hoon Sohn

doi:10.1117/12.815432

8 April 2009 Frequency domain reference-free crack detection using transfer impedances in plate structures

Seunghee Park, Changgil Lee, Hoon Sohn

Proceedings Volume 7295, Health Monitoring of Structural and Biological Systems 2009; 72951B (2009) https://doi.org/10.1117/12.815432
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2009, San Diego, California, United States

Abstract

A new concept of reference-free damage detection methodology is developed using transfer impedances to detect crack damage in a plate-like structure without using previously collected baseline data. Conventional impedance-based damage detection techniques have been shown to be vulnerable to other types of changes such as temperature variation that may not be relevant to defects of interest. One of potential disadvantages of the conventional techniques is frequent falsealarms due to these undesirable variations that may occur particularly for field applications. In order to reduce these false-alarms, this paper proposes a new methodology that utilizes transfer impedances obtained between two pairs of collocated PZT patches instead of the electromechanical impedance obtained at one PZT patch. The proposed technique seeks Lamb mode conversion effects caused by the presence of crack damage in plate structures. Furthermore, an instantaneous damage classification is carried out by comparing mode conversion energy among several combinations of measured signals without any user-specified threshold or relying on the baseline data. The feasibility of the proposed reference-free methodology using transfer impedances is investigated via a series of experiments conducted on an aluminum plate.

Citation Download Citation

Seunghee Park, Changgil Lee, and Hoon Sohn "Frequency domain reference-free crack detection using transfer impedances in plate structures", Proc. SPIE 7295, Health Monitoring of Structural and Biological Systems 2009, 72951B (8 April 2009); https://doi.org/10.1117/12.815432

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