Theoretical and Experimental Evaluation of a Real-Time Corrosion Monitoring System for Measuring Pitting in Aircraft Structures

Douglas Brown, Duane Darr, Jefferey Morse, and Bernard Laskowski
Submission Type: 
Full Paper
Supporting Agencies (optional): 
US Air Force
phmce_12_021.pdf3.03 MBJune 12, 2012 - 10:25pm

This paper presents the theory and experimental validation of Analatom's Structural Health Management (SHM) system for monitoring corrosion. Corrosion measurements are acquired using a micro-sized Linear Polarization Resistance (uLPR) sensor. The uLPR sensor is based on conventional macro-sized Linear Polarization Resistance (LPR) sensors with the additional benefit of a reduced form factor making it a viable and economical candidate for remote corrosion monitoring of high value structures, such as buildings, bridges, or aircraft.

A series of experiments were conducted to evaluate the uLPR sensor for AA 7075-T3. Test coupons were placed alongside Analatom's uLPR sensors in a series of accelerated tests. LPR measurements were sampled at a rate of once per minute and converted to a corrosion rate using the algorithms presented in this paper. At the end of the experiment, pit-depth due to corrosion was computed for each sensor from the recorded LPR measurements and compared to the average pit-depth measured on the control coupons. The results demonstrate the effectiveness of the sensor as an efficient and practical approach to measuring pit-depth for AA 7075-T3.

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Submission Keywords: 
structural health monitoring
Submission Topic Areas: 
Structural health monitoring
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