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Fiber Bragg Gratings, IT Techniques and Strain Gauge Validation for Strain Calculation on Aged Metal Specimens
Aeronautical Technologies Center, Technologic Park of Alava., C/Juan de la Cierva 1., Miñano (Alava) 01510, Spain
Department of Electronics and Telecommunications, Faculty of Engineering, University of the Basque Country, Alda Urquijo, s/n. 48013 Bilbao, Spain
* Authors to whom correspondence should be addressed.
Received: 13 December 2010; in revised form: 5 January 2011 / Accepted: 14 January 2011 / Published: 19 January 2011
Abstract: This paper studies the feasibility of calculating strains in aged F114 steel specimens with Fiber Bragg Grating (FBG) sensors and infrared thermography (IT) techniques. Two specimens have been conditioned under extreme temperature and relative humidity conditions making comparative tests of stress before and after aging using different adhesives. Moreover, a comparison has been made with IT techniques and conventional methods for calculating stresses in F114 steel. Implementation of Structural Health Monitoring techniques on real aircraft during their life cycle requires a study of the behaviour of FBG sensors and their wiring under real conditions, before using them for a long time. To simulate aging, specimens were stored in a climate chamber at 70 °C and 90% RH for 60 days. This study is framed within the Structural Health Monitoring (SHM) and Non Destructuve Evaluation (NDE) research lines, integrated into the avionics area maintained by the Aeronautical Technologies Centre (CTA) and the University of the Basque Country (UPV/EHU).
Keywords: Structural Health Monitoring (SHM); Non Destructive Evaluation (NDE); Fiber Bragg Grating (FBG); Infrared Thermography (IT); strain; Relative Humidity (RH); temperature; aging
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Montero, A.; Saez de Ocariz, I.; Lopez, I.; Venegas, P.; Gomez, J.; Zubia, J. Fiber Bragg Gratings, IT Techniques and Strain Gauge Validation for Strain Calculation on Aged Metal Specimens. Sensors 2011, 11, 1088-1104.
Montero A, Saez de Ocariz I, Lopez I, Venegas P, Gomez J, Zubia J. Fiber Bragg Gratings, IT Techniques and Strain Gauge Validation for Strain Calculation on Aged Metal Specimens. Sensors. 2011; 11(1):1088-1104.
Montero, Ander; Saez de Ocariz, Idurre; Lopez, Ion; Venegas, Pablo; Gomez, Javier; Zubia, Joseba. 2011. "Fiber Bragg Gratings, IT Techniques and Strain Gauge Validation for Strain Calculation on Aged Metal Specimens." Sensors 11, no. 1: 1088-1104.