Structural health monitoring of composite materials with FBG sensors: damage detection and remaining useful life prediction

Boz, Talha (2012) Structural health monitoring of composite materials with FBG sensors: damage detection and remaining useful life prediction. [Thesis]

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Advanced composites are widely employed in load bearing structures due to their high strength-to-weight ratios, stiffness, corrosion resistance and fatigue performance. Monitoring the manufacturing process and detecting the damage during service are rather troublesome. In this study, practicality and feasibility of fiber optic based sensors are evaluated for monitoring the state or the structural health of the composite materials from manufacturing phase to service phase continuously. 2D and 3D composite structures were designed and manufactured by resin transfer molding (RTM) method. A novel ingress/egress technique is utilized to embed the fiber optic sensors. The capabilities of fow and cure monitoring of fiber Bragg grating (FBG) sensors are presented. The strain and the temperature sensitivity of the embedded FBG sensors was calculated. Following the calculation of the sensitivities, a manufactured composite with embedded FBG sensor is subjected to cantilever beam experiments. To be able to show that the FBG sensor is capable of detecting damage formation in composites, the composite plate was drilled to create artificial defects of different size. The wavelength shift of the FBG was monitored as a function of the size of the hole and wavelength measurements are compared with those of sound structure to conclude on the health of the structure. Technique for prediction of remaining useful life (RUL) of composite materials with embedded FBG sensors is demonstrated and fatigue testing of composite materials are performed to verify this technique.
Item Type: Thesis
Uncontrolled Keywords: Structural health monitoring (SHM). -- Fiber Bragg grating (FBG) sensor. -- Damage detection. -- Resin transfer molding (RTM). -- Remaining useful life (RUL) prediction. -- Yapısal sağlık gözetimi (SHM). -- Fiber Bragg ızgara (FBG) sensörü. -- Hasar bulma. -- Reçine iletim kalıplama (RTM). -- Kalan ömür tahmin etme (RUL). -- Reçine geçiş kalıplaması. -- Kalan kullanılabilir ömür tahmin etme.
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ163.12 Mechatronics
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Mechatronics
Faculty of Engineering and Natural Sciences
Depositing User: IC-Cataloging
Date Deposited: 13 Oct 2014 11:25
Last Modified: 26 Apr 2022 10:02

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