Damage Monitoring in Woven Composites Using Fiber-Bragg Grating Sensors on Multiple Time Scales

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Title: Damage Monitoring in Woven Composites Using Fiber-Bragg Grating Sensors on Multiple Time Scales
Author: Propst, Adam Christopher
Advisors: Dr. K. J. Peters, Committee Chair
Dr. M. A. Zikry, Committee Member
Dr. M. K. Ramasubramanian, Committee Member
Abstract: This study investigates the application of Fiber Bragg Grating (FBG) optical sensors interrogation techniques over several time scales to monitor damage in composite structures due to low velocity impacts events. Optical fiber sensors are embedded into carbon fiber/epoxy resin woven composites using a single-step cure process. The composite specimens are subjected to multiple low energy impacts until failure. Impact events are characterized by acceleration and position sensors integral to the impactor head. The embedded FBG sensors are interrogated using three different interrogation techniques. Low speed, full spectrum measurements are recorded using a tunable laser source. High speed, peak wavelength detection data is taken using a commercial peak wavelength interrogation system. Finally, high speed full spectrum measurements are recorded using new instrumentation developed at Brigham Young University. By qualitatively examining the responses of these three techniques and comparing the FBG data with impact characterization data, a more complete picture of the composite health is available.
Date: 2009-05-11
Degree: MS
Discipline: Aerospace Engineering
URI: http://www.lib.ncsu.edu/resolver/1840.16/1879


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