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Embedding fiber Bragg grating sensors through ultrasonic additive manufacturing

Schomer, John J
http://rave.ohiolink.edu/etdc/view?acc_num=osu1483670362650083

Abstract Details

2017, Master of Science, Ohio State University, Mechanical Engineering.
Fiber Bragg Grating (FBG) sensorsare optical fibers that detect in-situ strain through deviation of a reflected wavelength of light to detect in-situ strain. These sensors are immune to electromagnetic interference, and the inclusion of multiple FBGs on the same fiber allows for a seamlessly integrated sensing network. FBGs are attractive for embedded sensing in aerospace applications due to their small noninvasive size and prospect of constant, real-time nondestructive evaluation. FBGs are typically used in composite laminate type applications due to difficulties in building them into metallic structures. Additive manufacturing, also referred to as 3D printing, can allow for the inclusion of sensors inside of structural entities by the building of material around the sensor to be embedded. In this study, FBG sensors are embedded into aluminum 6061 via ultrasonic additive manufacturing (UAM), a rapid prototyping process that uses high power ultrasonic vibrations to weld similar and dissimilar metal foils together. UAM was chosen due to the desire to embed FBG sensors at low temperatures, a requirement that excludes other additive processes such as selective laser sintering or fusion deposition modeling. This study demonstrated the feasibility of embedding FBGs in aluminum 6061 via UAM. Further, the sensors were characterized in terms of birefringence losses, post embedding strain shifts, consolidation quality, and strain sensing performance. Sensors embedded into an ASTM test piece were compared against an exterior surface mounted foil strain gage at both room and elevated temperatures using cyclic tensile tests. The effects of metal embedment at temperatures above the melting point of the protective coating (160 degrees Celsius) of the FBG sensors were explored, and the hermetic sealing of the fiber within the metal matrix was used to eplain the coating survival. In-situ FBG sensors were also used to monitor the UAM process itself. Lastly, an example application was both modeled using finite element analysis to identify areas where FBG sensors could be placed, and then built with an embedded FBG sensor.
Marcelo Dapino (Advisor)
Mo-How Shen (Committee Member)
97 p.
Mechanical Engineering
Fiber Bragg Grating, Ultrasonic Additive Manufacturing, Structural Health Monitoring, 3D Printing, Fiber Optic

Recommended Citations

Citations

  • Schomer, J. J. (2017). Embedding fiber Bragg grating sensors through ultrasonic additive manufacturing [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1483670362650083

    APA Style (7th edition)

  • Schomer, John. Embedding fiber Bragg grating sensors through ultrasonic additive manufacturing. 2017. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1483670362650083.

    MLA Style (8th edition)

  • Schomer, John. "Embedding fiber Bragg grating sensors through ultrasonic additive manufacturing." Master's thesis, Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1483670362650083

    Chicago Manual of Style (17th edition)

osu1483670362650083
1,077
© 2017, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.