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201186 https://hdl.handle.net/2286/R.2.N.201186 http://rightsstatements.org/vocab/InC/1.0/ All Rights Reserved 2025 72 pages Masters Thesis Academic theses en Muthu, Aishwarya Yang, Sui Liu, Yongming Calhoun, Ronald Arizona State University Partial requirement for: M.S., Arizona State University, 2025 Field of study: Mechanical Engineering The research presents an innovative sensor that combines a 3D-printed auxeticmetamaterial structure made from thermoplastic polyurethane (TPU) with a Fiber Bragg Grating (FBG) sensor. The auxetic material structure with its negative Poisson’s ratio property produces better strain amplification because it expands horizontally when stretched thus boosting the strain transmission to the embedded sensor. The application of optical sensors specifically FBGs outperforms piezoelectric and electronic sensors because they have EMI immunity and high sensitivity together with biocompatibility while enabling non-invasive continuous monitoring. The Bragg wavelength principle enables FBGs to produce wavelength reflections that change directly with applied strain and temperature. The research develops a re-entrant auxetic metamaterial structure with integrated FBG sensors for design and fabrication analysis. The research examines the strain-Bragg wavelength relationship to determine the relationship between strain and wavelength. The study conducts structural analysis and experimental validation to optimize metamaterial geometry for better lateral expansion and strain transfer, thus showing an innovative solution for biomedical sensors of the future. Mechanical Engineering 3D-Printed Auxetic Metamaterial-Integrated FBG Sensor: A Wearable Health Monitoring Approach