Damage Assessment in Composites using Fiber Bragg Grating Sensors

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Title: Damage Assessment in Composites using Fiber Bragg Grating Sensors
Author: Prabhugoud, Mohanraj
Advisors: Dr. KARA J. PETERS, Committee Chair
Dr. MOHAMMED A. ZIKRY, Committee Member
Dr. TASNIM HASSAN, Committee Member
Dr. ERIC C. KLANG, Committee Member
Abstract: This dissertation develops a methodology to assess damage in composites using fiber Bragg grating (FBG) strain sensors. First, a strain-transfer model using the finite element (FE) method is developed to simulate the response of an embedded FBG to the applied loading. This FE model is also able to calculate birefringence in the FBG due to applied transverse loads. The model is validated considering the two-dimensional problem of diametrical compression of polarization-maintaining fibers. A modified T-matrix model is then formulated to simulate the response of an embedded FBG due to an applied axial strain field. The response of FBGs surface mounted on PMMA and two-dimensional woven composites subjected to multiple low velocity impacts is experimentally investigated. The complex spectral response is related to the residual strains after impact in the PMMA specimens and the surface strain to failure in the two-dimensional woven composites. The feasibility of using FBGs to measure internal strain in woven composites during damage progression is finally considered.
Date: 2005-11-09
Degree: PhD
Discipline: Mechanical Engineering
URI: http://www.lib.ncsu.edu/resolver/1840.16/3930


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