Measuring changing strain fields in composites with Distributed Fiber-Optic Sensing using the optical backscatter reflectometer |
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| Affiliation: | 1. Applied Mechanics Laboratory, Mechanical Engineering & Aeronautics Department, University of Patras, Greece;2. Dept. of Aerospace Science and Technology, Politecnico di Milano, Italy;3. INASCO Hellas Co, Athens, Greece;1. Vehicle Technology Directorate, United States Army Research Laboratory, Aberdeen Proving Ground, MD 21005, United States;2. Mechanical Systems, Structures & Dynamics, Honeywell Aerospace, Phoenix, AZ 85034, United States;3. United Technologies Research Center, East Hartford, CT 06105, United States;4. Sikorsky Aircraft Corporation, Stratford, CT 06615, United States;5. Army Aviation Applied Technology Directorate, Fort Eustis, VA 23604, United States;1. Universitat Politècnica de València, Instituto de Ciencia y Tecnología del Hormigón, Valencia, Spain;2. Universitat Politècnica de València, Instituto de Telecomunicaciones y Aplicaciones Multimedia, Valencia, Spain |
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| Abstract: | Background/purposeMeasurements of strains in critical components are often required in addition to finite element calculations when evaluating a structure.MethodsThis paper describes how standard optical fibers, bonded to the surface or embedded in a laminate, can measure strain fields along the entire length of the fiber, using the optical backscatter reflectometer.ResultsA strain field measurement can be much better compared to simulations than the more common single point measurements with strain gauges or Bragg Gratings. Changes of the strain field can be related to damage development and can be used for structural health monitoring. Practical aspects of using the fibers are also discussed.ConclusionDistributed Fiber-Optic Sensing was successfully embedded and bonded to a composite joint. Adhesive damage was identified and the strain field agreed well with FE-Analysis. |
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| Keywords: | B Debonding D Non-destructive testing E Joints Distributed Fiber-Optic Sensing |
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