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Design of eddy current-based dielectric constant meter for defect detection in glass fiber reinforced plastics
Affiliation:1. Department of Mechanics, Tianjin University, Tianjin, China;2. School of Engineering, University of Liverpool, Liverpool, UK;1. University of Applied Sciences Upper Austria, 4600 Wels, Austria;2. Aerospace & Advanced Composites GmbH, 2700 Wiener Neustadt, Austria;3. CSEM SA, 6055 Alpnach Dorf, Switzerland;1. Georgia Tech-CNRS UMI2958, Georgia Tech Lorraine, 2 Rue Marconi, 57070 Metz, France;2. School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA;3. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA;1. Fraunhofer Institute for Ceramic Technology and Systems, Material Diagnostic, Dresden, Germany;2. TU Dresden, Textile Machinery and High Performance Material Technology, Dresden, Germany;3. TU Dresden, Chair Sensor Systems for Non-Destructive Testing, Dresden, Germany;4. TU Dresden, Institute for Lightweight Engineering and Polymer Technology, Dresden, Germany;5. Leibniz Institute of Polymer Research, Dresden, Germany;6. DLR, Center for Lightweight-Production-Technology, Stade, Germany;7. SURAGUS GmbH, Dresden, Germany;8. SABCA LIMBURG N.V., Belgium;9. BMW AG, Landshut, Germany;10. Karl Mayer Malimo, Chemnitz, Germany
Abstract:This paper presents the design of an eddy current testing probe for inspection of non-conductive glass fiber reinforced plastics. Because the magnetic field contains information pertaining to the permittivity of materials under test, eddy current testing offers the possibility of flaw detection in non-conductive materials through detection of the difference in permittivity between the intact part and the defective part of each material. We analytically investigated the design of a probe suitable for dielectric constant measurements. Experimental studies proved that the proposed probe can detect slit defects and flat-bottomed holes located 2 mm away from the surface of the glass fiber reinforced plastic samples.
Keywords:Composite materials  FRP (fiber reinforced) plastic  Dielectric  Eddy currents  Theoretical modeling
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