Non-destructive evaluation of thick glass fiber-reinforced composites by means of optically excited lock-in thermography |
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| Authors: | Roberto Montanini Fabrizio Freni |
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| Affiliation: | 1. BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, D-12205 Berlin, Germany;2. Benteler SGL Composite Technology GmbH, Fischerstraße 8, A-4910 Ried im Innkreis, Austria;1. Laboratory of Non Destructive Testing, Corrosion and Welding (LNDC), Department of Metallurgical and Materials Engineering, Ferderal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil;2. Physical Engineering Department, Science''s School, EAFIT University, Medellín, Colombia;3. Petrobras Research Center, Rio de Janeiro, Brazil;4. Department of Metallurgical and Materials Engineering, COPPE/UFRJ—Federal University of Rio de Janeiro, P.O, CEP 21941-972, Rio de Janeiro, RJ, Brazil;1. Département Technologie des Polymères et Composites et Ingénierie Mécanique, Mines Douai, 941 Rue Charles Bourseul, CS 10838, 59508 Douai Cedex, France;2. Département d’Opto-Acousto-Electronique, IEMN, URM CNRS 8520, Université de Valenciennes, Mont Houy BP 311, 59313 Valenciennes Cedex, France;1. Department of Mechanical Engineering, Federal University of Santa Catarina, Campus Universitário – Trindade, 88040-900 Florianopolis, Brazil;2. Electrical and Computing Engineering Department, Laval University, G1K 704 Quebec City, Canada |
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| Abstract: | Optically excited lock-in thermography (OLT) has been exploited for quantitative assessment of simulated subsurface defects in thick glass fiber reinforced polymer (GFRP) composite laminates routinely employed for the manufacturing of luxury yachts. The paper investigates the detection limits associated to defects geometry and depth as well as recognition of barely visible impact damage over the external gel-coat finish layer. The obtained results demonstrated the effectiveness of lock-in infrared thermography as a powerful and non-contact full-field measurement technique for the inspection of large GFRP structures. In particular, results showed that, by using a transmission set-up instead than a reflection one, accurate assessment (standard uncertainty < 1.4%) of impact damages could be attained, whereas estimation of delaminations depth is critically influenced by the actual area and aspect ratio of the discontinuity. A simple model to account for this dependency has been proposed. |
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