Local stiffness reduction in impacted composite plates from full-field measurements |
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| Authors: | J.-H. Kim F. Pierron M.R. Wisnom S. Avril |
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| Affiliation: | 1. Laboratoire de Mécanique et Procédés de Fabrication, Ecole Nationale Supérieure d’Arts et Métiers, Rue Saint-Dominique, BP 508, 51006 Châlons-en-Champagne, France;2. Advanced Composites Centre for Innovation and Science, University of Bristol, Queen’s Building, University Walk, BS8 1TR Bristol, UK;3. Center for Health Engineering, Ecole Nationale Supérieure des Mines, 158 Cours Fauriel, 42023 Saint-Etienne, France;1. Department of Civil and Environmental Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA;2. Stanford Sustainable Systems Laboratory, Department of Civil and Environmental Engineering, Stanford University, Stanford, CA 94305, USA;3. Department of Civil and Environmental Engineering, Stanford University, Stanford, CA 94305, USA;1. National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, Russia;2. International Laboratory of High Magnetic Fields and Low Temperatures, Wroc?aw, Poland;1. IDMEC, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;2. ICIST, CERIS, Department of Civil Engineering, Architecture and Georesources, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;1. Department of Civil Engineering and Mechanics, College of Engineering & Applied Science, University of Wisconsin, Milwaukee, WI 53217, USA;2. A&P Technology, 4595 East Tech Drive, Cincinnati, OH 45245, USA |
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| Abstract: | The virtual fields method (VFM) is used as an inverse procedure to process curvatures obtained from full-field measurements for the identification of the local loss of stiffness in composite plates. The VFM has been adapted to the case of a plate with stiffnesses varying spatially. Two parameterization methods for the stiffness reduction were developed: continuous (polynomial) and discrete (piecewise). In this study, the procedure is described, validated on simulated data and several experimental results are given. The method not only picks up the location of the damage but also provides a fairly good estimate of the stiffness reduction in the damaged area when the through-thickness displacement distribution in the damaged region is reasonably linear. |
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