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Mechanical behavior and health monitoring by Acoustic Emission of unidirectional and cross-ply laminates integrated by piezoelectric implant
Institution:1. LUNAM University, Maine University, Acoustic Laboratory of Maine University (LAUM) CNRS UMR 6613, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France;2. Sfax University, Faculty of Sciences of Sfax, Department of Physics BP1171, 3000 Sfax, Tunisia;1. Department of Mechanical Engineering, University of Bath, Bath BA2 7AY, UK;2. Department of Mechanical Engineering Sciences, University of Surrey, Guildford GU2 7XH, UK;1. School of aerospace engineering and applied mechanics, Tongji University, Shanghai 200092, China;2. Tokyo University of Science, Noda 278-851, Japan;3. Japan Aerospace Exploration Agency (JAXA), Sagamihara 252-5210, Japan;1. College of Textile, 2401 Research Drive, North Carolina State University, Raleigh, NC 27695, USA;2. Textile Research Division, National Research Centre, 33 El Bohouth St., Dokki 12622, Egypt;3. Department of Mechanical and Aerospace Engineering, Campus Box 7910, North Carolina State University, Raleigh, NC 27695, USA;1. Univ. Bretagne Occidentale, FRE CNRS 3744, IRDL, F-29600 Morlaix, France;2. Université de Limoges, GEMH, EA 3178, F-19300 Egletons, France;3. Université Clermont Auvergne, CNRS, Institut Pascal, F-63000 Clermont-Ferrand, France;1. Institute of Structures and Design, German Aerospace Center (DLR), Pfaffenwaldring 38-40, 70569 Stuttgart, Germany;2. Mechanical Engineering Department, The University of Akron, Akron, OH 44325-3903, USA
Abstract:Recent progress in sensor technologies, signal processing and electronics has made it possible to fulfill the need for the development of in-service structural health monitoring (SHM) systems. This study presents a health monitoring of composite materials integrated by piezoelectric sensor using Acoustic Emission (AE) technique. A series of specimens of composite laminates with and without piezoelectric implant were subject to three-point bending in static and creep tests while continuously monitoring the response by the AE technique. The analysis and observation of AE signals lead to the identification of the acoustic signatures of damage mechanisms in composite laminates. The mechanical behavior of composites with and without integrated sensor shows no difference in the form. The incorporation of piezoelectric sensor influences specially the fracture load and causes low degradation of mechanical properties of materials. One of the major differences between the two types of materials (with and without embedded sensor) is the intense acoustic activity in the integrated material.
Keywords:Laminates  Piezoelectric implant  Three-point bending  Static  Creep  Acoustic Emission  Damage
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