Comparison of nondestructive microfailure evaluation of fiber-optic Bragg grating and acoustic emission piezoelectric sensors using fragmentation test |
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| Affiliation: | 1. Department of Polymer Science and Engineering, Research Center for Aircraft Parts Technology, Gyeongsang National University, Jinju 660-701, Korea;2. Department of Mechanical Engineering, Inha University, Inchon 402-751, Korea;3. Korea Institute of Aerospace Technology, Korean Air, Daejon 305-811, Korea;4. Department of Mechanical Design Engineering, Pusan National University, Busan 660-735, Korea;1. Hydraulic Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210029, China;2. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China;3. Key Laboratory of Navigation Structure Construction Technology of Ministry of Transport, Nanjing Hydraulic Research Institute, Nanjing 210029, China;1. Life Science College of Liaoning Normal University, Dalian 116029, China;2. Lamprey Research Centre, Liaoning Normal University, Dalian 116029, China;1. Department of Electrical and Electronics Engineering, Engineering Faculty, Aksaray University, Aksaray, Turkey;2. Department of Electrical and Electronics Engineering, Faculty of Technology, Gazi University, TR-06500 Ankara, Turkey;3. Department of Physics, Faculty of Sciences, Gazi University, TR-06500 Ankara, Turkey;1. Laser Laboratory, Department of Physics, University of Mar del Plata and National Research Council (CONICET), J.B. Justo 4302, 7600 Mar del Plata, Argentina;2. Institute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), J. B. Justo 4302, 7600 Mar del Plata, Argentina;3. Centro de Investigaciones Ópticas, (CIC - CONICET La Plata), POBox No 3, 1897 Gonnet–La Plata, Argentina;4. Facultad de Ingeniería, Universidad Nacional de La Plata (UNLP), Argentina;1. UPIITA IPN, Avenida Instituto Politécnico Nacional, No. 2580, Col. Barrio la Laguna Ticomán, Delegación Gustavo A. Madero, C.P. 07340 México, D.F., Mexico;2. Departamento de Física, CINVESTAV-IPN, Av. Instituto Politécnico Nacional 2508, Col. San Pedro Zacatenco, C.P. 07360 México, D.F., Mexico;3. Instituto Politécnico Nacional-Centro de Desarrollo de Productos Bióticos (CEPROBI). Carr. Yautepec–Jojutla, km 6. San Isidro, C.P. 62730 Yautepec, Morelos, Mexico |
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| Abstract: | Nondestructive evaluation of microfailure mechanisms in two-diameter SiC fibers/epoxy composites is investigated using a directly embedded fiber-optic sensor attached with an acoustic emission piezoelectric (AE-PZT) sensor. Interfacial shear strength by fragmentation test, and optical failure observation inside microcomposite can contribute to analyze two sensors quantitatively. Although fiber Bragg grating (FBG) sensor exhibits sudden wavelength shift due to plastic deformation by larger diameter SiC fiber breakage, AE-PZT monitors much more precise microfailure process, such as the fiber break or matrix cracking. Since the FBG sensor can measure the strain at only a single point, whether it can detect a fiber break in single-fiber composite specimen depends on its proximity to the failure location. In addition, micro-strain measurement at one single point may not provide enough information on the whole microfailure process including multiple fiber breakage and matrix crack. It can be considered that FBG sensor can be somewhat effective in measuring the continuous micro-strain change due to the internal disturbance such as resin curing, whereas AE-PZT sensor can be effective in detecting the microfailure by elastic wave propagation through the composite materials. |
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