Accurate kinematic measurement at interfaces between dissimilar materials using conforming finite-element-based digital image correlation |
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| Institution: | 1. King Abdullah University of Science and Technology (KAUST), Physical Science and Engineering Division (PSE), COHMAS Laboratory, Thuwal 23955-6900, Saudi Arabia;2. Institute of Solid Mechanics, Beijing University of Aeronautics & Astronautics, Beijing 100191, China;1. King Abdullah University of Science and Technology (KAUST), Physical Science and Engineering, COHMAS Laboratory, Thuwal 23955-6900, Saudi Arabia;2. SABIC, P.O. Box 319, 6160 AH Geleen, The Netherlands;1. Northwest Composite Center, School of Materials, University of Manchester, M13 9PL, UK;2. King Abdullah University of Science and Technology (KAUST), Physical Sciences and Engineering Division, COHMAS Laboratory, Thuwal 23955-6900, Saudi Arabia;3. Aerospace Research Institute, University of Manchester, M1 3NJ, UK;1. King Abdullah University of Science and Technology, Physical Sciences and Engineering Division, COHMAS Laboratory, Thuwal 23955-6900, Saudi Arabia;2. Department of Mechanical, Energy and Management Engineering, University of Calabria, Via P. Bucci 44C, 87036 Rende (CS), Italy;3. King Abdullah University of Science and Technology, Computer, Electrical and Mathematical Sciences and Engineering Division, Electrical Engineering Department, Thuwal 23955-6900, Saudi Arabia;1. King Abdullah University of Science and Technology (KAUST), Physical Science and Engineering Division, COHMAS Laboratory, Thuwal, 23955-6900, Saudi Arabia;2. SABIC T&I Corporate Research Development, Composites, P.O. Box 319, 6160 AH, Geleen, The Netherlands;1. King Abdullah University of Science and Technology (KAUST), Physical Science and Engineering Division, COHMAS Laboratory, Thuwal 23955-6900, Saudi Arabia;2. King Abdullah University of Science and Technology (KAUST), Computer, Electrical and Mathematical Sciences and Engineering Division, Thuwal 23955-6900, Saudi Arabia;3. Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, TX 78712-1229, USA;4. Department of Mathematical and Industrial Engineering, École Polytechnique de Montréal, Montréal, QC, Canada |
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| Abstract: | Digital image correlation (DIC) is now an extensively applied full-field measurement technique with subpixel accuracy. A systematic drawback of this technique, however, is the smoothening of the kinematic field (e.g., displacement and strains) across interfaces between dissimilar materials, where the deformation gradient is known to be large. This can become an issue when a high level of accuracy is needed, for example, in the interfacial region of composites or joints. In this work, we described the application of global conforming finite-element-based DIC technique to obtain precise kinematic fields at interfaces between dissimilar materials. Speckle images from both numerical and actual experiments processed by the described global DIC technique better captured sharp strain gradient at the interface than local subset-based DIC. |
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| Keywords: | Digital image correlation Dissimilar material interface Conformal mesh Global DIC |
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