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Numerical investigation on the loading-delamination-unloading behavior of adhesive joints
Affiliation:1. State Key Laboratory of Fluid Power & Mechatronic System, Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Department of Engineering Mechanics, Zhejiang University, Hangzhou 310027, China;2. Institute for Composites Science Innovation (InCSI), School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;1. Center for Condensed Matter Sciences, National Taiwan University, Taipei 106, Taiwan;2. Department of Physics and Astronomy, Seoul National University, Seoul 151-747, South Korea;1. Ore Deposits and Exploration Centre, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;2. Centre for Exploration Targeting (CET), ARC Centre of Excellence for Core to Crust Fluid Systems, The University of Western Australia, Crawley, WA 6009, Australia;3. Xinjiang Research Centre for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China;4. Department of Geology, Lakehead University, 955 Oliver Road, Thunder Bay, ON P7B 5E1, Canada;1. Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou, Jiangsu Province, 213164, China;2. Department of Materials Chemistry, Faculty of Materials Science and Engineering, Changzhou University, Changzhou, Jiangsu Province, 213164, China;1. Cellular Materials Laboratory (CellMat), Condensed Matter Physics Department, University of Valladolid, Paseo de Belén 7, 47011 Valladolid, Spain;2. Nanophysics – Smart Materials Group, Istituto Italiano di Tecnologia (IIT), Via Morego 30, 16163 Genova, Italy;3. Institute of Polymer Science and Technology (ICTP-CSIC), Juan de la Cierva 3, 28006 Madrid, Spain;1. College of Aerospace Engineering, Chongqing University, Chongqing 400044, China;2. Bristol Composites Institute (ACCIS), University of Bristol, Queen’s Building, University Walk, Bristol BS8 1TR, UK;3. School of Astronautics, Beihang University, Beijing 100191, China
Abstract:An elastic-plastic interface model at finite deformations is utilized to investigate the irreversible delamination behavior of adhesive joints subjected to loading-delamination-unloading. The interface model accounts for the irreversible delamination in the fracture process zone induced by the localized plastic deformation and damage. The interfacial parameters in the cohesive model are obtained by fitting the available experimental data. Results suggest that the cohesive model can capture the irreversible delamination failure behavior observed in adhesively bonded joints during a loading-unloading cycle. The overall nonlinear response is dominated by the cohesive strength and initial damage displacement jump. Further, we also investigate the effect of the ductile mechanisms for the bulk layer on the competition between the plastic deformation of the bulk layer and the delamination of the interface. It is observed that the degradation of unloading stiffness is attributed to the inelastic behavior of the interface.
Keywords:A  Laminates  B  Delamination  B  Adhesion  C  Finite element analysis (FEA)
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