Characterisation of mechanical behaviour and damage analysis of 2D woven composites under bending |
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| Affiliation: | 1. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China;2. The Sixtieth Institute of the Headquarters of General Staff, Nanjing 210016, PR China;3. Nanjing Fiberglass R & D Institute, Nanjing 210012, PR China;4. Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Leicestershire, LE11 3TU, UK;1. Department of Mechanical Engineering Sciences, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford GU2 7XH, United Kingdom;2. School of Materials, University of Manchester, Manchester M13 9PL, United Kingdom;3. Dipartimento di Tecnica e Gestione dei Sistemi Industriali, Università degli Studi di Padova, Stradella S. Nicola 3, I-36100 Vicenza, Italy;4. Gazi University, Faculty of Engineering, Department of Mechanical Engineering, Maltepe, 06570 Ankara, Turkey;5. College of Textiles, North Carolina State University, 1000 Main Campus Dr. Raleigh, NC 27695, USA;1. Sir Lawrence Wackett Aerospace Research Centre, School of Engineering, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia;2. Institute for Technical Textiles (ITA), RWTH Aachen University, Otto-Blumenthal-Straße 1, 52074 Aachen, Germany;1. Department of Mechanical Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Republic of Korea;2. Vehicle Safety CAE Team 1, Hyundai Motor Company, Gyeonggi-do 445-709, South Korea;3. Institute of Nano Science and Technology, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Republic of Korea;1. Rescoll, Société de recherche, 17300 Rochefort, France;2. Institut Pprime, CNRS, ISAE-ENSMA, Université de Poitiers, F-86962 Futuroscope, Chasseneuil, France |
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| Abstract: | In this paper, flexural loading of woven carbon fabric-reinforced polymer laminates is studied using a combination of experimental material characterisation, microscopic damage analysis and numerical simulations. Mechanical behaviour of these materials was quantified by carrying out tensile and large-deflection bending tests. A substantial difference was found between the materials' tensile and flexural properties due to a size effect and stress stiffening of thin laminates. A digital image-correlation technique capable of full-field strain-measurement was used to determine in-plane shear properties of the studied materials. Optical microscopy and micro-computed tomography were employed to investigate deformation and damage mechanisms in the specimens fractured in bending. Various damage modes such as matrix cracking, delaminations, tow debonding and fibre fracture were observed in these microstructural studies. A two-dimensional finite-element (FE) model was developed to analyse the onset and propagation of inter-ply delamination and intra-ply fabric fracture as well as their coupling in the fractured specimen. The developed FE model provided a correct prediction of the material's flexural response and successfully simulated the sequence and interaction of damage modes observed experimentally. |
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| Keywords: | A Fabrics B Damage tolerance D Mechanical testing C Finite element analysis |
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