Crush energy absorption of composite channel section specimens |
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| Authors: | Paolo Feraboli Bonnie Wade Francesco Deleo Mostafa Rassaian |
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| Affiliation: | 1. Department of Aeronautics and Astronautics, University of Washington, Seattle, WA, United States;2. Advanced Structures Technology, Boeing Phantom Works, Seattle, WA, United States;1. Department of Aerospace Engineering, University of Bristol, Oceans Building, University Walk, Bristol B58 1TR, UK;2. Laboratoire de Mécanique et d’Acoustique 31, ch. Joseph Aiguier, 13402, Marseille, France;1. Department of Engineering, Università degli studi della Campania “Luigi Vanvitelli”, via Roma 29, Aversa, CE, Italy;2. C.I.R.A. Italian Aerospace Research Center, via Maiorise, Capua, CE, Italy;1. School of Engineering, Sun Yat-Sen University, Guangzhou City 510006, China;2. State Key Laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan University, Changsha 410082, China;3. School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, NSW 2006, Australia;1. School of Engineering, Sun Yat-Sen University, Guangzhou City, 510006, China;2. State Key Laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan University, Changsha, 410082, China;3. School of Aerospace, Mechanical and Mechatronic Engineering, Sydney University, Sydney, NSW, 2006, Australia;4. Guangzhou Power Supply Bureau Limited Company, Guangzhou City, 510006, China;1. Faculty of Science, Engineering and Technology, Swinburne University of Technology, John Street, Hawthorn, VIC 3122, Australia;2. College of Engineering, Al-Muthanna University, Iraq;3. Advanced Composite Structures Australia Pty Ltd, 198 Lorimer Street, Port Melbourne, VIC 3207, Australia;1. Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC3122, Australia;2. College of Engineering, Al-Muthanna University, Iraq;1. State Key Laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan University, Changsha 410082, China;2. School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia;3. State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, China |
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| Abstract: | Carbon/epoxy square tubes and channel sections have been used in modern automotive and aircraft structures, respectively, as dedicated components designed to dissipate energy under controlled collapse. However, there are currently no specialized test methods for the characterization of Specific Energy Absorption (SEA) of composite materials. A systematic experimental investigation is conducted to evaluate the effect of geometric features on crush behavior. From a square tube, individual test segments are machined in order to isolate corner radii and flat sections of varying sizes, for a total of five different test geometries. Laminate thickness, material system, manufacturing process, and test methodology are kept constant throughout the study. For the material system and lay-up considered in this study, fiber tensile fracture and tearing at the corners is responsible for the vast percentage of the energy absorbed, while frond formation and splaying of the flat segments is responsible for a much lower percentage. An analytical expression is derived that accounts for the combined behavior of corner elements and flat segments in the crush behavior of more complex test articles, such as tubes. |
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