Partition energy absorption of axially crushed aluminum foam-filled hat sections |
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| Institution: | 1. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, PR China;2. State Key Laboratory of Automotive Safety and Energy, Department of Automotive Engineering, Tsinghua University, Beijing 100084, PR China;3. Institute of Production Engineering and Automation, Mechanical Engineering Faculty, Wrocław University of Technology, Poland;1. Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, Hubei, PR China;2. School of Mechanical Engineering and Automation, Wuhan Textile University, Wuhan 430073, Hubei, PR China;3. Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment, Luoyu Road 1037, Wuhan 430074, PR China;1. School of Automotive Engineering, Iran University of Science & Technology, Daneshgah St., Hengam Ave., Resalat Sq., P.O. Box 16846-13114, Tehran, Iran;2. Mechanical Engineering Department, Iran University of Science & Technology, Daneshgah St., Hengam Ave., Resalat Sq., P.O. Box 16846-13114, Tehran, Iran;3. Head of Automotive Fluids and Structures Analysis Laboratory, Iran University of Science & Technology, Daneshgah St., Hengam Ave., Resalat Sq., P.O. Box 16846-13114, Tehran, Iran;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 |
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| Abstract: | The “interaction effect” between aluminum foam and metal column that takes place when foam-filled hat sections (top-hats and double-hats) are axially crushed was investigated in this paper. Based on experimental examination, numerical simulation and analytical models, a systemic approach was developed to partition the energy absorption quantitatively into the foam filler component and the hat section component, and the relative contribution of each component to the overall interaction effect was therefore evaluated. Careful observation of the collapse profile found that the crushed foam filler could be further divided into two main energy-dissipation regions: densified region and extremely densified region. The volume reduction and volumetric strain of each region were empirically estimated. An analytical model pertinent to the collapse profile was thereafter proposed to find the more precise relationship between the volume reduction and volumetric strain of the foam filler. Combined the superfolding element model for hat sections with the current model according to the coupled method, each component energy absorption was subsequently derived, and the influence of some controlling factors was discussed. According to the finite element analysis and the theoretical modeling, when filled with foam, energy absorption was found to be increased both in the hat section and the foam filler, whereas the latter contributes predominantly to the interaction effect. The formation of the extremely densified region in the foam filler accounts for this effect. |
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