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Axial crushing and optimal design of square tubes with graded thickness
Affiliation: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, China;1. Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, Hubei, PR China;2. Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment, Luoyu Road 1037, Wuhan 430074, China;3. School of Mechanical Engineering and Automation, Wuhan Textile University, Wuhan 430073, Hubei, PR China;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. Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;2. Institute of Nuclear and New Energy Technology of Tsinghua University, Collaborative Innovation Center for Advanced Nuclear Energy Technology, Beijing 100084, China;1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, Hunan 410082, PR China;2. College of Mechanical and Vehicle Engineering, Hunan University, Changsha, Hunan 410082, PR China;3. Faculty of Mechanical Engineering, Industrial University of Ho Chi Minh City, Go Vap District, HCM City, Vietnam;4. Center for Mechanical Engineering, Hanoi University of Industry, Tu Liem District, Hanoi, Vietnam;1. School of Automotive Studies, Tongji University, Shanghai 201804, 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, The University of Sydney, Sydney, NSW 2006, Australia
Abstract:Introducing thickness gradient in cross-section is a quite promising approach to increase the energy absorption efficiency and crashworthiness performance of thin-walled structures. This paper addresses the deformation mode and energy absorption of square tubes with graded thickness during axial loading. Experimental study is firstly carried out for square tubes with two types of thickness distributions and numerical analyses are then conducted to simulate the experiment. Both experimental and numerical results show that the introduction of graded thickness in cross-section can lead to up to 30–35% increase in energy absorption efficiency (specific energy absorption) without the increase of the initial peak force. In addition, structural optimization of the cross-section of a square tube with graded thickness is solved by response surface method and the optimization results validate that increasing the material in the corner regions can indeed increase the energy absorption efficiency of a square tube.
Keywords:Axial crushing  Square tube  Energy absorption  Graded thickness  RSM optimization
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