Effect of combined multi-cell columns and exterior stiffeners on energy absorption parameters of thin-walled tubes under
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(2020) 42:463
TECHNICAL PAPER
Effect of combined multi‑cell columns and exterior stiffeners on energy absorption parameters of thin‑walled tubes under axial load Ali Akhavan Attar1 · S. A. Rasouli2 · S. Chahardoli1 Received: 31 January 2020 / Accepted: 27 July 2020 © The Brazilian Society of Mechanical Sciences and Engineering 2020
Abstract In this paper, the energy absorption parameters are investigated for new forms of thin-walled energy absorbers. The effect of adding stiffeners to the outer tube wall, as well as the multi-cell effect of the structure, was investigated both in a separate and simultaneous manner in a tube with the square section. This design has not been investigated in previous studies, and it stimulates innovation in its own right. Such designs can significantly increase the energy absorption of the structure with the least change in the initial geometry and the lowest costs. The nonlinear explicit finite element method was used to simulate the crushing process in the tubes. The numerical simulation results were validated with the results of experimental tests, and a good agreement was observed. Finally, the parameters such as specific energy absorption, crush force efficiency, initial peak force, and mean crush force were calculated and analyzed. The results showed that the proper combination of stiffeners in the middle sides of the tube wall and the creation of a multi-cell column made it possible to improve the specific energy absorption up to 89% and crush force efficiency up to 52% compared with the reference tube, which is a significant improvement. Also, while comparing some of the results, it was analyzed why sometimes inserting stiffeners on the outer wall of tubes is better than the multi-cell method to increase the SEA of structure. Keywords Thin-walled tube · SEA · LS DYNA · Stiffeners · Multi-cell columns
1 Introduction Today, the use of thin-walled structures that dissipate energy through plastic deformation is expanding. These absorbers are employed to protect structures and reduce damages and failures caused by collision [1–4]. They have different types that absorb energy in various ways. Among them, the more suitable absorbers are the tube structures which are progressively crushed. This is due to the high energy absorption efficiency, low weight, and low cost of these structures. The aluminum alloys are used as energy absorbers in various forms, the most important reason for the high aluminum Technical editor: João Marciano Laredo dos Reis. * S. A. Rasouli [email protected]; [email protected] 1
Department of Mechanical Engineering, Bu-Ali Sina University, Hamedan, Iran
Department of Mechanical Engineering, Faculty of Engineering, Malayer University, Malayer, Iran
2
strength-to-weight ratio. The higher the absorber deformation, the higher the energy absorption level. However, the amount of energy absorbed by each structure should be compared and evaluated proportional to its mass [5–8]. Three important and effective parameters can be consid
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