scholarly journals Study of Energy Absorption Efficiency for a Few Thin-walled Tubes in Axial Crushing

2010 ◽  
Vol 4 (7) ◽  
pp. 875-890 ◽  
Author(s):  
Tsutomu UMEDA ◽  
Koji MIMURA ◽  
Takahiro MORISAKA
Keyword(s):  
Energy Absorption ◽  
Absorption Efficiency ◽  
Axial Crushing ◽  
Energy Absorption Efficiency ◽  
Thin Walled

Energy Absorption of Origami Crash Box: Numerical Simulation and Theoretical Analysis

2018 ◽  
Author(s):  
Mengyan Shi ◽  
Jiayao Ma ◽  
Yan Chen ◽  
Zhong You
Keyword(s):  
Energy Absorption ◽  
Theoretical Study ◽  
Low Cost ◽  
Deformation Mode ◽  
Absorption Efficiency ◽  
Great Promise ◽  
Good Match ◽  
Energy Absorption Efficiency ◽  
Thin Walled ◽  
Initial Peak

Thin-walled tubes as energy absorption devices are widely in use for their low cost and high manufacturability. Employing origami technique on a tube enables induction of a predetermined failure mode so as to improve its energy absorption efficiency. Here we study the energy absorption of a hexagonal tubular device named the origami crash box numerically and theoretically. Numerical simulations of the quasi-static axial crushing show that the pattern triggers a diamond-shaped mode, leading to a substantial increase in energy absorption and reduction in initial peak force. The effects of geometric parameters on the performance of the origami crash box are also investigated through a parametric study. Furthermore, a theoretical study on the deformation mode and energy absorption of the origami crash box is carried out, and a good match with numerical results is obtained. The origami crash box shows great promise in the design of energy absorption devices.

A Novel Omnidirectional Self-Locked Energy Absorption System Inspired by Windmill

2020 ◽  
Vol 87 (8) ◽  
Author(s):  
Yizhe Liu ◽  
Feng Xiong ◽  
Kuijian Yang ◽  
Yuli Chen
Keyword(s):  
Energy Absorption ◽  
Absorption Efficiency ◽  
Absorption System ◽  
Tube System ◽  
Round Tube ◽  
Action Mode ◽  
Energy Absorption Efficiency ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Shed Light

Abstract Impact accidents cause great damage to lives and properties because the destructiveness, direction, and action mode of impact loadings can hardly be predicted. Ordinary thin-walled tube systems for energy absorption require outside constraints or inside fasteners to avoid tube splashing, which affects the modifiability of the systems and limits their application in emergencies. In an effort to break through this limitation, inspired by windmill, a novel omnidirectional self-locked energy absorption system has been proposed. The proposed system is made up of thin-walled tubes with windmill-liked cross section, which are specially designed to interlock with adjacent tubes and thus provide constraints among individual tubes to resist impact loadings in spatial arbitrary directions. The spatial omnidirectional self-locking capability of the windmill-inspired system is demonstrated under distributed and concentrated impact loadings. Moreover, the windmill-inspired system shows higher energy absorption efficiency than that of the widely used round tube system and previous self-locked system under loadings in various directions, and their energy absorption properties can be further improved by combining with the round tube system, adjusting the geometric parameter of each tube and designing the arrangement of tubes with different properties in the system. This work may shed light on the energy absorption system design and expand the application of self-locked energy absorption systems.

scholarly journals Quasi-static axial crushing of hexagonal origami crash boxes as energy absorption devices

2019 ◽  
Vol 10 (1) ◽  
pp. 133-143 ◽  
Author(s):  
Jiayao Ma ◽  
Huaping Dai ◽  
Mengyan Shi ◽  
Lin Yuan ◽  
Yan Chen ◽  
...  
Keyword(s):  
Energy Absorption ◽  
Reasonable Agreement ◽  
Low Cost ◽  
Absorption Efficiency ◽  
Numerical Results ◽  
Peak Force ◽  
Axial Crushing ◽  
Energy Absorption Efficiency ◽  
Absorption Performance ◽  
Initial Peak

Abstract. Thin-walled tubes are widely used as energy absorption devices for their low cost and high manufacturability. Introduction of the origami technique enables the tube to follow a pre-determined failure mode and to improve its energy absorption efficiency. This paper examines the energy absorption characteristics of the origami crash box under quasi-static axial crushing. Both experimental and numerical results show that the origami pattern develops a diamond-shaped mode, bringing a reduction in initial peak force and a significant increase in energy absorption compared to the conventional hexagonal tube. The sensitivity of its energy absorption performance to various parameters is studied, and it is shown to achieve 68.29 % increase in the specific energy absorption and 13.91 % reduction in the initial peak force in the optimal case. Furthermore, an analytical solution is presented for the energy absorption, which achieves reasonable agreement with the numerical results.

scholarly journals Design and Numerical Simulation of Pyramidal Prefolded Patterned Thin-Walled Tubes

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Junxian Zhou ◽  
Chuang Dong ◽  
Bingzhi Chen ◽  
Xu Niu
Keyword(s):  
Energy Absorption ◽  
High Performance ◽  
Geometric Analysis ◽  
Deformation Mode ◽  
Absorption Efficiency ◽  
Energy Absorption Efficiency ◽  
Thin Walled ◽  
Comparative Results ◽  
Energy Absorbing ◽  
Deformation Modes

An improved pyramidal prefolded pattern was designed and applied to thin-walled tubes. This delicately designed pattern modularizes the tube to control the folding process and act as an inducer to trigger deformation modes with outstanding crushing performance. Dynamic crushing tests were conducted numerically; the simulation results reveal that the patterned square tube developed a deformation mode with shorter wavelength, better load consistencies, and higher energy-absorption efficiency (up to 29%) than that of the traditional counterpart. Moreover, geometric analysis was performed and structural improvements were conducted by applying the optimal geometric parameters onto an octagonal profile. The designed patterned octagonal tube collapsed into a highly efficient deformation mode known as diamond mode. Furthermore, the comparative results show that patterned octagonal tubes demonstrated an energy absorption up to 90.1% higher than that of a conventional square column while improving the geometric compliance. These findings enrich research on patterned tubes and provide new explorations for the development of high-performance energy-absorbing structures.

Rate Dependent Reinforcement of Liquid Nanofoam on Thin-Walled Tubes

2017 ◽  
Author(s):  
Mingzhe Li ◽  
Bang He ◽  
Saeed Barbat ◽  
Sihao Gu ◽  
Weiyi Lu
Keyword(s):  
Energy Absorption ◽  
Hybrid Structure ◽  
Absorption Efficiency ◽  
Theoretical Limit ◽  
Rate Dependent ◽  
Buckling Stress ◽  
Energy Absorption Efficiency ◽  
Post Buckling ◽  
Thin Walled ◽  
Solid Liquid

Thin-walled metal tubes have been widely used as energy absorbers to mitigate adverse effects of impact and protect structures and facilities. However, once the initial buckling stress of the tube is reached, the post-buckling plateau of the tube has a much reduced average stress which determines the energy absorption efficiency of the empty tube. As a result, the real energy absorption efficiency of the thin-walled tube is much lower than the theoretical limit which is proportional to the value of initial buckling stress. We hypothesize that by filling thin-walled tubes with the novel liquid nanofoam (LN), (i) the energy absorption efficiency of the hybrid structure can reach the theoretical limit, and (ii) the main working mechanism is the effect of solid-liquid interaction on tube buckling. To test these hypotheses, we have characterized the energy absorption efficiency of LN filled steel tubes by using quasi-static compression tests and dynamic impacts. The quasi-static behavior of LN filled tubes is characterized by an Instron 5982 universal tester. Results show that the gravimetric and volumetric energy absorption efficiencies of LN filled steel tubes are 20% and 220% higher than the values of empty tubes, respectively. This is due to the changed buckling mode and the promoted post-buckling stress of the hybrid structure by the highly compressible LN. The dynamic behavior of LN filled tubes is characterized by a dynamic impact test (∼3 m/s) with a lab-customized drop tower apparatus. It is found that both the gravimetric and volumetric energy absorption efficiencies of LN filled tubes are further increased by 16%. The strain rate dependent behavior of LN filled tubes must be attributed to the solid-liquid interaction between the LN and the steel tube wall, which is further verified by comparing the mechanical behaviors of LN filled tubes with solid foams filled tubes. Our experimental results have demonstrated that the energy absorption efficiency of thin-walled tubes are significantly improved by the LN filler especially at higher strain rates. This hybrid structure may have a potential for future use in the design of light-weight and small scale cellular structures for vehicle safety and crashworthiness.

Axial crushing behavior and energy absorption efficiency of corrugated tubes

2014 ◽  
Vol 54 ◽  
pp. 1028-1038 ◽  
Author(s):  
Arameh Eyvazian ◽  
Meisam K. Habibi ◽  
Abdel Magid Hamouda ◽  
Reza Hedayati
Keyword(s):  
Energy Absorption ◽  
Absorption Efficiency ◽  
Axial Crushing ◽  
Energy Absorption Efficiency ◽  
Crushing Behavior
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