A novel method for enhancing energy absorption capability by thin-walled sections during the flattening process

Zohrabi, Mahmoud; Niknejad, Abbas; Ziaee, Sima

doi:10.1016/j.tws.2015.09.013

Cited by 9 publications

(4 citation statements)

References 22 publications

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“…where F is the applied compressive force and δ the resultant displacement, and E, G, and k, in turn, the elastic modulus, the elastic shear modulus, and shape parameter k. For the rectangular cross-section, we followed the reference [18] and adopted = k 6/5; (5) for A being the cross-sectional area of the bent lever. In Table 2 we list the stiffness of tubes with different thickness from FEM simulations and theoretical analysis.…”

Section: Results On Flattening Test By Platensmentioning

confidence: 99%

“…Experimentally, a typical technique employed in the field is the so-called flattening test. Being one type of the ductility testing, flattening radically a tube or a test piece from pipelines or tanks or gas cylinders is able to examine the capability of plastic deformation as well as the initial quality of the structures, which has been broadly employed in the field [1][2][3][4][5][6][7]. So far, a subcommittee of the International Organization for Standardization specifies some geometrical parameters for testing pieces [8].…”

Section: Introductionmentioning

confidence: 99%

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Metal ductility evaluation by flattening test: The geometry dependence

Wang

Yang

Lei

et al. 2019

International Journal of Pressure Vessels and Piping

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The reliability of pipes, tubes and liquid tanks (cylinders) is of paramount significance to our life. The typical way to examine the ability of those structures to undergo plastic deformation is to apply a flattening test. In this paper, we used the Gurson-Tvergaard-Needleman damage model and finite element simulations to capture the flattening of a tube made of typical pipe materials. We demonstrated how the tube thickness, radius, and length would affect the critical displacement where tube failure initiates. For flattening with platens, the failure displacement first increases with tube length and reaches a peak value, and it then decreases and converges to a constant value for a particular geometry. The failure initiates at the two edges of short tubes, but shifts to the center in intermediate tubes where the failure displacement maximizes. Failure then always starts from the middle in even longer tubes. In contrast, flattening with indenters exhibits two peaks in the compressible displacement vs. tube length curve. In the end, we proposed effective experimental strategies to obtain the intrinsic ability of tubes under plastic deformation. The results reported here could be employed to characterize the mechanical properties of materials for pipes, tubes and tanks, and they could also be applied to guide the engineering design of such structures.

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Section: Results On Flattening Test By Platensmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Metal ductility evaluation by flattening test: The geometry dependence

Wang

Yang

Lei

et al. 2019

International Journal of Pressure Vessels and Piping

View full text Add to dashboard Cite

show abstract

“…Thin-walled structures have been recently widely used to design airframe and vehicles components due to their remarkable lightweight performance and energy absorption characteristics [1] [2]. Several attempts have been carried out to investigate thin-walled structures in different loading conditions through experiments [3][4], theoretical studies [5][6] and simulations [7][8][9]. Aluminum alloys have been extensively used to design thin-walled tubes of various shapes because of their good mechanical properties and relatively low processing costs [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Multi-cell energy-absorbing structures with hollow columns inspired by the beetle elytra

Hao

Liu

et al. 2020

J Mater Sci

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In this work we propose a new type of thin-walled energy absorbed structure with hollow columns that possesses a design inspired by the beetle elytra. The failure mode of the bionic thin-walled structures is firstly discussed by developing a theoretical model. The energy absorption properties of these bio-inspired multi-call thin-walled structures have been then investigated using nonlinear finite element simulations. The values of the specific energy absorption and the crushing force effectiveness have been evaluated for different structures with parametrized column nested configurations. Dynamic impact simulations of multi-cell tubes with different columns nested modes, wall thickness and impact angles have been performed and the results discussed.

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“…Many thin-walled structures with kinds of cross-sectional shapes are applied as crashworthy components because they are effective in energy absorption. In order to investigate the energy-absorbing properties of thin-walled structure, many studies has been carried out through theoretical analysis [ 1 , 2 , 3 ], numerical simulations [ 4 , 5 , 6 ], and experimental tests [ 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Microstructure of Beetle Elytra and Energy Absorption Properties of Bio-Inspired Honeycomb Thin-Walled Structure under Axial Dynamic Crushing

Hao

2018

Nanomaterials

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The beetle elytra requires not only to be lightweight to make a beetle fly easily, but also to protect its body and hind-wing from outside damage. The honeycomb sandwich structure in the beetle elytra make it meet the above requirements. In the present work, the microstructures of beetle elytra, including biology layers and thin-walled honeycombs, are observed by scanning electron microscope and discussed. A new bionic honeycomb structure (BHS) with a different hierarchy order of filling cellular structure is established. inspired by elytra internal structure. Then the energy absorbed ability of different bionic models with the different filling cell size are compared by using nonlinear finite element software LS-DYNA (Livermore Software Technology Corp., Livermore, CA, USA). Numerical results show that the absorbed energy of bionic honeycomb structures is increased obviously with the increase of the filling cell size. The findings indicate that the bionic honeycomb structure with second order has an obviously improvement over conventional structures filled with honeycombs and shows great potential for novel clean energy absorption equipment.

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A novel method for enhancing energy absorption capability by thin-walled sections during the flattening process

Cited by 9 publications

References 22 publications

Metal ductility evaluation by flattening test: The geometry dependence

Metal ductility evaluation by flattening test: The geometry dependence

Multi-cell energy-absorbing structures with hollow columns inspired by the beetle elytra

Investigation on Microstructure of Beetle Elytra and Energy Absorption Properties of Bio-Inspired Honeycomb Thin-Walled Structure under Axial Dynamic Crushing

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