Geometrical discontinuities effects on lateral crushing and energy absorption of tubular structures

Rouzegar, Jafar; Assaee, H.; Niknejad, Abbas; Elahi, Seyed Ali

doi:10.1016/j.matdes.2014.09.041

Cited by 29 publications

(14 citation statements)

References 31 publications

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“…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%

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: 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

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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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“…The failure mechanism and energy absorption capacity of two square tubes with different cell orientations were examined, and it was found that by a combination of cell geometries, more complex deformation mode occurs, which leads to an increase in the total energy absorption of the structure. Rouzegar et al [26] investigated the effects of discontinuities on energy absorption parameters of tubular structures under flattening process and also tried to find the best positions for discontinuities on walls of energy absorbers in order to reduce their negative effects.…”

Section: Introductionmentioning

confidence: 99%

Axial crushing of perforated metal and composite-metal tubes

Rouzegar

Assaee

Elahi

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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This article presents experimental and numerical study of intact and perforated metal and composite-metal tubes under axial compression loading. The metal specimens were prepared by cutting commercial circular tubes into desired lengths. To build the composite-metal specimens, the aluminum tubes were wrapped with fiber-reinforced composite (woven E-glass fiber and vinyl ester resin) using hand layup technique. Some circular cutouts with different diameters were drilled in the mid-height of perforated specimens. The samples were axially compressed between two rigid platens under quasistatic condition using Zwick universal testing machine. The effects of number and diameter of holes on some key parameters of energy absorbers such as peak load, specific absorbed energy and crush force efficiency are investigated. Comparing results of perforated tubes with intact specimens shows that number and diameter of holes have great effects on mentioned parameters. Numerical simulation of perforated metal tubes is performed by finite element method using Abaqus/Explicit software package, and the results show good correlation between experimental and numerical methods in the most investigated cases.

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Geometrical discontinuities effects on lateral crushing and energy absorption of tubular structures

Cited by 29 publications

References 31 publications

Metal ductility evaluation by flattening test: The geometry dependence

Metal ductility evaluation by flattening test: The geometry dependence

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

Axial crushing of perforated metal and composite-metal tubes

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