Evaluation of the crash energy absorption of hydroformed bumper stays

Sohn, Sung-Man; Kim, B.J.; Park, K.S.; Moon, Young Hoon

doi:10.1016/j.jmatprotec.2006.11.184

Cited by 19 publications

(5 citation statements)

References 3 publications

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“…Under different loading conditions, these kinds of structures, as energy absorbing structures, may undergo several different processes such as folding, inversion, flattening, splitting processes and so on. For example, circular thin-walled tubes under axial and lateral compressions are investigated by many researchers [1][2][3][4][5][6]. Alghamdi [7] and Olabi et al [8] presented reviews of the collapsible impact energy absorbers and the metallic energy absorbing structures, respectively.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the energy absorption and contact force of unstiffened and grid-stiffened composite cylindrical shells under lateral compression

Moeinifard

Liaghat

Rahimi

et al. 2016

Composite Structures

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Please cite this article as: Moeinifard, M., Liaghat, G., Rahimi, G., Talezadehlari, A., Hadavinia, H., Experimental investigation on the energy absorption and contact force of unstiffened and grid-stiffened composite cylindrical shells under lateral compression, Composite Structures (2016), doi: http://dx.doi.org/10. 1016/j.compstruct. 2016.05.067 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractIn this paper, two different types of unstiffened and lozenge grid-stiffened Eglass/Epoxy composite cylindrical shells are experimentally investigated under lateral compression. The composite shells are compressed in two different loading conditions; between two rigid flat platens and between a rigid flat platen and a rigid cylindrical indenter which is aligned perpendicular to the shell axis. The effects of the grid stiffeners on the stiffness, contact force and energy absorption capacity of the composite cylindrical shells are investigated in the two mentioned loading conditions. Incorporation of grid stiffeners in the composite cylindrical shells leads to an increase in the structural stiffness, contact force and energy absorbing capacity in both loading conditions. Furthermore, it is observed that the effect of the stiffeners on the structural stiffness is dominant in the elastic deformation stage of the compression processes. The results show that stiffening the composite cylindrical shells with lozenge grid stiffeners can increase the specific energy absorption almost twice in comparison with the unstiffened composite shells; and among all of the specimens, the grid-stiffened structures compressed between two rigid flat platens have the highest specific energy absorption, while the unstiffened structures compressed by the cylindrical indenter have the least capacity to absorb energy.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation on the energy absorption and contact force of unstiffened and grid-stiffened composite cylindrical shells under lateral compression

Moeinifard

Liaghat

Rahimi

et al. 2016

Composite Structures

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“…In another study conducted by Sohn et al to absorb the energy that occurs during crashes in vehicles, Hydroformed (shaped by liquid pressure) buffers were used and the collision energy was tried to be absorbed linearly. According to the results obtained, it was reported that good crashworthiness was obtained [6]. Lin Yuan et al designed and analyzed a series of origami crash boxes with square, rectangular and polygonal cross-sections with a conical shape [7].…”

Section: Introductionmentioning

confidence: 99%

Estimating the crashworthiness performances of Collision Boxes Using ANN

Adanur

2023

Preprint

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Studies on the development of energy absorbing systems that minimize vehicle chassis damage in traffic accidents are increasing day by day. Many designs have been made in the studies on crash boxes used to absorb the energy released in the event of an accident. The specific energy absorption/ energy/FP crashworthiness values used to determine the efficiency of the designed crash boxes in this study were estimated using the Artifical Neural Network (ANN). The input layer of the ANN model consists of materials (DP600, DP800 and DP1000), thickness of materials (between 0.8 and 2.2 mm) and initial speed (10m/s, 12m/s and 16 m/s). In the ANN model, 42 different models were created by changing the different training function (training, trainlm and trainrp), transfer function (tansig and logsig) and the number of neurons in the hidden layer (between 9 and 33). R2 and RSME methods were used to evaluate the efficiency of ANN models. The training function was found to be highly accurate (R2: 0.99999 and RSME: 0.314727E-05) when the training function was “Trainlm” and the number of neurons in the hidden layer was 33. The training and testing results of the ANN model show that ANN can be used to estimate the specific energy absorption/energy/PCH value of crash boxes.

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“…In their research, they used ABAQUS software for numerical simulations and proposed an optimal mode for their proposed absorber in terms of geometry. In reference, 14 absorbers using the inversion process were used in the manufacturing of car bumpers. In the reference, 15 Niknejad and Tavassolimanesh investigated the inversion process of capped-end frustum and extracted force–displacement curves for capped-end frusta analytically and experimentally.…”

Section: Introductionmentioning

confidence: 99%

“…Regarding the inversion of cylindrical shells, we can refer to the research. [12][13][14] Reddy et al 13 experimentally and numerically introduced a new type of absorber using the inversion process. In their research, they used ABAQUS software for numerical simulations and proposed an optimal mode for their proposed absorber in terms of geometry.…”

Section: Introductionmentioning

confidence: 99%

Investigating energy absorption of thin-walled steel structures with combined mechanisms including inversion, folding and expansion

Waleed¹,

Ruhaima

Farhan

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this research, thin-walled steel energy absorbers were investigated. The introduced structures absorb energy through the processes of inversion, folding and expansion. Each absorber consists of two end-capped frusta and a cylindrical shell. The intended absorbers were experimentally made and then tested. The mechanical properties of the used materials were extracted by performing tensile tests and then used for simulation. The simulations of this research were carried out using LS-DYNA software. After comparing the experimental and numerical results, a good agreement between the results was observed and then the obtained results were discussed. The intended absorbers were examined in terms of the thickness of the lower frustum, the height of the middle shell and the angle of the upper frustum. The obtained results showed that by increasing the thickness of the lower frustum, energy absorption in the inversion process increased. In addition, the investigations related to the effect of height on the collapse properties showed that increasing the height of the middle shell with a thickness of 2 mm for the lower frustum led to a decrease in energy absorption. Also, in the investigations carried out on the half angle of the frustum, it was found that the contribution of energy absorption in the expansion process was low.

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Evaluation of the crash energy absorption of hydroformed bumper stays

Cited by 19 publications

References 3 publications

Experimental investigation on the energy absorption and contact force of unstiffened and grid-stiffened composite cylindrical shells under lateral compression

Experimental investigation on the energy absorption and contact force of unstiffened and grid-stiffened composite cylindrical shells under lateral compression

Estimating the crashworthiness performances of Collision Boxes Using ANN

Investigating energy absorption of thin-walled steel structures with combined mechanisms including inversion, folding and expansion

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