Attempts to improve energy absorption characteristics of circular metal tubes subjected to axial loading

Salehghaffari, S.; Tajdari, Mehdi; Panahi, Masoud Shariat; Mokhtarnezhad, F.

doi:10.1016/j.tws.2010.01.012

Cited by 149 publications

(51 citation statements)

References 29 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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“…With this purpose, circular (Tai and Huang, 2010), square (Abramowicz and Jones, 1984); (Aljawi, 2002), polygonal (Younes, 2009), tapered (Nagel and Thambiratnam, 2004) and double-cell tubular profiles, have been evaluated among others. Some works have tried to maximize the energy absorption characteristics with the implementation of friction mechanisms implicit in the interface of contact between the walls of concentric tubes, obtaining favorable results in regards to the efficiency of the force of displacement (Salehghaffari and Tajdari, 2010); (Shakeri and Salehghaffari, 2007). Another option is to modify the entire rigidity of the structure through the use of imperfections or discontinuities on the walls of the profile such as dented initiators (Lee and Hahn, 1999), dented corners (Alavi and Fallah, 2012), longitudinal grooves (Zhang and Huh, 2009), patterned windows (Song and Chen, 2013) and circular discontinuities in the sides of the tube (Arnold and Altenhoft, 2004).…”

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Evaluation of energy absorption performance of steel square profiles with circular discontinuities

Szwedowicz¹,

Estrada²,

Cortés³

et al. 2014

Lat. Am. j. solids struct.

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This article details the experimental and numerical results on the energy absorption performance of square tubular profile with circular discontinuities drilled at lengthwise in the structure. A straight profile pattern was utilized to compare the absorption of energy between the ones with discontinuities under quasi-static loads. The collapse mode and energy absorption conditions were modified by circular holes. The holes were drilled symmetrically in two walls and located in three different positions along of profile length. The results showed a better performance on energy absorption for the circular discontinuities located in middle height. With respect to a profile without holes, a maximum increase of 7% in energy absorption capacity was obtained experimentally. Also, the numerical simulation confirmed that the implementation of circular discontinuities can reduce the peak load (P max ) by 10%. A present analysis has been conducted to compare numerical results obtained by means of the finite element method with the experimental data captured by using the testing machine. Finally the discrete model of the tube with and without geometrical discontinuities presents very good agreements with the experimental results.

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“…The crush takes place progressively, and consequently the energy can be dissipated with high energy absorption, long stroke and crushing stability along a large plastic deformation process (Reid, 1993) . The thinwalled circular tubes under axial impact loading could absorb the energy with different mechanisms such as splitting (Niknejad et al, 2013), extrusion (Galib et al, 2006), expansion (Salehghaffari et al, 2010), trigger (Huang and Wang, 2010), inversion (Guist and Marble, 1966;Rosa et al, 2003;Luo et al, 2007;Gupta, 2014;andQiu et al, 2014), stiffeners (lateral or longitudinal ) (Zhang and Suzuki, 2007), metal cutting (Jin and Altenhof, 2011). During the progressive crushing under axial compression, different types of deformation modes such as an axisymmetric (concertina) mode, nonsymmetric (diamond) mode, mixed mode or global Euler buckling mode, could happen depending on the geometric parameters of the tube (length, diameter and thickness),material properties and boundary conditions (Andrews et al, 1983;Abramowicz and Jones, 1984).…”

Section: Introductionmentioning

confidence: 99%

A New Configuration of Circular Stepped Tubes Reinforced with External Stiffeners to Improve Energy Absorption Characteristics Under Axial Impact

Zahran

Xue

Esa

et al. 2017

Lat. Am. j. solids struct.

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State-of-the art studies of impact crushing circular stepped tube (inversion tube) introduce various approaches to improve the energy absorption capacities. Adding external longitudinal stiffeners on the circular stepped tubes is a new approach that have a great effect and interest. In the current study, finite element analysis using (LS-DYNA/WORKBENCH ANSYS) is performed on a series of numerical models of aluminum circular stepped tubes that are externally stiffened by a constant number of longitudinal stiffeners distributed around the cross section of the circular stepped tube. The numerical models are implemented under an axial impact crushing scenario. Furthermore, a new improved formula for prediction of steady inversion load is proposed. The theoretical predictions are found to be in good agreement with the numerical results with an error within 12%. A comparative study is conducted to compare the energy absorption characteristics and inversion mechanism between the newly proposed tubes and the conventional stepped tube. The results showed that addition of external longitudinal stiffeners on circular stepped tubes could imply greatest improvement for the energy absorption up to 104%, specific energy absorption capability (energy absorption per unit mass) up to 54.9%, the crush force efficiency up to 40.3% and increase the inversion stroke length in comparison with the unstiffened circular stepped tubes. A newfound role of external longitudinal stiffeners added to the stepped tubes that controls the inversion and deformation mechanism is presented.

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Attempts to improve energy absorption characteristics of circular metal tubes subjected to axial loading

Cited by 149 publications

References 29 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

Evaluation of energy absorption performance of steel square profiles with circular discontinuities

A New Configuration of Circular Stepped Tubes Reinforced with External Stiffeners to Improve Energy Absorption Characteristics Under Axial Impact

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