Flattening process of empty and polyurethane foam-filled E-glass/vinylester composite tubes – An experimental study

Niknejad, Abbas; Assaee, H.; Elahi, Seyed Ali; Golriz, Ali A.

doi:10.1016/j.compstruct.2013.01.009

Cited by 48 publications

(13 citation statements)

References 36 publications

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“…With the development of technology and science, all kinds of new foam material are frequently developed. Many researches about new refilled material have been carried out by scholars [2][3][4][5][6]. However, the current experiments and studies about it are mainly focused on several limited materials, like aluminum foam [7][8][9], polyurethane foam and so on.…”

Section: Introductionmentioning

confidence: 98%

The mechanical behavior of thin-walled tube filled with hollow metal spheres

Luo

Nie

et al. 2015

Composite Structures

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Section: Introductionmentioning

confidence: 98%

The mechanical behavior of thin-walled tube filled with hollow metal spheres

Luo

Nie

et al. 2015

Composite Structures

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“…Experimental investigation on the flattening process of the empty and polyurethane foam-filled E-glass/vinyl ester composite tubes is presented by Niknejad et al [26]. Their results showed that the presence of polyurethane foam inside the composite tubes suppresses the circumferential delimitation process and fiber fracturing and consequently, increases the specific absorbed energy by the composite tubes during the flattening process.…”

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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“…In addition, this figure shows that although the contraction ratios of the tested specimens are different, slopes of the different experimental curves during the second and the third stages are the same. Reviewing of the theoretical equations (18) and (21) that estimate this part of the graph shows that predictions by the present relation give the same slope of the second and third parts of the theoretical graph for the same specimens with different contraction ratios. Theoretical and experimental diagrams of the steady load versus the contraction ratio of the mentioned specimens are illustrated in Figure 19.…”

Section: Effects Of Contraction Ratiomentioning

confidence: 60%

Contraction process of the circular tubes on the conical die: Theory and experiment

Siyahpoosh

Niknejad

2014

Proceedings of the Institution of Mechanical Engineers, Part B:

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A new theoretical model of plastic behavior of circular metal tubes during the contraction process as a metal forming and energy absorber processes is presented in this study. Some theoretical relations are developed to predict the axial load versus the axial displacement of the contraction process, based on the theoretical model. Some quasi-static experiments were performed on circular aluminum and brazen tubes to validate the theoretical analysis. In this research, effects of tube radius, contraction ratio, tube wall thickness and angle of conical die on energy absorption characteristics of circular tubes under axial quasi-static loading are investigated by the experimental and theoretical methods. Results show that there is an admissible agreement between the theoretical results and experimental measurements. Experimental results show that there is a steady force during the end zone of the process which is an important factor in viewpoint of the energy absorption. Also, the steady force increases by increment of die semi-angle, tube radius, friction coefficient and the contraction ratio.

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Flattening process of empty and polyurethane foam-filled E-glass/vinylester composite tubes – An experimental study

Cited by 48 publications

References 36 publications

The mechanical behavior of thin-walled tube filled with hollow metal spheres

The mechanical behavior of thin-walled tube filled with hollow metal spheres

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

Contraction process of the circular tubes on the conical die: Theory and experiment

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