Joining sandwich composite panels to tubes

Alves, L.M.; Afonso, Rafael M.; Martins, P.A.F.

doi:10.1177/1464420718763463

Cited by 10 publications

(10 citation statements)

References 10 publications

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“…This value is in close agreement with that utilized by the authors in earlier works on joining by forming. 17 In this investigation, the effective stress s in equation (1) did not account for the strength differential effect of the polymer core of the sandwich composites because the applied stresses were mainly compressive. In other words, the flow stress of the polymer core in tension was assumed to be identical to that in compression, which was experimentally determined by means of stack compression tests.…”

Section: Numerical Modellingmentioning

confidence: 99%

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Joining by forming of metal–polymer sandwich composite panels

Pragana

Contreiras

Bragança

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part B:

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This article presents new joining-by-forming processes to assemble longitudinally two metal–polymer sandwich composite panels perpendicular to one another. Process design draws from an earlier development of the authors for metal sheets to new concepts based on the combination of sheet-bulk forming with mortise-and-tenon joints. Selected examples obtained from experimentation and finite element modelling give support to the presentation. A new three-stage joining by the forming process is capable of producing mechanically locked joints with larger and stiffer flat-shaped heads than those fabricated by alternative single- or two-stage solutions. Failure in the new three-stage joining by the forming process is found to take place by cracking instead of disassembling after unbending the flat-shaped head of the joint back to its original shape. The required forming forces to produce the new metal–polymer joints are below 15 kN, allowing them to be an effective, easy-to-implement alternative to existing solutions based on adhesive bonding, welding and mechanical fastening.

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Section: Numerical Modellingmentioning

confidence: 99%

“…This value is in close agreement with that utilized by the authors in earlier works on joining by forming. 17…”

Section: Numerical Modellingmentioning

confidence: 99%

Joining by forming of metal–polymer sandwich composite panels

Pragana

Contreiras

Bragança

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…These types of joints could also be obtained by electromagnetic instead of hydraulic pressure. 4 More recently, Alves et al 5 proposed a new joining by forming process that involves producing an annular flange with rectangular cross section by partial sheet-bulk of the tube wall thickness followed by upsetting of the free tube end against the sheet with a flaring punch. The resulting mechanical interlocking (also named as a 'form-fit' joint) was successfully applied to produce hybrid sheet-tube connections at the tube ends.…”

Section: Introductionmentioning

confidence: 99%

Joining by forming of polymer-metal sheet-tube connections

Alves

Afonso

Martins

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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This paper focuses on the mechanical joining of sheets to tubes made from dissimilar materials. The objective is to investigate the applicability of deformation-assisted joining by annular sheet squeezing to hybrid polymer-metal connections in order to understand how this new process can be used as an alternative to conventional fastening and adhesive bonding. The presentation draws from identification of the main operating parameters and modes of deformation to characterisation of the process workability limits. Selected test cases retrieved from experimentation and finite element simulation are included. The work is an extension of the previous work of the authors on metallic materials, and results show that joining by annular sheet squeezing is an easy and effective solution to connect a metal sheet to a polymer tube away from its end.

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“…Despite the progresses in sheet-to-sheet and tube-to-tube connections, the joining of sheets-to-tubes is still preferentially accomplished by means of conventional fastening and welding technologies. Little progress has been made in the application of deformation-assisted joining to sheet–tube connections, aside from recent developments involving the utilization of form-fit mechanical joints based on compression beads formed by local buckling [14], on the combination of tube compression beads with flaring [15], and on the combination of partial sheet-bulk compression of tubes with upsetting [16] or flaring [17] (Figure 1a–c).…”

Section: Introductionmentioning

confidence: 99%

“…Regarding the connection of sheets to tubes, which is the main objective of this paper, it is worth mentioning that all the previously mentioned deformation-assisted joining processes based on mechanical form-fit joints [14,15,16,17] involve multiple operations. This undercuts their advantages in material consumption, energy requirements, and end-of-life recycling with disadvantages related to efficiency and costs that are better ensured by conventional technologies based on fastening, welding, and adhesive bonding.…”

Section: Introductionmentioning

confidence: 99%

Deformation-Assisted Joining of Sheets to Tubes by Annular Sheet Squeezing

et al. 2019

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This paper is built upon the deformation-assisted joining of sheets to tubes, away from the tube ends, by means of a new process developed by the authors. The process is based on mechanical joining by means of form-fit joints that are obtained by annular squeezing (compression) of the sheet surfaces adjacent to the tubes. The concept is different from the fixing of sheets to tubes by applying direct loading on the tubes, as is currently done in existing deformation-assisted joining solutions. The process is carried out at room temperature and its development is a contribution towards ecological and sustainable manufacturing practices due to savings in material and energy consumption and to easier end-of-life disassembly and recycling when compared to alternative processes based on fastening, riveting, welding and adhesive bonding. The paper is focused on the main process parameters and special emphasis is put on sheet thickness, squeezing depth, and cross-section recess length of the punches. The presentation is supported by experimentation and finite element modelling, and results show that appropriate process parameters should ensure a compromise between the geometry of the mechanical interlocking and the pull-out strength of the new sheet–tube connections.

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Joining sandwich composite panels to tubes

Cited by 10 publications

References 10 publications

Joining by forming of metal–polymer sandwich composite panels

Joining by forming of metal–polymer sandwich composite panels

Joining by forming of polymer-metal sheet-tube connections

Deformation-Assisted Joining of Sheets to Tubes by Annular Sheet Squeezing

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