A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
A new deformation assisted joining process for connecting tubes to stronger tubesheets
https://orcid.org/0000-0002-2630-4593
Abstract This paper presents a new deformation assisted joining process for connecting tubes to stronger tubesheets, which involves reduction of the free tube end by local indentation of the tubesheet and subsequent flaring against the tubesheet surface to create a mechanical interlocking. The methodology draws from the fundamentals of the new proposed process to the identification of the major variables and their influence on the overall deformation mechanics. The work combines experimentation and numerical simulation with finite elements and is carried out in unit cells consisting of a polymer tube and a metallic sheet with a drilled hole that are representative of the tube-to-tubesheet connections of heat exchangers. It is shown that the new deformation assisted joining process can produce tube-to-tubesheet connections in which the tubes are softer than the tubesheets, paving the way for manufacturers of heat exchangers to combine polymer tubes with metallic tubesheets (and shells) in applications where the media running inside the tubes is incompatible with the use of metallic tubes in long service life. In addition to the originality resulting from the new polymer-metal tube-to-tubesheet connections, the new proposed deformation assisted joining process is also the first ever in its category to make use of tube reduction, instead of tube expansion, to produce these types of joints.
Highlights Innovative deformation assisted joining process for connecting tubes to stronger tubesheets. First time ever application of tube reduction to produce tube-to-tubesheet joints. Fostering new heat exchanger designs that make use of polymer tubes and metallic tube sheets and shells. Numerical and experimental investigation on unit cells to demonstrate the process applicability. Destructive pull-out tests to evaluate the force to detach the tubes from the tubesheets.
A new deformation assisted joining process for connecting tubes to stronger tubesheets
https://orcid.org/0000-0002-2630-4593
Abstract This paper presents a new deformation assisted joining process for connecting tubes to stronger tubesheets, which involves reduction of the free tube end by local indentation of the tubesheet and subsequent flaring against the tubesheet surface to create a mechanical interlocking. The methodology draws from the fundamentals of the new proposed process to the identification of the major variables and their influence on the overall deformation mechanics. The work combines experimentation and numerical simulation with finite elements and is carried out in unit cells consisting of a polymer tube and a metallic sheet with a drilled hole that are representative of the tube-to-tubesheet connections of heat exchangers. It is shown that the new deformation assisted joining process can produce tube-to-tubesheet connections in which the tubes are softer than the tubesheets, paving the way for manufacturers of heat exchangers to combine polymer tubes with metallic tubesheets (and shells) in applications where the media running inside the tubes is incompatible with the use of metallic tubes in long service life. In addition to the originality resulting from the new polymer-metal tube-to-tubesheet connections, the new proposed deformation assisted joining process is also the first ever in its category to make use of tube reduction, instead of tube expansion, to produce these types of joints.
Highlights Innovative deformation assisted joining process for connecting tubes to stronger tubesheets. First time ever application of tube reduction to produce tube-to-tubesheet joints. Fostering new heat exchanger designs that make use of polymer tubes and metallic tube sheets and shells. Numerical and experimental investigation on unit cells to demonstrate the process applicability. Destructive pull-out tests to evaluate the force to detach the tubes from the tubesheets.
A new deformation assisted joining process for connecting tubes to stronger tubesheets
https://orcid.org/0000-0002-2630-4593
Abstract This paper presents a new deformation assisted joining process for connecting tubes to stronger tubesheets, which involves reduction of the free tube end by local indentation of the tubesheet and subsequent flaring against the tubesheet surface to create a mechanical interlocking. The methodology draws from the fundamentals of the new proposed process to the identification of the major variables and their influence on the overall deformation mechanics. The work combines experimentation and numerical simulation with finite elements and is carried out in unit cells consisting of a polymer tube and a metallic sheet with a drilled hole that are representative of the tube-to-tubesheet connections of heat exchangers. It is shown that the new deformation assisted joining process can produce tube-to-tubesheet connections in which the tubes are softer than the tubesheets, paving the way for manufacturers of heat exchangers to combine polymer tubes with metallic tubesheets (and shells) in applications where the media running inside the tubes is incompatible with the use of metallic tubes in long service life. In addition to the originality resulting from the new polymer-metal tube-to-tubesheet connections, the new proposed deformation assisted joining process is also the first ever in its category to make use of tube reduction, instead of tube expansion, to produce these types of joints.
Highlights Innovative deformation assisted joining process for connecting tubes to stronger tubesheets. First time ever application of tube reduction to produce tube-to-tubesheet joints. Fostering new heat exchanger designs that make use of polymer tubes and metallic tube sheets and shells. Numerical and experimental investigation on unit cells to demonstrate the process applicability. Destructive pull-out tests to evaluate the force to detach the tubes from the tubesheets.
A new deformation assisted joining process for connecting tubes to stronger tubesheets
Alves, Luis M. (author) / Afonso, Rafael M. (author) / Martins, Paulo A.F. (author)
Thin-Walled Structures ; 173
2022-01-20
Article (Journal)
Electronic Resource
English
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