Creating load-adapted mechanical joints between tubes and sheets by controlling the material flow under plastically unstable tube upsetting

verfasst von: A. Sviridov, M. Rusch, A. Almohallami, C. Bonk, A. Bouguecha, M. Bambach, B. A. Behrens
Abstract: Mechanical joining processes provide various advantages over conventional fusion welding of metallic components such as shorter cycle times, little or no heat input and reduced need for subsequent surface finishing operations. Several investigations in the past have shown that joints between tubes and sheets or plates can be manufactured by upsetting operations. Under axial compression, the tube develops a plastic instability in form of bulge. In-between two such bulges, a force and form fit to sheet material can be created. Previous work concentrated on forming fully developed bulges, i.e., at the end of the bulging process, both hinges of the bulge are in contact. This paper presents a numerical and experimental study aiming at optimizing the bulge shape to increase the bearable limit loads. Two new bulge designs are investigated, an 'arrow bulge' and a 'wave bulge'. The paper details the results of FE-simulations of the bulge shapes under bending and torsion loads. Forming tools were designed and both bulge shapes were produced experimentally. The results show that the material flow under compressive plastic instability can be controlled and that the resulting bulge shapes yield improved strength in various load cases.
Organisationseinheit(en): Institut für Umformtechnik und Umformmaschinen
Externe Organisation(en): Brandenburgische Technische Universität Cottbus - Senftenberg (BTU)
Typ: Konferenzaufsatz in Fachzeitschrift
Journal: Procedia Engineering
Band: 207
Seiten: 968-973
Anzahl der Seiten: 6
ISSN: 1877-7058
Publikationsdatum: 15.11.2017
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Allgemeiner Maschinenbau
Elektronische Version(en): https://doi.org/10.1016/j.proeng.2017.10.860 (Zugang: Offen)
: Details im Forschungsportal „Research@Leibniz University“

BibTeX

@article{055a3c539dd94e2da1fa5e36cf7ead3e,
title = "Creating load-adapted mechanical joints between tubes and sheets by controlling the material flow under plastically unstable tube upsetting",
abstract = "Mechanical joining processes provide various advantages over conventional fusion welding of metallic components such as shorter cycle times, little or no heat input and reduced need for subsequent surface finishing operations. Several investigations in the past have shown that joints between tubes and sheets or plates can be manufactured by upsetting operations. Under axial compression, the tube develops a plastic instability in form of bulge. In-between two such bulges, a force and form fit to sheet material can be created. Previous work concentrated on forming fully developed bulges, i.e., at the end of the bulging process, both hinges of the bulge are in contact. This paper presents a numerical and experimental study aiming at optimizing the bulge shape to increase the bearable limit loads. Two new bulge designs are investigated, an 'arrow bulge' and a 'wave bulge'. The paper details the results of FE-simulations of the bulge shapes under bending and torsion loads. Forming tools were designed and both bulge shapes were produced experimentally. The results show that the material flow under compressive plastic instability can be controlled and that the resulting bulge shapes yield improved strength in various load cases.",
keywords = "mechanical joining, shape optimization, tube forming, upset bulging",
author = "A. Sviridov and M. Rusch and A. Almohallami and C. Bonk and A. Bouguecha and M. Bambach and Behrens, {B. A.}",
note = "Funding information: The project “Process extension to increase connection strength and extend the range of application” eR f. -No. AiF 18243BG is financed and supervised by the European Research Association for Sheet Metal Working (EFB). In the scope of the program to promote Industrial Collective Research it is funded by the German Federation of Industrial Research Associations (AiF) with means of the Federal Ministry of Economic Affairs and Energy (BMWi) on basis of a decision by the German Bundestag.; International Conference on the Technology of Plasticity, ICTP 2017 ; Conference date: 17-09-2017 Through 22-09-2017",
year = "2017",
month = nov,
day = "15",
doi = "10.1016/j.proeng.2017.10.860",
language = "English",
volume = "207",
pages = "968--973",
journal = "Procedia Engineering",
issn = "1877-7058",
publisher = "Elsevier BV",
}