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Analysis of fracture in sheet bending and roll forming

Version 2 2024-06-04, 02:29
Version 1 2018-07-30, 10:15
conference contribution
posted on 2018-05-02, 00:00 authored by A D Deole, Matthew BarnettMatthew Barnett, Matthias WeissMatthias Weiss
© 2018 Author(s). The bending limit or minimum bending radius of sheet metal is conventionally measured in a wiping (swing arm) or in a vee bend test and reported as the minimum radius of the tool over which the sheet can be bent without fracture. Frequently the material kinks while bending so that the actual inner bend radius of the sheet metal is smaller than the tool radius giving rise to inaccuracy in these methods. It has been shown in the previous studies that conventional bend test methods may under-estimate formability in bending dominated processes such as roll forming. A new test procedure is proposed here to improve understanding and measurement of fracture in bending and roll forming. In this study, conventional wiping test and vee bend test have been performed on martensitic steel to determine the minimum bend radius. In addition, the vee bend test is performed in an Erichsen sheet metal tester equipped with the GOM Aramis system to enable strain measurement on the outer surface during bending. The strain measurement before the onset of fracture is then used to determine the minimum bend radius. To compare this result with a technological process, a vee channel is roll formed and in-situ strain measurement carried out with the Vialux Autogrid system. The strain distribution at fracture in the roll forming process is compared with that predicted by the conventional bending tests and by the improved process. It is shown that for this forming operation and material, the improved procedure gives a more accurate prediction of fracture.

History

Event

European Scientific Association for Material Forming. Conference (2018 : Palermo, Italy)

Volume

1960

Pagination

1 - 6

Publisher

ESAFORM

Location

Palermo, Italy

Place of publication

Palermo, Italy

Start date

2018-04-23

End date

2018-04-25

ISSN

0094-243X

eISSN

1551-7616

ISBN-13

9780735416635

Language

eng

Publication classification

E1 Full written paper - refereed

Copyright notice

2018, AIP Publishing

Title of proceedings

ESAFORM 2018 : Proceedings of the European Scientific Association for Material Forming Conference

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