Shape optimisation of cold roll formed sections considering effects of cold working

Journal article


Qadir, Sangar, Nguyen, Van Bac, Hajirasouliha, Iman, Ceranic, Boris, Tracada, Eleni and English, Martin 2021. Shape optimisation of cold roll formed sections considering effects of cold working. Thin-Walled Structures. https://doi.org/10.1016/j.tws.2021.108576
AuthorsQadir, Sangar, Nguyen, Van Bac, Hajirasouliha, Iman, Ceranic, Boris, Tracada, Eleni and English, Martin
Abstract

The design development of new cold roll formed sections can lead to a significant reduction in material costs if the sections are optimised for strength performance considering the effect of shapes and change of material properties by cold working during the manufacturing process. In this paper, the buckling and ultimate strengths of cold roll formed channel and zed sections with intermediate stiffeners under distortional bending were studied using experimentally validated Finite Element (FE) models. The section strength was optimised using FE modelling and optimisation based on Design Of Experiments (DOE) and response surface methodology. A nonlinear FE model was first developed for a referenced section subject to four-point bending tests and the section’s dimensions and material properties were defined as geometric parameters using the DOE technique. A response surface was then used to determine the influences of the stiffeners’ location, shape, size, and cold working at the section corners and stiffener bends during the manufacturing process. A multi-objective genetic algorithm method was deployed to obtain optimal shapes for the sections with maximum buckling and ultimate strengths while keeping the same amount of material used. The results revealed that the ultimate bending moment capacities could be enhanced up to 17% and 25% for the channel and zed sections, respectively. Including the cold working effect had considerable enhancement in the ultimate moment capacities, with a maximum increase of 5%. The results of this study clearly demonstrated an efficient and effective approach to optimise design for strength performance of cold roll formed sections.

KeywordsOptimisation; Cold roll formed steel; Distortional buckling; Ultimate strength
Year2021
JournalThin-Walled Structures
PublisherElsevier
ISSN0263-8231
Digital Object Identifier (DOI)https://doi.org/10.1016/j.tws.2021.108576
Web address (URL)https://www.sciencedirect.com/science/article/pii/S0263823121006571?dgcid=author
hdl:10545/626158
Output statusPublished
Publication dates06 Nov 2021
Publication process dates
Deposited13 Dec 2021, 14:33
Accepted13 Oct 2021
ContributorsUniversity of Derby, University of Sheffield and Hadley Industries plc
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