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Transition of failure mode in hot stamping of AA6082 tailor welded blanks

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Title: Transition of failure mode in hot stamping of AA6082 tailor welded blanks
Authors: Liu, J
Wang, A
Gao, H
Gandra, J
Beamish, K
Zhan, L
Wang, L
Item Type: Journal Article
Abstract: A novel sheet metal forming process, by manufacturing parts in a single sheet with varying thickness, has been employed in this work. It combines hot forming and cold-die quenching, also known as HFQ®, and the use of aluminium tailor welded blanks (TWBs) into a hybrid process. A series of hot stamping tests on the AA6082 TWBs were performed to investigate the deformation behaviour and failure features. Two failure modes, i.e. circumferential necking and parallel weld necking have been observed in the formed parts depending on the forming speed and thickness ratio of the TWBs. An advanced forming limit prediction model has been developed and further integrated into finite element simulation via a cloud-based multi-objective platform1 to investigate the failure/necking features of AA6082 TWBs. The model incorporates the theories of Hosford yield function, the anisotropic nature of plastic deformation in sheet metals and the Marciniak-Kaczynski (M-K) theory. According to the theories, the incremental work per unit volume ratio (View the MathML sourcedε¯B∙σ¯B/dε¯A∙σ¯A) between Zone B (thickness imperfect zone) and Zone A (the remainder of the material) is a key parameter determining the formability, by which the complex failure features have been fundamentally studied. The transition of failure mode in a TWB was attributed to the joint effects of temperature, strain rate and loading path changes. Strain rate could accelerate the development of localised necking in the TWBs when the failure mode was in transition from the circumferential mode to parallel mode.
Issue Date: 1-Jul-2018
Date of Acceptance: 19-Feb-2018
URI: http://hdl.handle.net/10044/1/57384
DOI: https://dx.doi.org/10.1016/j.jmatprotec.2018.02.028
ISSN: 0924-0136
Publisher: Elsevier
Start Page: 33
End Page: 44
Journal / Book Title: Journal of Materials Processing Technology
Volume: 257
Copyright Statement: © 2018 Elsevier B.V. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Technology Strategy Board
Funder's Grant Number: 131818
Keywords: 0913 Mechanical Engineering
0912 Materials Engineering
0910 Manufacturing Engineering
Publication Status: Published
Online Publication Date: 2018-02-23
Appears in Collections:Mechanical Engineering
Faculty of Engineering