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A new technique for characterising mechanical properties of materials under hot stamping conditions

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Title: A new technique for characterising mechanical properties of materials under hot stamping conditions
Authors: Zhang, R
Lin, J
Shi, Z
Shao, Z
Item Type: Conference Paper
Abstract: In order to characterise mechanical properties of materials (e.g. formability) under hot stamping conditions, significant efforts have been made to the development of the biaxial tensile testing method using cruciform specimens. However, no method for necking strain determination and no cruciform specimen design have been widely accepted. In this study, a new technique for characterising mechanical behaviour of materials under hot stamping conditions has been proposed. It includes two main parts: 1) a novel spatio-temporal method for determining necking and fracture strains, and 2) a cruciform specimen design for formability evaluation using biaxial testing method. In the first part, the theoretical base of the novel spatio-temporal method has been discussed, and the method has been validated by applying to uniaxial tensile tests on AA6082 specimens. The method has also been compared with several existing popular methods, in the determination of limit strain at onset of localised necking. It is found that the novel method has greater simplicity, stability and accuracy for the determination of localised necking strain. In the second part, a proposed cruciform specimen of AA5754 has been tested under the equi-biaxial tension, and both the necking initiation location and the strain path at the location where necking initiates, have been analysed. Furthermore, the novel spatio-temporal method has been applied to the biaxial tensile test for the determination of necking and fracture strains. The results show that the designed cruciform specimen enables to initiate fracture at the centre of the specimen and realisation of linear strain path under equi-biaxial tension.
Issue Date: 17-Nov-2020
Date of Acceptance: 3-Sep-2020
URI: http://hdl.handle.net/10044/1/84523
DOI: 10.1088/1757-899X/967/1/012081
ISSN: 1757-8981
Publisher: IOP Publishing
Journal / Book Title: IOP Conference Series: Materials Science and Engineering
Volume: 967
Copyright Statement: © 2020 The Author(s). Published under licence by IOP Publishing Ltd. Content from this work may be used under the terms of theCreative Commons Attribution 3.0 licence. Any further distributionof this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Sponsor/Funder: Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/R001715/1 / PO 2105860
Conference Name: 39th International Deep Drawing Research Group Conference
Publication Status: Published
Start Date: 2020-10-26
Finish Date: 2020-10-30
Conference Place: Seoul, South Korea
Open Access location: https://doi.org/10.1088/1757-899X/967/1/012081
Online Publication Date: 2020-11-17
Appears in Collections:Mechanical Engineering



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