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Formability evaluation for sheet metals under hot stamping conditions by a novel biaxial testing system and a new materials model

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Title: Formability evaluation for sheet metals under hot stamping conditions by a novel biaxial testing system and a new materials model
Authors: Shao, Z
Li, N
Lin, J
Dean, T
Item Type: Journal Article
Abstract: Hot stamping and cold die quenching has been developed in forming complex shaped structural components of metals. The aim of this study is the first attempt to develop unified viscoplastic damage constitutive equations to describe the thermo-mechanical response of the metal and to predict the formability of the metal for hot stamping applications. Effects of parameters in the damage evolution equation on the predicted forming limit curves were investigated. Test facilities and methods need to be established to obtain experimental formability data of metals in order to determine and verify constitutive equations. However, conventional experimental approaches used to determine forming limit diagrams (FLDs) of sheet metals under different linear strain paths are not applicable to hot stamping conditions due to the requirements of rapid heating and cooling processes prior to forming. A novel planar biaxial testing system was proposed before and was improved and used in this work for formability tests of aluminium alloy 6082 at various temperatures, strain rates and strain paths after heating, soaking and rapid cooling processes. The key dimensions and features of cruciform specimens adopted for the determination of forming limits under various strain paths were developed, optimised and verified based on the previous designs and the determined heating and cooling method [1]. The digital image correlation (DIC) system was adopted to record strain fields of a specimen throughout the deformation history. Material constants in constitutive equations were determined from the formability test results of AA6082 for the prediction of forming limits of alloys under hot stamping conditions. This research, for the first time, enabled forming limit data of an alloy to be generated at various temperatures, strain rates and strain paths and forming limits to be predicted under hot stamping conditions.
Issue Date: 1-Jan-2017
Date of Acceptance: 24-Nov-2016
URI: http://hdl.handle.net/10044/1/52731
DOI: 10.1016/j.ijmecsci.2016.11.022
ISSN: 0020-7403
Publisher: Elsevier
Start Page: 149
End Page: 158
Journal / Book Title: International Journal of Mechanical Sciences
Volume: 120
Issue: 1
Copyright Statement: © 2016 Elsevier Ltd. 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: Commission of the European Communities
Funder's Grant Number: NMP3-SE-2013-604240
Keywords: Science & Technology
Technology
Engineering, Mechanical
Mechanics
Engineering
Sheet metal forming
Hot stamping
Forming limit diagram (FLD)
Biaxial testing
Formability prediction
ALUMINUM-MAGNESIUM ALLOY
SOLUTION HEAT-TREATMENT
FORMING LIMIT DIAGRAMS
STRAIN-PATH CHANGES
ELEVATED-TEMPERATURES
TENSILE TEST
DEFORMATION
SPECIMEN
BEHAVIOR
NECKING
Science & Technology
Technology
Engineering, Mechanical
Mechanics
Engineering
Sheet metal forming
Hot stamping
Forming limit diagram (FLD)
Biaxial testing
Formability prediction
ALUMINUM-MAGNESIUM ALLOY
SOLUTION HEAT-TREATMENT
FORMING LIMIT DIAGRAMS
STRAIN-PATH CHANGES
ELEVATED-TEMPERATURES
TENSILE TEST
DEFORMATION
SPECIMEN
BEHAVIOR
NECKING
0905 Civil Engineering
0910 Manufacturing Engineering
0913 Mechanical Engineering
Mechanical Engineering & Transports
Publication Status: Published
Online Publication Date: 2016-11-26
Appears in Collections:Mechanical Engineering
Dyson School of Design Engineering
Faculty of Engineering