Influences of residual stresses and initial distortion on springback prediction of 7B04-T651 aluminium plates in creep-age forming
File(s)
Accepted version
Author(s)
Lam, ACL
Shi, Z
Lin, J
Huang, X
Type
Journal Article
Abstract
Springback behaviour of surface-machined 7B04-T651 aluminium plates of 3–8 mm thicknesses, creep-age formed under a single curvature bending radius of 1200 mm, has been experimentally investigated. The surface residual stress levels of the plates have been measured and the typical residual stress distribution and values in 7000-series aluminium alloys have been reviewed and analysed. Finite element models have been developed to simulate creep-age forming (CAF) processes and predict the amount of springback in the physical CAF test. Machining-induced residual stresses and distortion have been considered in the finite element models. This paper presents a first attempt to study the effect of machining-induced residual stresses on the errors of springback prediction in CAF of 7000-series aluminium alloy panel components. It has been found that the effect of machining-induced residual stresses on the accuracy of springback prediction is related to the initial loading stress levels in CAF. In addition, when the initial distortion conforms to the loading curvature, an opposing effect on the material’s deformation is observed.
Date Issued
2015-11-01
Date Acceptance
2015-09-09
Citation
International Journal of Mechanical Sciences, 2015, 103 (1), pp.115-126
ISSN
0020-7403
Publisher
Elsevier
Start Page
115
End Page
126
Journal / Book Title
International Journal of Mechanical Sciences
Volume
103
Issue
1
Copyright Statement
© 2015, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor
AVIC Manufacturing Technology Institute
First Aircraft Institute
Identifier
https://www.sciencedirect.com/science/article/pii/S0020740315003227
Grant Number
N/A
N/A
Subjects
Science & Technology
Technology
Engineering, Mechanical
Mechanics
Engineering
Creep-age forming
Machining-induced residual stress
Initial distortion
Aluminium plates
Springback prediction errors
ALLOY
AIRCRAFT
PANELS
0905 Civil Engineering
0910 Manufacturing Engineering
0913 Mechanical Engineering
Mechanical Engineering & Transports
Publication Status
Published
Date Publish Online
2015-09-18