Size-dependent mechanical properties in AA6082 tailor welded specimens
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
AA6082 tailor welded blanks (TWBs) produced using laser welding and friction stir welding were studied
in this paper. The nominal mechanical properties of welded AA6082 under uniaxial tension conditions
were characterised by evaluating the local properties of the base material, heat affected zone (HAZ) and
weld zone. Tensile specimens were machined in the way that the weld line lies perpendicular to the
loading axis. Three standard-sized specimens containing varying ratios of weld in the gauge region of
the specimen were used to determine the size-dependent properties of welded AA6082 in the TWBs.
A post-weld strength prediction (PWSP) model, based on the theories of plasticity, has been developed
to estimate the post-weld properties of the tailor welded specimens. The model can be used to predict
the post-weld yield strength and the global tensile behaviour of welded AA6082 specimens. Good agreements
between the modelling and the experimental results have been obtained, with the yield strength
deviation less than 6%. It was found that the yield strength increased with increasing dimensions of the
tensile specimens. The size-dependent phenomenon was studied and the complex plastic deformation
mechanisms have been found to cause the size-dependent phenomenon
in this paper. The nominal mechanical properties of welded AA6082 under uniaxial tension conditions
were characterised by evaluating the local properties of the base material, heat affected zone (HAZ) and
weld zone. Tensile specimens were machined in the way that the weld line lies perpendicular to the
loading axis. Three standard-sized specimens containing varying ratios of weld in the gauge region of
the specimen were used to determine the size-dependent properties of welded AA6082 in the TWBs.
A post-weld strength prediction (PWSP) model, based on the theories of plasticity, has been developed
to estimate the post-weld properties of the tailor welded specimens. The model can be used to predict
the post-weld yield strength and the global tensile behaviour of welded AA6082 specimens. Good agreements
between the modelling and the experimental results have been obtained, with the yield strength
deviation less than 6%. It was found that the yield strength increased with increasing dimensions of the
tensile specimens. The size-dependent phenomenon was studied and the complex plastic deformation
mechanisms have been found to cause the size-dependent phenomenon
Date Issued
2015-05-12
Date Acceptance
2015-05-01
Citation
Journal of Materials Processing Technology, 2015, 224, pp.169-180
ISSN
0924-0136
Publisher
Elsevier
Start Page
169
End Page
180
Journal / Book Title
Journal of Materials Processing Technology
Volume
224
Copyright Statement
© 2015 The Authors. This is an open access article under the CC BY-NC-ND
license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Publication Status
Published