In situ 3-D observation of early strain localization during failure of thin Al alloy (2198) sheet
In situ 3-D observation of early strain localization during failure of thin Al alloy (2198) sheet
High-resolution in situ synchrotron X-ray laminography combined with digital volume correlation (DVC) is used to measure the damage and plastic strain fields ahead of a notch introduced within a 2198 Al-Cu-Li alloy sheet. Synchrotron laminography is a technique specifically developed for three-dimensional (3-D) imaging of laterally extended sheet specimens with micrometre resolution. DVC is carried out using the 3-D image contrast caused by iron-rich intermetallic particles present in the alloy. The alloy is recrystallized and tested in T8 artificial ageing condition involving relatively low work hardening. Inclined strain localization bands are shown to develop at similar to 800 mu m from the notch prior to the onset of damage. Damage in this region results mainly from the nucleation of voids on micrometric intermetallic particles and occurs at a very late stage of deformation, followed by very limited void growth. The accumulation of strain in the slanted localization band is found to be a steady process, whereas the crack propagation is a sudden process. Standard 3-D FE calculations using either von Mises plasticity or Gurson's model do not capture the plastic localization process.
synchrotron laminography, digital volume correlation, flat-to-slant ductile fracture, strain localization, al–cu–li alloy
78-91
Morgeneyer, T.F
68369393-6393-4182-8ccd-12414b6cd4b7
Taillandier-Thomas, T.
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Helfen, L.
f87be34a-12b5-448a-aa70-55af4ae05584
Baumbach, T.
3ca38554-215e-4729-bcd5-3577c8728571
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Roux, S.
2c844f76-fbba-41c6-8608-767497bd0dd9
Hild, F.
1d1fc6f9-fdf2-4469-ad06-a7f94cdbe489
May 2014
Morgeneyer, T.F
68369393-6393-4182-8ccd-12414b6cd4b7
Taillandier-Thomas, T.
723757e9-0adb-4378-be48-d732f2e6ad79
Helfen, L.
f87be34a-12b5-448a-aa70-55af4ae05584
Baumbach, T.
3ca38554-215e-4729-bcd5-3577c8728571
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Roux, S.
2c844f76-fbba-41c6-8608-767497bd0dd9
Hild, F.
1d1fc6f9-fdf2-4469-ad06-a7f94cdbe489
Morgeneyer, T.F, Taillandier-Thomas, T., Helfen, L., Baumbach, T., Sinclair, I., Roux, S. and Hild, F.
(2014)
In situ 3-D observation of early strain localization during failure of thin Al alloy (2198) sheet.
Acta Materialia, 69, .
(doi:10.1016/j.actamat.2014.01.033).
Abstract
High-resolution in situ synchrotron X-ray laminography combined with digital volume correlation (DVC) is used to measure the damage and plastic strain fields ahead of a notch introduced within a 2198 Al-Cu-Li alloy sheet. Synchrotron laminography is a technique specifically developed for three-dimensional (3-D) imaging of laterally extended sheet specimens with micrometre resolution. DVC is carried out using the 3-D image contrast caused by iron-rich intermetallic particles present in the alloy. The alloy is recrystallized and tested in T8 artificial ageing condition involving relatively low work hardening. Inclined strain localization bands are shown to develop at similar to 800 mu m from the notch prior to the onset of damage. Damage in this region results mainly from the nucleation of voids on micrometric intermetallic particles and occurs at a very late stage of deformation, followed by very limited void growth. The accumulation of strain in the slanted localization band is found to be a steady process, whereas the crack propagation is a sudden process. Standard 3-D FE calculations using either von Mises plasticity or Gurson's model do not capture the plastic localization process.
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Accepted/In Press date: 17 January 2014
e-pub ahead of print date: 25 February 2014
Published date: May 2014
Additional Information:
Brings together an international team (UK, France, Germany) and international facilities (ESRF), to perform a first-of-kind in situ fracture analysis of real aerospace alloys under laminographic X-ray imaging. Addresses fundamental and historic unknowns on the roles of microdamage and shear instability in metallics in general, and the most prevalent mode of failure in sheet aluminium for airframes. Synchrotron laminography facilitated exceptionally detailed physical analysis, whilst maintaining engineering relevance during loading. Volumetric internal strain mapping applied for first time in this context. Well cited (13 citations in 2016, and rising).
Keywords:
synchrotron laminography, digital volume correlation, flat-to-slant ductile fracture, strain localization, al–cu–li alloy
Organisations:
Engineering Science Unit
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Local EPrints ID: 383281
URI: http://eprints.soton.ac.uk/id/eprint/383281
ISSN: 1359-6454
PURE UUID: 831f427e-b472-4ede-86af-97e6bab58eab
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Date deposited: 10 Nov 2015 12:38
Last modified: 14 Mar 2024 21:40
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Contributors
Author:
T.F Morgeneyer
Author:
T. Taillandier-Thomas
Author:
L. Helfen
Author:
T. Baumbach
Author:
S. Roux
Author:
F. Hild
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