Development of high-fidelity imaging procedures to establish the local material behavior in friction stir welded stainless steel joints
Development of high-fidelity imaging procedures to establish the local material behavior in friction stir welded stainless steel joints
Friction stir welded (FSW) 304 austenitic stainless steel (SS) joints are studied using a range of microstructural characterization techniques to identify various sub-regions across the weld. A high-resolution (HR) 2D-digital image correlation (DIC) methodology is developed to assess the local strain response across the weld surface and cross-section in the elastic regime. The HR-DIC methodology includes the stitching of multiple images, as it is only possible to partially cover the FSW region using a single camera with the high-resolution optical set-up. An image processing procedure is described to stitch the strain maps as well as strain data sets that allow full-field strain to be visualized and interrogated over the entire FSW region. It is demonstrated that the strains derived from the DIC can be associated with the local weld geometry and the material microstructure in the region of the FSW. The procedure is validated in the material elastic range and provides an important first step in enabling detailed mechanical assessments of the local effects in the FSW process.
stainless steel, friction stir welding, digital image correlation
Ramachandran, S.
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Lakshminarayanan, A.K.
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Reed, P.
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Dulieu-Barton, J.M.
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Ramachandran, S.
d2615ddf-f548-41bc-a625-c7f3c270443e
Lakshminarayanan, A.K.
329bcb82-22c1-44c1-845b-31bf31ae61b0
Reed, P.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Dulieu-Barton, J.M.
9e35bebb-2185-4d16-a1bc-bb8f20e06632
Ramachandran, S., Lakshminarayanan, A.K., Reed, P. and Dulieu-Barton, J.M.
(2019)
Development of high-fidelity imaging procedures to establish the local material behavior in friction stir welded stainless steel joints.
Metals, 9 (5), [592].
(doi:10.3390/met9050592).
Abstract
Friction stir welded (FSW) 304 austenitic stainless steel (SS) joints are studied using a range of microstructural characterization techniques to identify various sub-regions across the weld. A high-resolution (HR) 2D-digital image correlation (DIC) methodology is developed to assess the local strain response across the weld surface and cross-section in the elastic regime. The HR-DIC methodology includes the stitching of multiple images, as it is only possible to partially cover the FSW region using a single camera with the high-resolution optical set-up. An image processing procedure is described to stitch the strain maps as well as strain data sets that allow full-field strain to be visualized and interrogated over the entire FSW region. It is demonstrated that the strains derived from the DIC can be associated with the local weld geometry and the material microstructure in the region of the FSW. The procedure is validated in the material elastic range and provides an important first step in enabling detailed mechanical assessments of the local effects in the FSW process.
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metals-09-00592
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Accepted/In Press date: 21 May 2019
e-pub ahead of print date: 23 May 2019
Keywords:
stainless steel, friction stir welding, digital image correlation
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Local EPrints ID: 431392
URI: http://eprints.soton.ac.uk/id/eprint/431392
ISSN: 2075-4701
PURE UUID: d40468ab-ce68-4660-a70b-c8d5a77d4787
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Date deposited: 31 May 2019 16:30
Last modified: 16 Mar 2024 02:44
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Author:
A.K. Lakshminarayanan
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