- Title
- Energy resolved neutron imaging for strain reconstruction using the finite element method
- Creator
- Aggarwal, Riya; Meylan, Michael H.; Lamichhane, Bishnu P.; Wensrich, Chris M.
- Relation
- ARC.DP170102324 http://purl.org/au-research/grants/arc/DP170102324
- Relation
- Journal of Imaging Vol. 6, Issue 3, no. 13
- Publisher Link
- http://dx.doi.org/10.3390/jimaging6030013
- Publisher
- MDPI AG
- Resource Type
- journal article
- Date
- 2020
- Description
- A novel pulsed neutron imaging technique based on the finite element method is used to reconstruct the residual strain within a polycrystalline material from Bragg edge strain images. This technique offers the possibility of a nondestructive analysis of strain fields with a high spatial resolution. The finite element approach used to reconstruct the strain uses the least square method constrained by the conditions of equilibrium. This inclusion of equilibrium makes the problem well-posed. The procedure is developed and verified by validating for a cantilevered beam problem. It is subsequently demonstrated by reconstructing the strain from experimental data for a ring-and-plug sample, measured at the spallation neutron source RADEN at J-PARC in Japan. The reconstruction is validated by comparison with conventional constant wavelength strain measurements on the KOWARI diffractometer at ANSTO in Australia. It is also shown that the addition of a Tikhonov regularisation scheme further improves the reconstruction.
- Subject
- energy resolved neutral imaging; finite element methods; tikhonov regularisation; strain tomography
- Identifier
- http://hdl.handle.net/1959.13/1455575
- Identifier
- uon:45106
- Identifier
- ISSN:2313-433X
- Rights
- This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. https://creativecommons.org/licenses/by/4.0/
- Language
- eng
- Full Text
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