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Article

Energy Resolved Neutron Imaging for Strain Reconstruction Using the Finite Element Method

1
School of Mathematics and Physical Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia
2
School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia
*
Author to whom correspondence should be addressed.
Received: 4 March 2020 / Revised: 17 March 2020 / Accepted: 19 March 2020 / Published: 22 March 2020
(This article belongs to the Special Issue Neutron Imaging)
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. View Full-Text
Keywords: energy resolved neutron imaging; finite element methods; tikhonov regularisation; strain tomography energy resolved neutron imaging; finite element methods; tikhonov regularisation; strain tomography
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MDPI and ACS Style

Aggarwal, R.; Meylan, M.H.; Lamichhane, B.P.; Wensrich, C.M. Energy Resolved Neutron Imaging for Strain Reconstruction Using the Finite Element Method. J. Imaging 2020, 6, 13. https://0-doi-org.brum.beds.ac.uk/10.3390/jimaging6030013

AMA Style

Aggarwal R, Meylan MH, Lamichhane BP, Wensrich CM. Energy Resolved Neutron Imaging for Strain Reconstruction Using the Finite Element Method. Journal of Imaging. 2020; 6(3):13. https://0-doi-org.brum.beds.ac.uk/10.3390/jimaging6030013

Chicago/Turabian Style

Aggarwal, Riya, Michael H. Meylan, Bishnu P. Lamichhane, and Chris M. Wensrich 2020. "Energy Resolved Neutron Imaging for Strain Reconstruction Using the Finite Element Method" Journal of Imaging 6, no. 3: 13. https://0-doi-org.brum.beds.ac.uk/10.3390/jimaging6030013

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