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Updated: Oct 22, 2025

High-resolution Imaging of Nuclear Dynamics in Live Cells under Uniaxial Tensile Strain
Published on: June 2, 2019
Energy Resolved Neutron Imaging for Strain Reconstruction Using the Finite Element Method
Riya Aggarwal1, Michael H Meylan1, Bishnu P Lamichhane1
1School of Mathematics and Physical Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia.
Abstract:
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.
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