Bragg-edge elastic strain tomography

No Thumbnail Available
Journal Title
Journal ISSN
Volume Title
Engineers Australia
Time-of-flight neutron imaging has now progressed to the point where high-resolution energy-resolved imaging is possible. Among many other applications, this technology allows the imaging of elastic strain fields within polycrystalline solids using a geometry identical to a traditional radiograph. 3D strain tomography from measurements such as these has been a current topic of research over the past decade. The authors recently solved this tomography problem and provided a reconstruction algorithm for the set of all systems subject to external loads in the absence of residual or eigenstrain. In this paper we provide an overview of the recent experiment carried out at the J-PARC pulsed neutron source in Japan focused on demonstrating this algorithm. This now represents the first-ever practical demonstration of Bragg-edge neutron transmission strain tomography in a non-axisymmetric system. The results of the experiment are presented along with the validation of the reconstructed field through Digital Image Correlation and traditional constant wavelength neutron strain scanning within the Australian Centre for Neutron Scattering at ANSTO. An outlook on potential strategies for reconstruction in the general case is also provided. © 2017 Engineers Australia
Strains, Stresses, Neutrons, Neutron diffraction, Algorithms, Tomography
Wensrich, C. M., Gregg, A. W. T., Hendriks, J. N., Aggarwal, A. S., Tremsin, A. S., Shinohara, T., Luzin, V., Meylan, M. H., Kisi, E. H. & Kirstein, O. (2017). Bragg-edge elastic strain tomography. Paper presented to the 9th Australasian Congress on Applied Mechanics (ACAM9), University of NSW, Sydney, 27-29 November 2017. In Prusty, G. & Paradowska, A. (eds) 9th Australasian Congress on Applied Mechanics (ACAM9), University of NSW, Sydney, 27-29 November 2017, (pp. 765-772). Retrieved from: