Bragg-edge neutron transmission strain tomography for in situ loadings

C. M. Wensrich, J. N. Hendriks, A. Gregg, M. H. Meylan, V. Luzin, A. S. Tremsin

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27 Citations (Scopus)

Abstract

An approach for tomographic reconstruction of three-dimensional strain distributions from Bragg-edge neutron transmission strain images is outlined and investigated. This algorithm is based on the link between Bragg-edge strain measurements and the Longitudinal Ray Transform, which has been shown to be sensitive only to boundary displacement. By exploiting this observation we provide a method for reconstructing boundary displacement from sets of Bragg-edge strain images. In the case where these displacements are strictly the result of externally applied tractions, corresponding internal strain fields can then be found through traditional linear-static finite element methods. This approach is tested on synthetic data in two-dimensions, where the rate of convergence in the presence of measurement noise and beam attenuation is examined.

Original languageEnglish
Pages (from-to)52-58
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume383
DOIs
Publication statusPublished - 15 Sept 2016
Externally publishedYes

Keywords

  • Bragg-edge imaging
  • Neutron diffraction
  • Neutron transmission strain measurement
  • Strain tomography

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