Abstract
Predicting the fatigue lifetime of components relies on a knowledge of the residual elastic strain present throughout the bulk of the material. Non-destructively mapping the complete strain distribution throughout large volumes presents significant practical challenges. Recently a technique known as Bragg-edge neutron transmission has been developed as a means of non-destructive bulk elastic strain evaluation. Whilst conventional radiography measures the integral absorption, Bragg-edge neutron transmission probes the average strain along the incident beam direction. A “strain radiogram” is thus a two-dimensional average projection of the strain within the sample. Here we demonstrate how strain radiograms can be used for “neutron strain tomography” and we present and contrast two different approaches to the problem of characterising spatially resolved elastic strains.
References
[1] S.Y.Zhang, E.Godfrey, W.Kockelmann, A.Paradowska, M.J.Bull, A.M.Korsunsky, B.Abbey, P.Xu, Y.Tomota, D.Liljedahl, O.Zanellato, M.Fitzpatrick, M.R.Daymond, R.M.Toda, R.A.Holt, J.Kelleher, S.Siano, J.R.Santisteban: Materials Today12 (2009) 78. 10.1016/S.1369-7021(09)70233-010.1016/S1369-7021(09)70233-0Search in Google Scholar
[2] J.Banhart, A.Borbély, K.Dzieciol, F.Garcia-Moreno, I.Manke, N.Kardjilov, A.R.Kaysser-Pyzalla, M.Strobl, W.Treimer: Int. J. Mat. Res.9 (2010) 1069. 10.1590/S0074-0276201000070000510.3139/146.110382Search in Google Scholar
[3] P.J.Withers, M.W.Johnson, J.S.Wright: Physica B292 (2000) 273–285. 10.1016/S0921-4526(00)00481-610.1016/S0921-4526(00)00481-6Search in Google Scholar
[4] J.R.Santisteban, L.Edwards, M.E.Fizpatrick, A.Steuwer, P.J.Withers: Applied Physics A74 (2002) 1433. 10.1007/s00339010124110.1007/s003390101241Search in Google Scholar
[5] J.R.Santisteban, L.Edwards, H.G.Priesmeyer, S.Vogel: Applied Physics A74 (2002) 1616. 10.1007/s00339020156210.1007/s003390201562Search in Google Scholar
[6] M.R.Daymond, M.W.Johnson, D.S.Silvia: J. Strain Anal. Eng. Des.37 (2002) 73–85. 10.1243/030932402151484410.1243/0309324021514844Search in Google Scholar
[7] M.W.Johnson, L.Edwards, P.J.Withers: Physica B234 (1997) 1141. 10.1016/S0921-4526(97)89272-110.1016/S0921-4526(97)89272-1Search in Google Scholar
[8] W.J.J.Vorster: “DPhil Thesis”, Engineering Science, Oxford (2007).Search in Google Scholar
[9] S.H.Zhang: “DPhil Thesis”, Engineeing Science, Oxford (2008).Search in Google Scholar
[10] A.M.Korsunsky, N.Baimpas, X.Song, J.Belnoue, F.Hofmann, B.Abbey, M.Xie, J.Andrieux, T.Buslaps, T.K.Neo: Acta Mater.59 (2011) 2501–2513. 10.1016/j.actamat.2010.12.05410.1016/j.actamat.2010.12.054Search in Google Scholar
[11] A.M.Korsunsky, W.J.J.Vorster, S.Y.Zhang, D.Dini, D.Latham, M.Golshan, J.Liu, Y.Kyriakoglou, M.J.Walsh: Acta Mater.54 (2006) 2101–2108. 10.1016/j.actamat.2006.01.00310.1016/j.actamat.2006.01.003Search in Google Scholar
[12] X.Song, A.M.Korsunsky: J. Appl. Mech.78 (2011) 031019. 10.1115/1.400336410.1115/1.4003364Search in Google Scholar
[13] M.Pharr, G.Humphreys: Sampling and Reconstruction, in: Physically Based Rendering: From Theory to Implementation, Morgan Kaufman (2010).Search in Google Scholar
[14] S.Timoshenko, J.N.Goodier: Theory of elasticity, Mc Graw-Hill (1970).10.1115/1.3408648Search in Google Scholar
[15] A.N.Tychonoff, V.Y.Arsenin: Solution of Ill-posed Problems, Washington: Winston and Sons. (1977).Search in Google Scholar
[16] B.Abbey, S.Y.Zhang, W.J.J.Vorster, A.M.Korsunsky: Procedia Engineering, 1 (2009) 185–188. 10.1016/j.proeng.2009.06.04310.1016/j.proeng.2009.06.043Search in Google Scholar
[17] A.S.F.Tremsin, W.B.Downing, R.G.Mildner: IEEE Trans. Nucl. Sci.52 (2005) 1739–1744. 10.1109/TNS.2005.85662110.1109/TNS.2005.856621Search in Google Scholar
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