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Proceedings Paper

A look ahead in residual stress analysis: the strain imager at the ILL
Author(s): Giovanni Bruno; Thilo Pirling; S. Rowe; W. Hutt; P. J. Withers; Colin J. Carlile
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Paper Abstract

Neutron diffraction is now established as a very reliable bulk and surface technique, with draft industrial standards in place and industrial take up increasing. The Strain Imager will be the new instrument for residual stress analysis of engineering components at the ILL, the worldTs most powerful steady state neutron source. Thanks to the improved flux of the new m = 2 supermirror guide (gaining a factor 3 to 5 on the existing guide), and improved optics the Strain Imager will increase the range of potential engineering applications by improving the resolution and shortening the measurement times. It is designed to allow measurements in components up to 2 metres in length and more than 500 kilogram weight (at a depth up to several centimetres), yet having a spatial resolution better than 0.5x0.5x0.5 mm3 . On the other hand, precise surface measurements will be standard, owing to the presence of collimators and to a positioning precision better than 50 μm. Special features include: a) the sample stage O the first to use a Stewart platform allowing 6 axis sample movement working in sample centric co-ordinates; b) a double- focusing bent Si monochromator, with very good resolution, very high intensity and a variable take-off angle from 55° to 125°; and c) a flexible optical system for the incident and diffracted beams. It will allow the use of combinations of different collimators and variable size slits for automated definition of the gauge volume.

Paper Details

Date Published: 18 November 2002
PDF: 11 pages
Proc. SPIE 4785, Advances in Neutron Scattering Instrumentation, (18 November 2002); doi: 10.1117/12.453929
Show Author Affiliations
Giovanni Bruno, Manchester Materials Science Ctr. (United Kingdom)
Institut Laue-Langevin (France)
Thilo Pirling, Institut Laue-Langevin (France)
S. Rowe, Institut Laue-Langevin (France)
W. Hutt, Manchester Materials Science Ctr. (United Kingdom)
Institut Laue-Langevin (France)
P. J. Withers, Manchester Materials Science Ctr. (United Kingdom)
Colin J. Carlile, Institut Laue-Langevin (France)

Published in SPIE Proceedings Vol. 4785:
Advances in Neutron Scattering Instrumentation
Ian S. Anderson; Bruno Guérard, Editor(s)

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