Precise Determination of Residual Stresses in Large Specimens by Neutron Diffraction

Thilo Pirling; Darren J. Hughes; Jeremy S. Robinson

doi:10.4028/www.scientific.net/MSF.652.80

Paper Titles

Residual Strain Profiles in Alumina-Zirconia Ceramic Composites
p.57

Measuring Type II Stresses Using 3DXRD
p.63

Grain Tracking at the High Energy Materials Science Beamline of the Petra III Synchrotron Radiation Source
p.70

Full Depth-Resolved Strain Mapping of a Three-Pass Slot Weld Specimen in Austenitic Stainless Steel Using the Spiral Slit Technique
p.74

Precise Determination of Residual Stresses in Large Specimens by Neutron Diffraction
p.80

Kowari - OPAL's New Stress Diffractometer for the Engineering Community: Capabilities and First Results
p.86

A Challenge for a High-Resolution Ag-In-Cd Decoupler in Intensified Short-Pulsed Neutron Source
p.92

Aspire to Become TAKUMI - TAKUMI Present Status and Research Topics -
p.99

First Results from the VULCAN Diffractometer at the SNS
p.105

HomeMaterials Science ForumMaterials Science Forum Vol. 652Precise Determination of Residual Stresses in...

Precise Determination of Residual Stresses in Large Specimens by Neutron Diffraction

Abstract:

Experimental errors in neutron residual strain imaging are often underestimated, mis-understood or simply ignored. The choice of beam defining optics can play a large role in the magnitude of these errors. In this paper we show that the use of a traditional slit beam defining system with large specimens can lead to several sources of errors. Large specimens usually require necessarily large distances between the slits and the instrument reference point (gauge volume). At large distances, the slit system can lead to significant underestimation of the residual strain magnitude as well as poor definition of the gauge volume. We show that for large specimens, the use of radial focussing collimators reduces these effects, leading to significant improvement in measurement reliability. Specifically, we show application of radial collimators at the SALSA instrument of the Institut Laue Langevin neutron source in Grenoble, France.

You might also be interested in these eBooks

Mechanical Stress Evaluation by Neutrons and Synchrotron Radiation

View Preview

Info:

Periodical:

Materials Science Forum (Volume 652)

Pages:

80-85

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.652.80

Citation:

Cite this paper

Online since:

May 2010

Authors:

Thilo Pirling, Darren J. Hughes, Jeremy S. Robinson

Keywords:

Measuring Error, Neutron Stress Determination, Radial Collimator

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

References

[1] ISO/TTA, Polycrystalline materials - Determination of residual stresses by neutron diffraction. Technology trends assessment, International Standardisation Organisation, (2001).

Google Scholar

[2] CEN/TC 138: Standard Test Method For Determining Residual Stresses By Neutron Diffraction, (2003).

Google Scholar

[3] First Impressions of SALSA: The New Engineering Instrument at ILL. D. J. Hughes, G. Bruno, T. Pirling and P. J. Withers. Neutron News 17: 3, 28-32 (2006).

DOI: 10.1080/10448630600837549

Google Scholar

[4] T. Pirling, G. Bruno, and P.J. Withers, SALSA - A New Instrument for Strain Imaging in Engineering Materials & Components. Mat. Sci. Eng. A, Vol. 437 (1), (2006), pp.139-144.

DOI: 10.1016/j.msea.2006.04.083

Google Scholar

[5] T. Pirling, Neutron strain scanning at interfaces: Optimized beam optics to reduce the surface effect; Materials Science Forum Vols. 347-349 (2000) pp.206-211.

DOI: 10.4028/www.scientific.net/msf.347-349.107

Google Scholar

[6] Residual Stress in 7449 Aluminium Alloy Forgings. J. S. Robinson, S. Hossain, C. E. Truman, E. C. Oliver, D. J. Hughes, R.C. Wimpory and M. E. Fox. in press Materials Science & Engineering A (2009).

DOI: 10.1016/j.msea.2009.12.022

Google Scholar