Sub-Surface Residual Stress Measurements by Means of Neutron Diffraction: Aluminum, Steel, and Depleted Uranium

1986 ◽  
pp. 535-546
Author(s):  
H. J. Prask ◽  
C. S. Choi
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Depleted Uranium ◽  
Surface Residual Stress ◽  
Stress Measurements

Possible Standard Specimens for Neutron Diffraction Residual Stress Measurements

1994 ◽  
Vol 376 ◽  
Author(s):  
P.C. Brand ◽  
H.J. Prask ◽  
J. Blackburn ◽  
R.J. Fields ◽  
T.M. Proctor
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Materials Science ◽  
Stress Measurement ◽  
High Strength ◽  
Surface Residual Stress ◽  
Stress Measurements ◽  
Standard Specimens ◽  
Materials Science And Engineering ◽  
Stress States

ABSTRACTIncreasingly, sub-surface residual stress measurements by means of neutron diffraction are being conducted at various laboratories around the world. Unlike X-ray diffraction residual stress measurement setups, neutron instruments in use worldwide vary widely in design, neutron flux, and level of dedication towards residual stress measurements. Although confidence in the neutron technique has increased within the materials science and engineering communities, no demonstration of standardization or consistency between laboratories has been made. One of the steps in the direction of such standardization is the development of standard specimens, that have well characterized residual stress states and which could be examined worldwide.In this paper we will examine two options for a neutron stress standard specimen. 1) A steel ring-plug specimen with very well defined diametrical interference. 2) A spot weld in a High Strength Low Alloy steel disk. The results of neutron residual stress measurements on these specimens will be discussed and conclusions as to their usefulness as neutron stress standards will be presented.

Residual Stress Measurements in Thick Structural Weldments by Means of Neutron Diffraction*

2000 ◽  
Vol 347-349 ◽  
pp. 658-663 ◽  
Author(s):  
Carsten Ohms ◽  
Anastasius Youtsos ◽  
P. v.d. Idsert ◽  
Th. Timke
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Stress Measurements

G030031 Internal Residual Stress Measurements of Aluminum Alloy Castings Using Neutron Diffraction

2011 ◽  
Vol 2011 (0) ◽  
pp. _G030031-1-_G030031-5
Author(s):  
Yumi KUBOTA ◽  
Jun KUBO ◽  
Keitaro ISHIDA ◽  
Akinori OKADA ◽  
Minoru YOSHIDA ◽  
...  
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Neutron Diffraction ◽  
Stress Measurements ◽  
Alloy Castings

Diffraction Peak Displacement in Residual Stress Samples Due to Partial Burial of the Sampling Volume

1997 ◽  
Vol 30 (4) ◽  
pp. 449-455 ◽  
Author(s):  
S. Spooner ◽  
X.-L. Wang
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Sample Surface ◽  
Diffraction Peak ◽  
Surface Measurement ◽  
Surface Residual Stress ◽  
Peak Displacement ◽  
Near Surface ◽  
Sampling Volume ◽  
Beam Collimation

Near-surface measurement of residual strain and stress with neutron scattering complements and extends the surface residual stress measurements by X-ray diffraction. However, neutron diffraction measurements near surfaces are sensitive to scattering volume alignment, neutron beam wavelength spread and beam collimation and, unless properly understood, can give large fictitious strains. An analytic calculation and a numerical computation of neutron diffraction peak shifts due to partial burial of the sampling volume have been made and are compared with experimental measurement. Peak shifts in a strain-free nickel sample were determined for conditions where the sample surface is displaced so that the scattering gage volume is partially buried in the sample. The analytic and numerically computed peak shifts take into account the beam collimation, neutron source size, monochromator crystal mosaic spread and the collection of diffracted intensity with a linear position-sensitive counter.

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