X-Ray Stress Analysis of Nickel-Plated Components Using Different Radiation Wavelengths

1985 ◽  
Vol 29 ◽  
pp. 49-55 ◽  
Author(s):  
R. H. McSwain ◽  
E. B. S. Pardue ◽  
R. W. Hendricks ◽  
M. V. Mathis
Keyword(s):  
Residual Stress ◽  
Stress Analysis ◽  
The State ◽  
Nickel Plating ◽  
Load Bearing ◽  
X Ray ◽  
Stress Gradients ◽  
State Of Stress ◽  
Stress Analyses

X-ray stress analyses were performed on seven (7) nickel-plated camshafts from helicopter transmissions. The purpose of this investigation was to determine if this residual stress technique was useful in determining the state of stress in load-bearing plated surfaces of critical reworked aircraft components. Specifically, it was desired to characterize six different stages of nickel plating processing. These were: as-plated, plated and baked, machined, machined and baked, ground, and ground and baked. Three different radiation wavelengths with different penetrations were used In this investigation. CrKα , CoKα , and CuKα, radiations were each used on all of the camshafts. These wavelengths were selected to determine if there were stress gradients in the plated layers. This paper presents and discusses the results of these studies.

An XRPD Investigation of a Face-Centered Cubic Metallic Plating

1986 ◽  
Vol 1 (2) ◽  
pp. 22-27 ◽  
Author(s):  
Clay Olaf Ruud ◽  
Robin J. McDowell ◽  
Daniel J. Snoha
Keyword(s):  
Residual Stress ◽  
Elastic Strain ◽  
Intensity Variation ◽  
Face Centered Cubic ◽  
Nickel Plating ◽  
Polycrystalline Nickel ◽  
X Ray ◽  
Position Sensitive ◽  
Face Centered ◽  
Crystallographic Planes

AbstractInternal elastic strain (i.e., residual stress) and the diffracted X-ray intensity variation over several orientations of crystallites with respect to the specimen surface were investigated as a means of differentiating two qualities of polycrystalline nickel plating. A unique instrument based upon a position-sensitive scintillation X-ray detector was used to apply all of the techniques commonly applied to X-ray stress analysis in this investigation. It was concluded that residual stress measurements did not provide a clear distinction between the two specimens, but comparison of the relative intensities diffracted from crystallographic planes at certain orientations with the surface did provide a distinction.

Revision and extension of the standard laboratory technique for X-ray diffraction measurement of residual stress gradients

2007 ◽  
Vol 40 (4) ◽  
pp. 675-683 ◽  
Author(s):  
Cristy L. Azanza Ricardo ◽  
Mirco D'Incau ◽  
Paolo Scardi
Keyword(s):  
Residual Stress ◽  
Hole Drilling ◽  
Al Alloy ◽  
Diffraction Measurement ◽  
X Ray Diffraction ◽  
Surface Residual Stress ◽  
X Ray ◽  
Stress Gradients ◽  
Layer Removal ◽  
Removal Technique

A new procedure is proposed to determine sub-surface residual stress gradients by laboratory X-ray diffraction measurements at different depths using a chemical layer-removal technique. The standard correction algorithm for stress relaxation due to layer removal is improved by including corrections for X-ray absorption, and by the addition of constraints imposed by the mechanical equilibrium conditions. Besides correcting the data,i.e.providing more reliable through-thickness residual stress trends, the proposed procedure also provides an elastically compatible and plausible estimate of the residual stress inside the component, well beyond the measured region. The application of the model is illustrated for a set of Al-alloy components shot-peened at different Almen intensities. Results are compared with those given by `blind hole drilling', which is an independent and partly destructive method.

X-ray Residual Stress Analysis of Zn-Ni Alloy Electroplating Layers

1989 ◽  
Vol 33 ◽  
pp. 171-175
Author(s):  
Toshihiko Sasaki ◽  
Makoto Kuramoto ◽  
Yasuo Yoshioka
Keyword(s):  
Residual Stress ◽  
Corrosion Resistance ◽  
Stress Analysis ◽  
Stress Measurement ◽  
Thin Layers ◽  
High Corrosion Resistance ◽  
Ray Method ◽  
X Ray ◽  
Ni Alloy ◽  
Residual Stress Analysis

Zn-Ni-alloy electroplated steels are one of the surface-treated materials with a high corrosion resistance and are mostly used for automobiles. It is said that the corrosion resistance is more than four times as great as that of Zn-plated steels. Concerning x-ray stress measurement, Kyono et al reported the result of measurement on y (552) planes and showed that the sin2φ diagram was severely curved.X-ray stress analysis in surface-treated materials will become more important. Some problems, however, remain to be studied when we apply the x-ray method to thin layers. For example, the effective x-ray penetration depth may be different from that in ordinary materials. And complex gradients of stresses and compositions may exist.

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