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Investigation of Residual Stresses in a Sleeve Coldworked Lug Specimen by Neutron and X-ray Diffraction

Published online by Cambridge University Press:  06 March 2019

R. Lin ,
B. Jaensson ,
T. M. Holden ,
R. B. Rogge  and
J. H. Root
R. Lin
Affiliation:
AECL Research, Chalk River, OntarioCanada
B. Jaensson
Affiliation:
AECL Research, Chalk River, OntarioCanada
T. M. Holden
Affiliation:
AECL Research, Chalk River, OntarioCanada
R. B. Rogge
Affiliation:
Uppsala University, NyköpingSweden
J. H. Root
Affiliation:
Saab-Scania AB, LinköpingSweden
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Extract

Sleeve coldworking (SCW) is a mechanical process used in the aircraft industry to strengthen fastener holes of structural parts. By cold-expanding the holes, compressive residual stresses and a high dislocation density are introduced around the holes, the effect of which is to counteract the initiation and propagation of fatigue cracks and thus increase the fatigue life of the parts. The knowledge of residual stress due to SCW is therefore crucial for assessing the fatigue properties of a treated part. In this study, residual stresses were investigated, by employing neutron and X-ray diffraction methods, in a lug specimen that was sleeve coldworked and fatigued.

The specimen had been used for testing the influence of the SCW process on fatigue life and crack propagation behaviour under constant amplitude or variable amplitude cyclic loading.

Type
V. Residual Stress, Crystallite Size and rms Strain Determination by Diffraction Methods
Information
Advances in X-Ray Analysis , Volume 38: Forty-third Annual Conference on Applications of X-ray Analysis , 1994 , pp. 455 - 461
Copyright
Copyright © International Centre for Diffraction Data 1994

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References

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