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The Use of an Interference-Fit Bush to Improve the Fatigue Life of a Pin-Jointed Connection

Published online by Cambridge University Press:  07 June 2016

T. H. Lambert  and
R. J. Brailey
T. H. Lambert
Affiliation:
Department of Mechanical Engineering, University College London
R. J. Brailey
Affiliation:
Department of Mechanical Engineering, University College London
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Summary

The fatigue life of a pin-jointed connection can be optimised by using a moderately high degree of interference between the loading pin and plate. Where a joint has to be assembled in confined conditions, difficulty may be experienced in inserting the interference-fit pin and one possible solution is to use a pre-assembled interference-fit bush in the plate, leaving only a light interference-fit pin to be pressed in on assembly of the joint. It is shown that a relatively thick bush of diametral ratio 4/3 will give a reduction in shear stress concentration factor for the plate comparable with that obtained with a solid pin, but that maximum benefit is not obtained with a thinner bush of diametral ratio 8/7. Where thin bushes are essential in order to maintain the ultimate tensile and fatigue strengths of the plate and /or the ultimate and fatigue strengths of the pin, the shear stress concentration factor for the plate is reduced as the modular ratio of bush to plate is increased and as the interference fit of the loading pin in the bush is increased.

Type
Research Article
Information
Aeronautical Quarterly , Volume 13 , Issue 3 , August 1962 , pp. 275 - 284
Copyright
Copyright © Royal Aeronautical Society. 1962

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References

1. Jessop, H. T., Snell, C. and Holister, G. S. Photoelastic Investigation with Single Interference-Fit Pins with Load Applied (a) to Pin Only and (b) to Pin and Plate Simultaneously. Aeronautical Quarterly, Vol. IX, p. 147, May 1958.Google Scholar
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3. Lambert, T. H. and Brailey, R. J. The Influence of the Coefficient of Friction on the Elastic Stress Concentration Factor for a Pin-jointed Connection. Aeronautical Quarterly, Vol. XIII, p. 17, February 1962.Google Scholar
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