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Fatigue of Unmachined Aluminium Alloy Extrusions

Published online by Cambridge University Press:  07 June 2016

K. W. Gunn  and
A. R. Woodward
K. W. Gunn
Affiliation:
Aluminium Laboratories Limited
A. R. Woodward
Affiliation:
Aluminium Laboratories Limited
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Summary

The fatigue properties of unmachined extrusions of high-strength aluminium-copper alloys are known to be lower than those of conventional fully-machined test pieces. Work described in this note has shown that the removal of a layer of metal 0·025 in. thick from the surface of B.S. L65-type extrusions results in an increase in fatigue properties to values approaching those obtained from the conventional laboratory test pieces. Because the removal of material from the surface is not always a practical proposition, other methods of improving strength have been examined and the effect of surface compressive stresses has been shown to be beneficial. Sufficient compressive stress can be induced by surface-rolling to increase the fatigue properties to those of conventional specimens, but this method can only be easily applied to round sections and it is suggested that shot-peening or vapour-blasting could be used for more complicated sections.

Type
Research Article
Information
Aeronautical Quarterly , Volume 13 , Issue 3 , August 1962 , pp. 271 - 274
Copyright
Copyright © Royal Aeronautical Society. 1962

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References

1. Forrest, G. and Woodward, A. R. Report on Fatigue of Complete Extruded Sections. Ministry of Supply S. & T. Memo. No. 10/50, 1950.Google Scholar
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