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The Fatigue Properties of Z-Section Test Pieces Completely Machined from an Aluminium Alloy Extrusion Conforming to D.T.D. 364B

Published online by Cambridge University Press:  28 July 2016

G. Forrest ,
K. W. Gunn  and
A. R. Woodward
G. Forrest
Affiliation:
Aluminium Laboratories Limited, Banbury
K. W. Gunn
Affiliation:
Aluminium Laboratories Limited, Banbury
A. R. Woodward
Affiliation:
Aluminium Laboratories Limited, Banbury
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Extract

In 1949 F. H. Pollicutt, in the course of a discussion on a paper presented by P. B. Walker to the Royal Aeronautical Society, reported fatigue test results which indicated that when the aluminium alloy conforming to specification D.T.D.364 was tested, under , axial loads, in the form of Z-sections, its fatigue properties were extremely low. Z-sections with unmachined surfaces and even Z-sections with completely machined surfaces failed after short endurances at stress ranges under which small polished round test pieces would not have failed even after hundreds of millions of cycles. Pollicutt, in discussing these low values, advised that great caution should be exercised in their interpretation, warning equally against an unqualified acceptance of the testing technique and a too facile acceptance of small polished round bar test results.

Type
Technical Notes
Information
The Aeronautical Journal , Volume 57 , Issue 506 , February 1953 , pp. 103 - 107
Copyright
Copyright © Royal Aeronautical Society 1953

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References

1. Pollicutt, F. H. (1949). Discussion to paper on Fatigue of Aircraft Structures by P. B. Walker. Journal of the Royal Aeronautical Society 1949, p. 781.Google Scholar
2. Forrest, G., Gunn, K. and Woodward, A. R. The Fatigue Properties of Unmachined and Machined Extruded Sections. Ministry of Supply Scientific and Technical Memorandum No. 7/52.Google Scholar
3. Russenberger, M. (1945). A Dynamic Tension-Compression Testing Machine for the Determination of the Fatigue Limit and the Damping Capacity of Materials. Schweiz Archiv, 1945, 11 (2) 33–42.Google Scholar
4. Russell, A. E. (1949). Aircraft Materials from the Designer's Point of View. Second International Aeronautical Conference. New York, 1949, p. 231.Google Scholar