Hostname: page-component-586b7cd67f-r5fsc Total loading time: 0 Render date: 2024-11-22T06:15:57.697Z Has data issue: false hasContentIssue false
  • English
  • Français

Fatigue detection in structural elements (bleeding structures)

Published online by Cambridge University Press:  04 July 2016

E. P. Donald
E. P. Donald*
Affiliation:
British Aerospace Dynamics Group
Get access Rights & Permissions [Opens in a new window]

Extract

Fatigue is a problem which all designers have to face. If they are starting on the design of an aeroplane, they will work out all the high loading cases first, make sure that the design will be good enough to meet them, then they will turn their thoughts to the survival of the proposed structure within the lower stress levels of everyday operations.

Some parts may see one cycle, some hundreds, many will see thousands, some millions and millions. All should function without cracking from fatigue.

If fatigue cracks do appear after some time, this indicates that while the design was reasonably close to optimum, it needs a little more material adding locally. The operator will probably groan at the cost and disruption the beefing-up operation will require, and the designer will be tempted to overdesign in the first place to avoid this situation.

Type
Research Article
Information
The Aeronautical Journal , Volume 83 , Issue 821 , May 1979 , pp. 188 - 193
Copyright
Copyright © Royal Aeronautical Society 1979 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Ramsden, J. M. The geriatric jet problem. Flight International, 2nd October 1977.Google Scholar
2. Donald, E. P. Detection of fatigue in engineering fastening elements, Pat 1417108. Pat Off, 1972.Google Scholar
3. Donald, E. P. Preliminary tests on bleeding bolts. BAe, 1978.Google Scholar
4. Winn, A. Tight control for controlled tightness. Engineering Today, 5th June 1978.Google Scholar
5. Irving, R. R. Who knows how tight is tight? Iron Age, 3rd October 1968.Google Scholar
6. Smith, R. Manual of Light Prod Eng, Vol 1. Business Books, 1967.Google Scholar
7. Gordon, J. E. The New Science of Strong Materials. Penguin, 1976.Google Scholar
8. Heywood, R. B. Designing Against Fatigue. Chapman & Hall, 1962.Google Scholar
9. Staedel, W. Fatigue strength of screws. Tech Hoch, Darmstadt, 1933.Google Scholar
10. Erker, A. Design of screw fastenings subject to repeated stresses. ASME & Inst ME International Fatigue Conference, 1956.Google Scholar
11. Riches, D. M. An investigation into the effects of vibration on threaded fasteners. ST 13394, BAC, 1975.Google Scholar
12. Ball, J. An investigation into the torque-preload characteristics of threaded fasteners. ST 16599, BAC, 1976.Google Scholar