Skip to main content Accessibility help
×
Home

Riveted patch repairs for helicopter tail drive shafts with battle damage

  • J. Wang (a1), A. A. Baker (a1) (a2) (a3) and D. Bitton (a2) (a3)

Abstract

The ability to repair battle damage in a helicopter tail drive shaft (TDS) caused by small arms fire is a very important capability. A successful repair will enable the helicopter to continue its mission or at least allow it to return safely to base. This paper describes assessment of conventional and novel repair techniques using riveted metallic patches to restore the balance and strength of a damaged TDS. Analytical approaches are provided for the design of the repair. Modal analyses indicated that the effect of repair on change of the natural frequency of the TDS was negligible. An experimental testing program was conducted to validate the proposed repair methods. It has been demonstrated that the proposed repair methods achieved sufficient balance restoration by a defined repair procedure, assuming the unbalance could not be measured during a repair in the field. The conventional thin, single aluminium sheet, riveted repair significantly restored static strength. However, it only gave a fatigue life of 15hrs, and thus the repaired shaft may only be used for limited time for a military mission. The improved thick, two-half aluminium shell, riveted repair had sufficient static strength and met the 100-hour fatigue requirement.

Copyright

Corresponding author

References

Hide All
1. Wang, J. and Baker, A.A. Aspects of battle damage repair of helicopter structures, Aeronaut J, 2010, 114, (1155), Royal Aeronautical Society, London, UK.
2. Li, H.C.H, Wang, J and Baker, A.A. Rapid composite bonded repair for helicopter tail shafts, Composites Part B, 2012, 43, pp 15791585.
3. House, T.L. Approaches to combat damage repair. AGARD Combat Damage Tolerance and Repair of Aircraft Structures, pp 110, AGARD Report 667, 1978.
4. Rao, J.S. and Dukkipati, R.V. Mechanism and machine theory, Wiley Eastern Limited. ISBN 81-224-0105, 1989.
5. Burdett Engineering Dynamic Balancing Pty Ltd, 36 Clarice Rd, Box Hill, Australia.
6. Stang, A.H., Ramberg, W. and Back, G. Torsion tests of tubes, NACA Report 601, 1937.
7. Metals Handbook, Vol.2. Properties and selection: Nonferrous alloys and special-purpose materials, ASM International 10th ed, 1990.
8. Matweb. www.matweb.com

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed