Cavitation Peening of Hydraulic Tubes for Fatigue Improvement

Award Information
Agency:
Department of Defense
Branch
n/a
Amount:
$749,935.00
Award Year:
2010
Program:
SBIR
Phase:
Phase II
Contract:
N68335-10-C-0489
Award Id:
92668
Agency Tracking Number:
N092-120-0286
Solicitation Year:
2009
Solicitation Topic Code:
N092-120
Solicitation Number:
2009.2
Small Business Information
4718 B Street NW Suite 104, Auburn, WA, -
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
030321009
Principal Investigator:
Tom Butler
C0-Owner
(253) 852-1298
tomb@ormondllc.com
Business Contact:
Tom Butler
C0-Owner
(253) 852-1298
tomb@ormondllc.com
Research Institute:
n/a
Abstract
Aircraft use thin-walled high-strength tubing for hydraulic systems. As wall thickness is reduced to save weight, the ability of the tubing to withstand flaws, induced either in manufacturing or in service, becomes critical. High performance aircraft use titanium alloys to save weight and provide high system pressure capability. Using higher operating pressures allows actuators to be smaller and hence lighter, saving weight. However, these thin walled tubes are very susceptible to outside diameter damage in particular where even very shallow marks, 0.004"deep, have been shown to suffer substantial fatigue life reduction. The proposed solution is to make the tubing more tolerant of flaws by inducing deep residual compressive stresses using a new surface treatment process, cavitation peening. This project will develop the methods and tooling to adapt the cavitation peening technology so that it can be applied to tubing outside and inside diameters to generate high magnitude, deep and stable residual stresses. This low cost technology will add no weight to the aircraft while improving reliability and flaw tolerance. Phase I has demonstrated the benefits of the technology, improving the fatigue life of damaged tubing by a factor of 20.

* information listed above is at the time of submission.

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