Cavitation Peening of Hydraulic Tubes for Fatigue Improvement

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$79,979.00
Award Year:
2009
Program:
SBIR
Phase:
Phase I
Contract:
N68335-09-C-0484
Agency Tracking Number:
N092-120-0286
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
ORMOND, LLC
4718 B Street NW Suite 104, Auburn, WA, 98001
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
030321009
Principal Investigator:
Tom Butler
Co-Founder
(253) 852-1298
tomb@ormondllc.com
Business Contact:
Tom Butler
Co-Founder
(253) 852-1298
tomb@ormondllc.com
Research Institution:
n/a
Abstract
In order to reduce weight and improve performance, many new aircraft designs are using titanium hydraulic tubing because of it's high strength to weight ratio and high pressure rating. Higher hydraulic pressures enable the use of small and lighter actuators, allowing further reductions in weight. A modern performance rotorcraft, such as the V-22 or the new CH-53K, can have as many as 500 hydraulic tubes, so low weight tubing becomes a critical requirement. However, the titanium hydraulic tubing has proved to be sensitive to very small surface flaws in lab tests. Scratches as shallow as 0.004" have been shown to cause failure in less than 50,000 cycles in the lab - or as little as 40 flight hours! The cavitation peening technology proposed in this project would make the tubing more robust and forgiving of flaws by inducing residual compressive stresses that are deeper than the anticipated flaws. Preliminary tests have demonstrated the process can dramatically increase notched fatigue life by more than 20 times at a projected cost of less than $50 per tube. The proposed project will build on the initial testing to demonstrate feasibility to the Primes and other stakeholders.

* information listed above is at the time of submission.

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