Cavitation Peening of Aluminum Fastener Holes In-Situ

Award Information
Agency:
Department of Defense
Branch
n/a
Amount:
$79,978.00
Award Year:
2011
Program:
SBIR
Phase:
Phase I
Contract:
N68335-11-C-0234
Award Id:
n/a
Agency Tracking Number:
N111-012-0763
Solicitation Year:
2011
Solicitation Topic Code:
N111-012
Solicitation Number:
2011.1
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
Co-Founder
(253) 852-1298
tomb@ormondllc.com
Business Contact:
Tom Butler
Co-Founder
(253) 852-1298
tomb@ormondllc.com
Research Institute:
Stub




Abstract
Aging aircraft experience fatigue cracking from stress concentrations around rivet holes. Current best practice is to pull an oversized mandrel through the hole to induce beneficial residual compressive stresses and this improves fatigue life significantly. However, the benefit is reduced for chamfered rivet holes, where the compressive stresses are lower. The goal of this proposal is to use cavitation peening to induce deep, high magnitude residual compressive stresses around the hole and in the chamfered area, thereby improving fatigue life. The cavitation peening process currently uses a high pressure jet to sweep over the surface of the part while it is submerged in a water tank. This project will modify the technology so the part does not have to be submerged in a water tank so large structures can be cavitation peened. The cavitation peening equipment would be mounted on a roll around cart and the peening nozzle clamped to the surface to be peened. The process will be very inexpensive and clean with no shot or risk of foreign object damage. The system would be extremely versatile and could be used for a wide variety of applications, not just rivet holes.

* information listed above is at the time of submission.

Agency Micro-sites


SBA logo

Department of Agriculture logo

Department of Commerce logo

Department of Defense logo

Department of Education logo

Department of Energy logo

Department of Health and Human Services logo

Department of Homeland Security logo

Department of Transportation logo

Enviromental Protection Agency logo

National Aeronautics and Space Administration logo

National Science Foundation logo
US Flag An Official Website of the United States Government