Cavitation Peening of Carburized Gears for Improved Fatigue Resistance

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-07-C-0357
Agency Tracking Number: N061-047-0737
Amount: $749,957.00
Phase: Phase II
Program: SBIR
Awards Year: 2007
Solicitation Year: 2006
Solicitation Topic Code: N06-047
Solicitation Number: 2006.1
Small Business Information
4718 B Street NW Suite 104, Auburn, WA, 98001
DUNS: 030321009
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Tom Butler
 (253) 852-1298
Business Contact
 Dan Alberts
Title: Co-Founder
Phone: (253) 854-0796
Research Institution
Cavitation peening is a novel method of inducing deep residual compressive stresses in metal components to enhance fatigue life and improve damage tolerance. The process involves sweeping ultra-high pressure waterjets over the surface of the part to be peened so that the cavitation bubbles form and collapse on the workpiece. The shock of the collapsing bubbles causes the formation of beneficial residual compressive stresses. Measurements of these stresses has shown that they extend much deeper into the material than is possible to achieve with conventional shot peening. Phase I results showed that the process works very well with carburized gears, improving the bending fatigue endurance limit from 90,000 psi to 135,000 psi stress level. The Phase II program proposes to build on this success by peening carburized gears for the V-22 program and quantifying the improved fatigue life. This low-cost peening method could improve transmission reliability by increasing fatigue life and reducing notch sensitivity of highly stressed transmission components. Success in this area will likely lead to other applications for the process.

* Information listed above is at the time of submission. *

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