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Validation Device for Cold Expanded Holes

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA8117-14-C-0023
Agency Tracking Number: F141-207-2203
Amount: $150,000.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: AF141-207
Solicitation Number: 2014.1
Solicitation Year: 2014
Award Year: 2015
Award Start Date (Proposal Award Date): 2014-10-08
Award End Date (Contract End Date): 2015-04-24
Small Business Information
130 North Main Street Suite 600
Butte, MT 59701-
United States
DUNS: 836287680
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Stephen Galbraith
 Principal Investigator
 (406) 497-5223
Business Contact
 Lawrence Farrar
Title: President&CEO
Phone: (406) 497-5252
Research Institution

ABSTRACT: Resodyn Corporation proposes to develop a portable, cost effective, near-surface residual stress measuring tools based on electromagnetic principles. Resodyn Corporation has patented technology developed for validating cold expanded button head rivet holes.The first application in Phase I is to apply this technology to countersunk cold expanded rivet holes in 7075 aluminum. In Phase II, probes will be developed for all of the common hole sizes of interest to the Air Force, and additional evaluation algorithms will be developed for other alloys such as 2024 aluminum and titanium. At the end of Phase II, field tools will be available for evaluation at Tinker AFB. The proposed work will include custom sensors, proprietary detection circuitry (patent pending), residual stress, strain and cold work studies, and correlating algorithms. Extending the technology to other surface stress processes such as peening on fan and compressor blades is also proposed for Phase II. BENEFIT: An operational need exists for a non-destructive method that can quantify the effectiveness of the cold expanded hole process. When the correct amount of residual stress is induced around a cold expanded rivet hole, fatigue life is enhanced up to 20,000 hours. However, because there is no method to guarantee, 100%, that the correct amount of residual compressive stress was created, the process cannot be given credit in design calculations. It is presently done to provide un-credited safety margin. The proposed validation device for cold expanded holes will provide 100% inspection and thus enable the design credit.

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

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