Robust Methods for the Measurement of Bulk Residual Stress

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA8650-13-M-5054
Agency Tracking Number: F131-119-0237
Amount: $149,972.00
Phase: Phase I
Program: SBIR
Awards Year: 2013
Solitcitation Year: 2013
Solitcitation Topic Code: AF131-119
Solitcitation Number: 2013.1
Small Business Information
Hill Engineering, LLC
3035 Prospect Park Drive, Suite 180, Rancho Cordova, CA, -
Duns: 174410394
Hubzone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Adrian DeWald
 Managing Member
 (916) 635-5706
 atdewald@hill-engineering.com
Business Contact
 Adrian DeWald
Title: Managing Member
Phone: (916) 635-5706
Email: atdewald@hill-engineering.com
Research Institution
N/A
Abstract
ABSTRACT: Aircraft engine and structural components are being produced from forgings with increasingly complex geometries in a wide range of aerospace alloys. The forging process involves a number of steps required to attain favorable material properties (e.g., heat treatment, rapid quench, cold work stress relieving, and artificial aging). These processing steps, however, also result in the introduction of residual stress. Excessive bulk residual stresses can have negative consequences including: part distortion during machining and/or during service, reduced crack initiation life, increased crack growth rates, and an overall reduction in part life. While bulk residual stresses are often accounted for with simple approximations that ensure safety, improved understanding of bulk residual stress fields would enable higher quality design and analysis methods. This could lead to overall higher performing structure. The proposed work plan will develop improved technology for the measurement of bulk residual stress and will demonstrate the effectiveness of this approach under representative conditions. BENEFIT: The proposed residual stress measurement technology is a significant improvement that would fill a critical gap in capability for bulk residual stress measurement, enabling high-quality measurements in aerospace materials. This technology is important to the aerospace community, but is applicable to many other industries as well. For example, pressure vessels, turbines, industrial facilities, and heavy equipment all contain critical structure with significant amounts of residual stress. As design and analysis techniques evolve to incorporate residual stress effects, it is important to have residual stress measurement techniques capable of providing the necessary supporting data. The proposed technology expands residual stress measurement capability to support these important challenges.

* information listed above is at the time of submission.

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