Near-Surface Residual Stress Measurements for Aerospace Structures

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA8650-13-C-5013
Agency Tracking Number: F121-112-0163
Amount: $749,998.00
Phase: Phase II
Program: SBIR
Awards Year: 2013
Solicitation Year: 2012
Solicitation Topic Code: AF121-112
Solicitation Number: 2012.1
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
 Stub
Abstract
ABSTRACT: It is widely recognized that near surface residual stresses play a significant role in fatigue performance. Tensile residual stresses are of concern because they accelerate fatigue crack initiation and fatigue crack growth relative to what would occur in the absence of residual stress. Compressive residual stresses, on the other hand, have the opposite effect and can be used to improve fatigue performance. To effectively understand and predict residual stress effects on fatigue durability or crack initiation, which accounts for the majority of the total component life under high-cycle applications, accurate and reliable residual stress data are required in the near-surface region. The proposed work plan will develop improvements to a novel near-surface residual stress measurement technique, will demonstrate the effectiveness of this measurement technique under representative conditions, and will develop technology to implement the measurement. BENEFIT: The proposed residual stress measurement method is a significant improvement to existing residual stress measurement technology and will fill a critical gap in capability for near-surface residual stress measurement, enabling high-quality measurements in the near-surface regime under conditions typical of the aerospace industry. This technology is important to many industries (e.g., aerospace, transportation, utilities, etc). Current design methods are evolving to include residual stress effects and these methods benefit from high quality residual stress data.

* information listed above is at the time of submission.

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