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Non-destructive Depth Dependent Stress Monitor

Award Information

Department of Defense
Air Force
Award ID:
Program Year/Program:
1997 / SBIR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
Solicitation Number:
Small Business Information
Advanced Technologies/Laboratories Intl
Advanced Technologies/Lab Intl 20010 Century Blvd, Ste 500 Germantown, MD 20874 0111
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Woman-Owned: Yes
Minority-Owned: Yes
HUBZone-Owned: No
Phase 2
Fiscal Year: 1997
Title: Non-destructive Depth Dependent Stress Monitor
Agency / Branch: DOD / USAF
Contract: N/A
Award Amount: $589,927.00


Aircraft landing gear, and wheels in particular, are subjected to heavy loads during service. Controlled surface compressive stresses help to improve the fatigue life by reducing the probability of crack initiation and propagation from the wheel surface. Manufacturers such as Allied Signal will induce a surface compressive stress by either shot peening or roll burnishing. Acoustic and magnetic methods for determining stress by either shot peening or roll burnishing. Acoustic and magnetic methods for determining stress are difficult due to numerous microstructure parameters which alter the propagating wave. X-ray diffraction provides a direct measure of the residual strain independent of other microstructure properties, but is typically limited to the first 30 um of depth. Traditional four circle scanning diffractometers for stress analysis are very slow, and ill suited for manufacturing environments. ATMI in collaboration with Proto Manufacturing, and Allied Signal Aircraft Landing Systems, proposes to develop a rapid x-ray stress technique capable of rapid depth dependent stress monitoring. The technique will utilize a novel dual (short and long) wavelength z-radiation source applied to an existing commercial high speed fiber-optic/x-ray stress analyzer manufactured by Proto. In Phase II a beta site system will be tested Allied Signal's manufacturing facility.

Principal Investigator:

David Kurtz

Business Contact:

Small Business Information at Submission:

Advanced Technology Materials
7 COMMERCE DR Danbury, CT 06810

Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No