Non-destructive Depth Dependent Stress Monitor

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: N/A
Agency Tracking Number: 32203
Amount: $589,927.00
Phase: Phase II
Program: SBIR
Awards Year: 1997
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
7 COMMERCE DR, Danbury, CT, 06810
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 David Kurtz
 (814) 235-0606
Business Contact
Phone: () -
Research Institution
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.

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

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