Spall Propagation-Resistant Hybrid Bearings for High-Performance Turbine Engines

Award Information
Agency:
Department of Defense
Branch:
Air Force
Amount:
$749,963.00
Award Year:
2009
Program:
SBIR
Phase:
Phase II
Contract:
FA8650-09-C-2914
Agency Tracking Number:
F073-053-0160
Solicitation Year:
2007
Solicitation Topic Code:
AF073-053
Solicitation Number:
2007.3
Small Business Information
UES, Inc.
4401 Dayton-Xenia Road, Dayton, OH, 45432
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
Y
Duns:
074689217
Principal Investigator
 Rabi Bhattacharya
 Div Dir/Prin Research Sci
 (937) 426-6900
 rbhattacharya@ues.com
Business Contact
 Bryce Skinn
Title: Business Relations Manage
Phone: (937) 426-6900
Email: bskinn@ues.com
Research Institution
N/A
Abstract
The objective of this SBIR project is to develop spall propagation resistant turbine engine mainshaft bearings for improved reliability, safety, and performance margin of aircraft propulsion systems. New case carburized Pyrowear 675 steel has been developed for bearing races that has been shown to resist surface fatigue initiation and therefore improve fatigue life significantly compared to the currently used M50 steel. However, once the initiation occurs, fatigue cracks can propagate rapidly resulting in increased spall rate in Pyrowear 675 races. This aspect of the fatigue properties of Pyrowear 675 has not been studied in great detail.  In this Phase II SBIR project, UES proposes to identify the key properties of Pyrowear 675 such as microstructure, compressive residual stresses and near-surface fracture toughness that control the spall propagation rate by analyzing new and failed bearings.  Also, computer modeling and simulation will be used to understand the role of dynamic operating conditions such as load and speed on the spall propagation. Based on the understanding of the mechanism developed in Phase II, UES will optimize the heat treatment protocol for P675 to achieve the optimum properties for improved bearing life. BENEFITS: Spall propagation-resistant hybrid bearings will improve reliability and safety of high performance aircraft in both military and commercial sectors.

* information listed above is at the time of submission.

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