Prediction of Creep Fatigue Interaction for Turbine Engine Components

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA8650-04-C-5216
Agency Tracking Number: F031-1568
Amount: $1,217,970.00
Phase: Phase II
Program: SBIR
Awards Year: 2004
Solicitation Year: 2003
Solicitation Topic Code: AF03-112
Solicitation Number: 2003.1
Small Business Information
750 Old Hickory Blvd, Building 2, Suite 270, Brentwood, TN, 37027
DUNS: 128193997
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Robert Tryon
 (615) 372-0299
Business Contact
 Loren Nasser
Phone: (615) 372-0299
Research Institution
Of particular consideration under VAATE I will be future requirements for long range strike aircraft. The sustained high mach usage requirements for the long range strike aircraft necessitate up to 10 times the requirement of F119. OEMs have indicated that in some cases the current fleet was flown hotter than expected and life was reduced on the order of 10 to 1. VEXTEC successfully demonstrated the potential for predicting creep-fatigue interaction based on bolt hole specimens. A significant difference was predicted for pure fatigue without creep, fatigue with global creep effects but no localized creep effects, and fatigue with both global and local creep consideration. The Phase I demonstration predicting valley dwell and peak dwell missions correlated with OEM experience. Phase I research consisted of damage nucleation and propagation (ie: transgranular verses intergranular effects), cyclic damage accumulation, cycle verses time dependence, and the availability of physics-based modeling approaches. Building on the Phase I work, the Phase II will develop a comprehensive methodology for predicting creep effects on fatigue life prediction for complex missions. This methodology will also consider environmental effects, such as embrittlement due to oxidation.

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

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