Fretting Fatigue Modeling and Life Prediction

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-07-C-0013
Agency Tracking Number: N062-126-0594
Amount: $79,600.00
Phase: Phase I
Program: SBIR
Awards Year: 2006
Solicitation Year: 2006
Solicitation Topic Code: N06-126
Solicitation Number: 2006.2
Small Business Information
121 Eastern Heights Drive, Ithaca, NY, 14850
DUNS: 608112389
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Bruce J Carter
 Research Engineer
 (607) 257-4970
Business Contact
 Paul Wawrzynek
Title: Managing Engineer
Phone: (607) 257-4970
Research Institution
The US Navy is working towards providing more reliable estimates of fatigue life to reduce the risk of component failure during flight and to improve repair schedules while reducing costs. Fretting fatigue is seen as one of the controlling factors in the life of aircraft engine components where cyclic loading leads to contact and slip between mating parts. For instance, the disk/blade assemblies in turbine engines suffer fretting at the dovetail contacts. In the proposed analysis methodology, an analytical model of fretting fatigue crack nucleation based on the uncracked stresses in the contact region provides the component life up to the point of a measurable crack. A finite-element-based approach to model the discrete, arbitrary, 3D crack growth from the measurable, initial crack to the point of failure provides a stress intensity factor history and remaining life estimate. The marriage of the two approaches provides a cradle-to-grave analysis capability for modeling fretting fatigue. Fracture Analysis Consultants Inc. (FAC) along with Research Applications Inc. (RAI), in consultation with Pratt & Whitney, intend to develop and validate such a methodology starting from RAI’s analytical model of fretting fatigue crack nucleation and FAC’s finite-element-based fracture analysis software, Franc3D/NG.

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

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