Modelling the Effects of Surface Residual Stresses on Fatigue Behavior of PM Disk Alloys

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNX11CD72P
Agency Tracking Number: 104633
Amount: $99,943.00
Phase: Phase I
Program: SBIR
Awards Year: 2011
Solicitation Year: 2010
Solicitation Topic Code: A1.01
Solicitation Number: N/A
Small Business Information
OH, Parma Heights, OH, 44130-3821
DUNS: 123834959
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: Y
Principal Investigator
 John Gayda, Jr.
 Principal Investigator
 (440) 845-7020
Business Contact
 Vinod Nagpal
Title: Business Official
Phone: (440) 845-7020
Research Institution
A finite element based model will be developed and validated to capture the evolution of residual stresses and cold work at machined features of compressor and turbine powder metallurgy superalloy disks. The focus will be to quantify, model and validate residual stress and cold work evolution at stress concentration features during simulated service in aerospace gas turbine engine disk materials. This will be accomplished by first utilizing existing NASA Test data. If the existing test data are insufficient, a minimum number of specimens will be tested if the resources permit. These specimens will have varied surface finish conditions to be determined in consultation with NASA personnel and will be tested using a thermal mechanical load history that will simulate the operating conditions of new generation of gas turbine engines and include the effect of superimposed dwell cycles. The deliverables will include effects of service history on residual stress and cold work depth profile evolutions within notches, and analytical modeling descriptions of the evolution of these parameters as a function of simulated service history. Also included will be models and algorithms extrapolating the predicted residual stresses and cold work to service conditions outside of those tested during the program.

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

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