TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Case Studies of Fatigue Life Improvement Using Low Plasticity Burnishing in Gas Turbine Engine Applications

[+] Author and Article Information
Paul S. Prevéy

Lambda Research, 5521 Fair Lane, Cincinnati, OH 45227pprevey@lambda-research.com

Ravi A. Ravindranath

NAVAIR, 22195 Elmer Road, Building 106, Room 202-G, Patuxent River, MD 10670-1534ravindranara@navair.navy.mil

Michael Shepard

Wright Patterson AFB, 2230 Tenth Street, Ste. 1, Wright Patterson AFB, OH 45433-7817michael.Shepard@wpafb.af.mil

Timothy Gabb

NASA Glenn Research Center, 21000 Brookpark Road, Building 49, Room 231, Cleveland, OH 44135-3191 timothy.gabb@lerc.nasa.gov

J. Eng. Gas Turbines Power 128(4), 865-872 (Sep 18, 2006) (8 pages) doi:10.1115/1.1807414 History: Received October 01, 2002; Revised March 01, 2003; Online September 18, 2006
Copyright © 2006 by ASME
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(a) 17-4 PH compressor blade being processed on the leading edge (LE) with an LPB caliper tool to improve FOD tolerance; (b) Ti-6-4 fan blade LPB processed along the lower LE. The hole near tip was made for HCF testing in cantilever bending (see Fig. 8).
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Residual stress and cold work depth profiles for IN718 before and after exposure to service temperature of 525 and 600°C for 100 h
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Thermal relaxation of shot peened (8 A, 400%) and LPB processed Ti-6Al-4V after 795°F (425°C) for 10 h
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High cycle fatigue performance of shot peened (8 A, 400%) and LPB processed thick section IN718 after 100 h, exposures at 525 and 600°C
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HCF tolerance of dull and sharp FOD after elevated temperature exposure simulating engine environments for shot peened (8 A, 400%) and low plasticity burnished (LPB) thick section IN 718
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HCF performance of thick section Ti-6-4 after SP and LPB surface treatments with and without the presence of a 250 μm (0.01 in.) FOD after exposure to service temperatures
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Photograph showing the cantilever-loading fixture for fatigue testing of the first stage fan blade. Note the LPB patch along the (upper) leading edge of the blade.
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Effect of LPB in mitigating HCF and FOD damage in Ti-6-4 fan blades
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Effect of LPB in mitigating HCF and FOD damage in a Ti-6-4 low pressure vane (LPV)
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HCF performance of thick-section 17-4 PH stainless steel with 0.25 mm (0.010 in.) FOD for base line, shot peened and LPB surfaces
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Corrosion fatigue performance of Custom 450 stainless steel with FOD in acidic salt solution and FOD from 0.25 mm (0.010 in.) to 0.76 mm (0.030 in.)
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Photograph of the fretting fixture showing the top two fretting rods clamped onto the top surface of the thick section HCF specimen
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Ti-6Al-4V fretting fatigue data for shot peened and LPB surface treatments




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