Fretting Stresses in Single Crystal Superalloy Turbine Blade Attachments

[+] Author and Article Information
Nagaraj K. Arakere

Mechanical Engineering Department, University of Florida, Gainesville, FL 32611-6300e-mail: nagaraj@ufl.edu

Gregory Swanson

NASA George C. Marshall Space Flight Center, ED22/Strength Analysis Group, MSFC, AL 35812

J. Tribol 123(2), 413-423 (Jun 27, 2000) (11 pages) doi:10.1115/1.1308032 History: Received February 22, 2000; Revised June 27, 2000
Copyright © 2001 by ASME
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A subsurface fretting fatigue crack emanating from a carbide in a turbine blade attachment (PWA1422) and propagating along octahedral (111) shear planes 4
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Subsurface fretting fatigue crack initiation in a single crystal Ni turbine blade (platform tip) 18
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Strain range versus cycles to failure for LCF test data (PWA1493 at 1200°F)
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Shear stress amplitude [Δτmax] versus cycles to failure
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Secondary crystallographic orientation β versus crack depth for the SSME AHPFTP first stage turbine blade 823
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First stage turbine blade FE model and casting coordinate system
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Variation in primary crystallographic orientation is described by cases 0–32. The rotations Δ and Γ locate the primary axis relative to the casting axis. Table 4 gives values of Δ and Γ for the 33 cases.
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Convention for defining crystal orientation in turbine blades 8
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Material (x,y,z) and blade (x,y,z) coordinate systems
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Maximum shear stress amplitude (Δτmax,ksi) contour plot at the blade tip critical point
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Normalized HCF life (contour plot) at the blade tip critical point, as a function of primary and secondary orientation
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Representative stress plot for the single crystal blade attachment region
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HPFTP/AT first stage blade vonMises stress plot with local zoom in of the suction side upper contact region at the blade leading edge and the local coordinate system used for the contact results
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Fretting/galling induced crack in the contact region (suction side trailing edge of blade). Several arrest marks are visible. Crystal orientation: Δ=−6.7 Deg,γ=11.3 Deg,β=4.2 Deg.
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Fretting/galling induced cracking showing multiple origins and stage II cracks (pressure side trailing edge location). Crystal orientation: Δ=−2 Deg,γ=3 Deg,β=7 Deg.
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Contour plot of max shear stress amplitude, Δτmax at the critical contact location, as a function of primary (case number) and secondary (θ or β) crystallographic orientation
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Contour plot of the parameter σmax*(Δε/2) at the critical contact location, as a function of primary (case number) and secondary (θ or β) crystallographic orientation



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