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TECHNICAL PAPERS: Gas Turbines: Manufacturing, Materials, and Metallurgy

Effect of Crystal Orientation on Fatigue Failure of Single Crystal Nickel Base Turbine Blade Superalloys

[+] Author and Article Information
N. K. Arakere

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

G. Swanson

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

J. Eng. Gas Turbines Power 124(1), 161-176 (Feb 01, 2000) (16 pages) doi:10.1115/1.1413767 History: Received November 01, 1999; Revised February 01, 2000
Copyright © 2002 by ASME
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References

Figures

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Convention for defining crystal orientation in turbine blades (2)
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Primary (close-packed) and secondary (non-close-packed) slip directions on the octahedral planes for a FCC crystal (4)
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Cube slip planes and slip directions for a FCC crystal (4)
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Material (x,y,z) and specimen (x,y,z) coordinate systems
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Strain range versus cycles to failure for LCF test data (PWA 1493 at 1200°F)
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maxn] (Eq. (1)) versus N
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[Δγ/2+Δεn/2+σno/E] (Eq. (2)) versus N
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[Δγ/2(1+k(σnmaxy))] (Eq. (3)) versus N
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[Δε1/2(σmax)] (Eq. (4)) versus N
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Shear stress amplitude [Δτmax] versus N
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[Δτmax (Δγmax/2)] versus N
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max (Δγmax/2)] versus N
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Secondary crystallographic orientation, β, versus crack depth for the SSME AHPFTP first stage turbine blade (2)
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Three-dimensional ANSYS model of HPFTP/AT rotating turbine components
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First-stage bla1de finite element model and casting coordinate system
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33 primary axis cases (Γ and Δ variations shown in Table 5) with nine secondary axis cases (β or θ values) each, for a total of 297 material orientations
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Representative von Mises stress distribution results in the blade attachment region
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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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