Efficient Modeling of Fretting of Blade/Disk Contacts Including Load History Effects

[+] Author and Article Information
H. Murthy, G. Harish, T. N. Farris

School of Aeronautics & Astronautics, Purdue University, 315 North Grant Street, West Lafayette, Indiana 47907-2023e-mail: haradana@ecn.purdue.edu

J. Tribol 126(1), 56-64 (Jan 13, 2004) (9 pages) doi:10.1115/1.1540125 History: Received March 07, 2002; Revised July 07, 2002; Online January 13, 2004
Copyright © 2004 by ASME
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Pérez-Ruberté, E., 2001, “Elasto-Plastic Finite Element Analysis of Contacts With Applications to Fretting Fatigue,” Master’s thesis, Purdue University, W. Lafayette, IN.
Mindlin,  R. D., 1949, “Compliance of Elastic Bodies in Contact,” J. Appl. Mech., 16(3), 259–268.
Ciavarella,  M., Hills,  D. A., and Monno,  G., 1998, “The Influence of Rounded Edges on Indentation by a Flat Punch,” Proc. Inst. Mech. Eng., Part C: J. Mech. Eng. Sci., 212(4), pp. 319–328.
Jäger,  J., 1997, “Half-Planes Without Coupling Under Contact Loading,” Archive of Applied Mechanics, 67, pp. 247–259.
Murthy, H., Farris, T. N., and Slavik, D. C., 2001, “Fretting Fatigue of Ti-6Al-4V Subjected to Blade/Disk Contact Loading,” Developments in Fracture Mechanics for the New Century, 50th Anniversary of Japan Society of Materials Science, pp. 41–48.
Barber, J. R., 1992, Elasticity, Kluwer Academic Publishers, Dordrecht, The Netherlands.
Farris,  T. N., 1992, “Mechanics of Fretting Fatigue Tests of Contacting Dissimilar Elastic Bodies,” STLE Tribol. Trans., 35, pp. 346–352.
Murthy, H., Harish, G., and Farris, T., 2000, “Influence of Contact Profile on Fretting Crack Nucleation in a Titanium Alloy,” in Proc. of 41st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, 1 , pp. 1326–1333.
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Dovetail joint in aircraft engine hardware and the equivalent profile
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Flow chart for evaluation of pressure
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A schematic of the contact configuration used to validate the quasi-analytical solution approach. Note for such two-dimensional contacts, P and Q are line loads (loads per unit depth). σo is the bulk stress.
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Plot of nondimensionalized normal pressure, ap(x)/P, for a range of values of b/a
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Comparison of shear traction from SIE with that from FEM for a cylindrical pad of radius 178 mm in contact with a half-space: (a) Case 2: P=1.58 MN/m,Q=0.21 MN/m,σo=275 MPa; (b) Case 1: P=1.58 MN/m,Q=0.70 MN/m,σo=275 MPa.
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Comparison of results for the contact of a nominally flat surface (flat length, c=3 mm, and radius at the edges, R=3 mm, Yield strength of Ti-6Al-4V, σY=758 MPA) with a flat surface. (P=1.59 MN/m,Q=0.55 MN/m,σo=0 MPa): (a) Comparison of pressure and shear traction between SIE and FEM; (b) Comparison of surface tangential stress between SIE and FEM.
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Comparison of tangential stress between SIE and FEM for a cylindrical surface in contact with a flat surface, at the edge of contact. (Ti-6Al-4V, P=1.58 MN/m,Q=0.56 MN/m,σo=275 MPa,σY=758 MPa).
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Evaluation of subsurface stresses
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Example load history considered for analysis
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Mission points 1 through 12
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Mission points 13 through 18
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Comparison of the prescribed profile with the machined profile
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Effect of machining tolerances on the surface normal traction. The distance, x, is normalized with respect to the half contact length obtained from the analysis using prescribed profile. Normal force P=1576 kN/m.
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(a) Comparison of experimental lives with predicted nucleation lives using σeq as a critical parameter; and (b) Comparison of measured failure lives with predicted total lives taken as sum of nucleation lives and propagation lives for Ti-6Al-4V on Ti-6Al-4V contacts (estimated from fracture mechanics) 9.



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