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TECHNICAL PAPERS

Effect of Coating Geometry on Contact Stresses in Two-Dimensional Discontinuous Coatings

[+] Author and Article Information
Sunil Ramachandra, Timothy C. Ovaert

University of Notre Dame, Aerospace and Mechanical Engineering Department, Notre Dame, IN 46556

J. Tribol 122(4), 665-671 (Apr 17, 2000) (7 pages) doi:10.1115/1.1310333 History: Received September 03, 1999; Revised April 17, 2000
Copyright © 2000 by ASME
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References

Messier,  R., Gehrke,  T., Frankel,  C., Venugopal,  V. C., Otaño,  W., and Lakhtakia,  A., 1997, “Engineered sculptured Nematic Thin Films,” J. Vac. Sci. Technol. A, 15, pp. 2148–2152.
Narasimhan, K., 1998, (Valenite, Inc.), private communication.
Hiraoka,  N., and Sasaki,  A., 1997, “Effect of discontinuous Hard Under-Coating on the Life of Solid Film Lubricant Under Extreme Contact Pressure,” Tribol. Int., 30, No. 6, pp. 429–434.
Ovaert, T. C., Ramachandra, S., and Pilione, L. J., 1995, “Discontinuous Thin-Films for Friction and Wear Applications,” Proceedings of the International Tribology Conference, Yokohama, Japan.
Ross,  C. A., and Barrese,  J. J., 1993, “Stress Mechanical Properties and Composition Measurements in Sputtered Thick Alumina Films,” Mater. Res. Soc. Symp. Proc., 308, pp. 595–600.
Polonsky,  I. A., and Keer,  L. M., 2000, “Fast Methods for Solving Rough Contact Problems: A Comparative Study,” ASME J. Tribol., 122, pp. 36–41.
Brandt,  A., and Lubrecht,  A. A., 1990, “Multilevel Matrix Multiplication and Fast Solution of Integral Equations,” J. Comput. Phys., 90, pp. 348–370.
Nogi,  T., and Kato,  T., 1997, “Influence of a Hard Surface Layer on the Limit of an Elastic Contact: Part I—Analysis Using a Real Surface Model,” ASME J. Tribol., 119, pp. 493–500.
Webster,  M. N., and Sayles,  R. S., 1986, “A Numerical Model for the Elastic Frictionless Contact of Real Rough Surfaces,” ASME J. Tribol., 108, pp. 314–320.
Gupta, P. K., Walowit, J. A., and Finkin, E. F., 1973, “Stress Distributions in Plane Strain Layered Elastic Solids Subjected to Arbitrary Boundary Loading,” ASME J. Lubr. Technol., pp. 427–433.
Gupta, P. K., and Walowit, J. A., 1974, “Contact Stresses Between an Elastic Cylinder and a Layered Elastic Solid,” ASME J. Lubr. Technol., pp. 250–257.
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Figures

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Discontinuous coating contact model
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Loading conditions and geometry of the physical model
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The rough layered contact model from Cole and Sayles 12
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Normal pressure from Hertz theory and the numerical analysis, identical layer and substrate properties
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Qualitative representations of normal pressure distributions for various coating geometries
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Surface normal pressure, 20 O/1 T coating: (a) numerical model results; (b) finite element results.
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Surface normal pressure, numerical model results. Friction coefficient=0.35. (a) 20 O/1 T, 60 O/3 T coatings; (b) 40 O/0.5 T, 40 O/2 T coatings. Discontinuous coating pressure distributions are symmetric about X=0.
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Surface normal pressure, numerical model results. Friction coefficient=0.35. Crown radius=51 mm. (a) 20 O/1 T, 60 O/3 T coatings. (b) 40 O/0.5 T, 40 O/2 T coatings. Discontinuous coating pressure distributions are symmetric about X=0.
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Surface normal pressure, numerical model results. Friction coefficient=0.35. Crown radius=25 mm. 20 O/1 T, 60 O/3 T coatings. Discontinuous coating pressure distributions are symmetric about X=0.
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Surface normal pressure, numerical model results. Friction coefficient=0.35. Crown radius=5 mm. 20 O/1 T, 60 O/3 T coatings. Discontinuous coating pressure distributions are symmetric about X=0.
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Coating interfacial σxx stress. Numerical model results. Friction coefficient=0.35. Crown radius=51 mm: (a) 20 O/1 T, 60 O/3 T coatings; (b) 40 O/0.5 T, 40 O/2 T.
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Coating interfacial σxx stress. Numerical model results. Friction coefficient=0.35. Crown radius=25 mm: (a) 20 O/1 T, 60 O/3 T coatings; (b) 40 O/0.5 T, 40 O/2 T.
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Coating interfacial σxx stress. Numerical model results. Friction coefficient=0.35. Crown radius=5 mm: (a) 20 O/1 T, 60 O/3 T coatings; (b) 40 O/0.5 T, 40 O/2 T.
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Coating interfacial σxx stress. Numerical model results. 40 O/0.5 T coating: (a) 51 mm crown radius; (b) 5 mm crown radius.

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