Journal
TRIBOLOGY LETTERS
Volume 35, Issue 3, Pages 191-203Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11249-009-9448-0
Keywords
Contact mechanics; Surface roughness; Magnetic data storage; Thin solid film; Finite element analysis
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Funding
- National Science Foundation [CMS0239232]
- Information Storage Industry Consortium ( INSIC) EHDR Program
- U. S. Department of Energy [DEFG02-96-366 ER45439]
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An improved elastic contact model for a single asperity system is proposed accounting for both the effects of bulk substrate and asperity deformations. The asperity contact stiffness is based on the Hertzian solution for spherical contact, and the bulk substrate stiffness on the solution of Hertzian pressure on a circular region of the elastic half-space. Depending on the magnitude of the applied load, as well as the geometrical and physical properties of the asperity and bulk materials, the bulk substrate could have considerable contribution to the overall contact stiffness. The proposed single asperity model is generalized using two parameters based on physical and geometrical properties, and is also verified using finite element analysis. A parametric study for a practical range of geometric and physical parameters is performed using finite element analysis to determine the range of validity of the proposed model and also to compare it with the Hertz contact model. The single asperity model is extended to rough surfaces in contact and the contact stiffness from the proposed model and the simpler Greenwood-Williamson asperity model are compared to experimental measurements.
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