AVS 58th Annual International Symposium and Exhibition
    Tribology Focus Topic Thursday Sessions
       Session TR+AS+SS-ThM

Paper TR+AS+SS-ThM9
Modeling the Pressure Dependence of Shear Strength in Sliding, Boundary-Layer Friction

Thursday, November 3, 2011, 10:40 am, Room 111

Session: Atomic-scale Characterization of Tribological Interfaces
Presenter: Michael Garvey, University of Wisconsin-Milwaukee
Authors: M. Garvey, University of Wisconsin-Milwaukee
M. Weinert, University of Wisconsin-Milwaukee
W.T. Tysoe, University of Wisconsin-Milwaukee
Correspondent: Click to Email
The pressure dependence of the shear strength of model alkali halide lubricant systems has been investigated at the density functional theory level. This is compared to the experimental dependence given by S = S0 + αP, where P is the contact pressure, S0 is the zero-pressure shear-strength and α is the coefficient of pressure dependence. Sliding potentials were calculated and shear is found to occur between the film and the sliding interface. The heights of the potentials were calculated as a function of compression, allowing the lateral force to be calculated as a function of pressure. The calculated values of S0 and α are in good agreement with experimental data.