Accession Number:

ADA277240

Title:

New Micro- and Macroscopic Models of Contact and Friction

Descriptive Note:

Final technical rept. 1 Nov 90-31 Oct 93,

Corporate Author:

COMPUTATIONAL MECHANICS CO INC AUSTIN TX

Report Date:

1993-11-29

Pagination or Media Count:

186.0

Abstract:

This is the final report for the three year research project dedicated to the development of new asperity-based models of frictional interfaces. The main concept is to combine statistical homogenization methods with a realistic nonlinear finite element analysis of surface micro-asperities, and thus produce new asperity-based models of contact and friction. Research in the project started with the development of a complete theory and software for the statistical homogenization of random surface parameters. The next stage focused on the development of a finite element code for modeling surface asperities. This code is based on a proprietary hp adaptive finite element kernel, which has been customized for the analysis of elastic and elasto- viscoplastic asperities with contact, molecular-range adhesion, and sliding resistance. To verify the new asperity-based interface models, special experiments were designed and performed for custom-shaped asperities and for rough engineering surfaces. The results of these experiments compare favorably with asperity-based theoretical and numerical predictions, and thus confirm the feasibility and practical value of the new models developed in this project. These models will be applicable in the analysis and control of a broad range of contact and friction phenomena, such as friction-induced squeaks and noises, tribology of bearings, electrical and thermal connectors, the mechanism of wear, and many others.

Subject Categories:

  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE