Accession Number : ADA259925


Title :   New Micro- and Macroscopic Models of Contact and Friction


Descriptive Note : Annual technical rept. no. 2, 1 Nov 1991-31 Oct 1992


Corporate Author : COMPUTATIONAL MECHANICS CO INC AUSTIN TX


Personal Author(s) : Tworzydlo, W W ; Cecot, W ; Oden, J T ; Yew, C H


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a259925.pdf


Report Date : Nov 1992


Pagination or Media Count : 105


Abstract : This report summarizes work in the second year of a project devoted 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 asperities, and thus produce new asperity-based models of contact and friction. The research in the first year of the project provided a complete theory and software for statistical homogenization of random surface parameters. In the second year of the project, the effort focused on the development of a finite element code for modeling of nonelastic surface asperities, as well as on the design and performance of the verification experiment. The asperity modeling code is based on an hp adaptive finite element kernel, with object-based data structure, error estimation and graphic user interface. The code is capable of modeling elastic and elasto-viscoplastic solids in contact with a rigid flat. In parallel with the code development, an experiment was designed and performed for custom-made asperities in contact with rigid surfaces. The results of these experiments compare favorably with numerical predictions of the finite element method. Finally, the results of the finite element analysis were used to construct the first asperity-based contact model of random surface. This work will continue in the next year.


Descriptors :   *SOFTWARE ENGINEERING , *FINITE ELEMENT ANALYSIS , *SURFACE ROUGHNESS , *FRICTION , VISCOPLASTICITY , VERIFICATION , MODELS , DEFORMATION , SURFACES , PLATES , ELASTOPLASTICITY , LUBRICATION , CONTAMINANTS , GRAPHICS , COMPUTER GRAPHICS , ERRORS , TRACTION , MATHEMATICAL PREDICTION , SOLIDS , ADHESION , PARAMETERS , INTERFACES , PREDICTIONS , STRESS STRAIN RELATIONS


Subject Categories : Numerical Mathematics
      Computer Programming and Software
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE