Accession Number : ADA522034


Title :   Collaborative Research and Development (CR&D). Task Order 0049: Tribological Modeling


Descriptive Note : Final rept. 1 Jul 2006-1 May 2008


Corporate Author : UNIVERSAL TECHNOLOGY CORP DAYTON OH


Personal Author(s) : Kang, Young Sup


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a522034.pdf


Report Date : May 2008


Pagination or Media Count : 29


Abstract : This research in support of the Air Force Research Laboratory Materials and Manufacturing Directorate was conducted at Wright-Patterson AFB, Ohio from 1 July 2006 - 1 May 2008. This task worked to develop and validate models for tribological interfaces to provide guidance to the materials development R&D activities of AFRL/RXBT. Nanocomposite tribological coatings have been developed for the better performance and longer service life of machine components in extreme environments due to the improvement of the hardness, toughness, wear resistance, and friction reduction. Nanocomposite coatings consist of nanocrystalline phases encapsulated into an amorphous matrix for the optimum mechanical performance and load support. A finite element analysis (FEA) model was developed to investigate the behavior of nanocomposite coatings due to the nanoindentation. The concept of Voronoi tessellation has been used to model the geometrical features of random microstructure for the nanocomposite coatings. The FEA model was used for the study of stress distribution and deformation of nanocomposite coatings under the nanoindentation. Also, the FEA model was used for the design optimization of nanocomposite coating with different combination of crystalline phases and amorphous matrices for the various contact conditions.


Descriptors :   *TRIBOLOGY , *COATINGS , *MATHEMATICAL MODELS , NANOPARTICLES , OPTIMIZATION , FINITE ELEMENT ANALYSIS


Subject Categories : Coatings, Colorants and Finishes
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE