IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Tribology Thursday Sessions
       Session TR-ThM

Paper TR-ThM3
Optimization of Wear-resistant Coating Architecture using Finite Element Analysis

Thursday, November 1, 2001, 9:00 am, Room 132

Session: Tribological Surface Engineering for Lubrication & Wear Resistance
Presenter: T.Z. Gorishnyy, University of Nebraska - Lincoln
Authors: T.Z. Gorishnyy, University of Nebraska - Lincoln
M.S. Aouadi, University of Nebraska - Lincoln
L. Olson, University of Nebraska - Lincoln
S.L. Rohde, University of Nebraska - Lincoln
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Chromium nitride based single layer, bilayer and multilayer coatings were deposited by unbalanced reactive magnetron sputtering on A2 steel and aluminium substrates. Their wear rates were measured using pin-on-disk testing under normal loads of 4 N and 10 N for Aluminum and A2 steel substrates respectively. Finite element analysis (FEA) was utilized to investigate stress distributions in film-substrate systems under conditions, which related to those of the actual wear tests. Two-dimensional asymmetrical models were created for every coating-substrate architecture tested. The FEA results were compared with analytical solutions for Hertzian contacts with and without frictional effects. A good fit was observed. Fracture mechanics in conjunction with FEA data was used to interpret differences in wear rates for different samples. The following possible causes of fracture were considered: (1) failure in individual layers; (2) delamination of multilayered films due to high in-plane interfacial stresses; (3) failure due to crack propagation at film-substrate interface and (4) failure as a result of film buckling.