AVS 50th International Symposium
    Advanced Surface Engineering Tuesday Sessions
       Session SE-TuP

Paper SE-TuP5
Rheological Modeling of Fracture Mechanics of Hard Coatings on Soft Substrates at Hertzian Indentation

Tuesday, November 4, 2003, 5:30 pm, Room Hall A-C

Session: Poster Session
Presenter: L.V. Kireitseu, Institute of Mechanics and Machine Reliability, Belarus
Authors: M.V. Kireitseu, Institute of Mechanics and Machine Reliability, Belarus
L.V. Kireitseu, Institute of Mechanics and Machine Reliability, Belarus
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The present work described rheological modeling of novel coating «chrome carbide nanoparticles – aluminum oxide – soft aluminum substrate» and «steel – viscous-elastic polymer – aluminum – aluminum oxide» at their Hertzian indentation. When the hard aluminum oxide-based coatings are brought into contact with a ceramic or a metal indenter, different stress-deformation modes can be developed between the materials. Strains and forces will depend upon the state of the surfaces, its roughness and the fundamental mechanical properties of the two solids that are both indenter and substrate. Mechanical behaviour between the coatings and another solid indenter are discussed from a theoretical consideration of the mechanical constants (elasticity, plasticity and viscosity) of the coatings and experimentally by relating loading forces and stresses to the interface resulting from the contact. Rheological models were proposed for the coatings and were confirmed by in-suit experiments using principal Hertzian theory. An experimental evidence showed good agreement between the models and mechanical behavior of the coatings. Load rating tests revealed ultimate stresses and stress-deformation modes for both the coatings and their particular layer. The models and its behavior under a few fundamental conditions of loading (triangle, pulse, sinusoidal etc.) are discussed. @FootnoteText@ none