tailieunhanh - Plastic damage evolution in multilayer/coatings ductile substrate system under spherical inpentation: Influence of a metallic interlayer

The results' showed that the suitable metallic interlayer could improve resistance of ceramic coating systems through reducing the plastic damage zone size in the substrate under spherical indentation. | Vietnam Journal of Mechanics, VAST, Vol. 27, No. 2 (2005) , pp. 86 - 95 PLASTIC DAMAGE EVOLUTION IN MULTILAYER . COATINGS/DUCTILE SUBSTRATE SYSTEM UNDER SPHERICAL INPENTATION: INFLUENCE OF A METALLIC INTERLAYER LE MINH QuY, TRAN lCH TRINH Hanoi University of Technology Abstract. SpheriGal indentation problems of ceramic coatings/metallic inter-layer/ductile substrate were investigated numerically by axisymmetric finite element analysis (FEA) for two typical ceramic coatings with relatively high and low elastic modulus deposited on aluminum alloy and carbon steel. Various indenter radius-coating thickness ratios and interlayer thickness-coating thickness ratios were used in the modeling. Plastic damage zone evolution were discussed in connection with model parameters. The results' showed that the suitable metallic interlayer could improve resistance of ceramic coating systems through reducing the plastic damage zone size in the substrate under spherical indentation. Key words: Finite element, ceramic coatings, indentation, interlayer; I. INTRODUCTION Laminated structures composed of hard brittle ceramic outer layers and soft ductile substrates are commonly used in a variety of industrial fields for anti-wear application, corrosion protection, thermal insulation, and electrical isolation, etc [1,2] . Under contact conditions, the hard coatings ensure in general very high stresses. These situations lead to the damage or the failure of the coating/substrate systems. There are several different damage modes experimentally observed: plastic deformation in the substrate, surface ring crack, interface crack and delamination as schematically illustrated in Fig. la. The indentation problems of a sphere into elastic layers bonded to an elastic half-space have been investigated by integral transform method (see, ., [3-5]) and finite element methods (see, ., [6 , 7]) . Concerning elastic layers on elastic-plastic substrates, by means of finite element calculations, .

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• Vietnam Journal of Mechanics
• Plastic damage evolution
• Multilayer coatings ductile substrate system under spherical inpentation
• Influence of a metallic interlayer
• Ceramic coating systems
• The plastic damage zone size
• Dang Dinh Ang
• Nonlinear analysis and mechanics
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