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http://dx.doi.org/10.9725/kts.2021.37.4.144

Evaluation of Brinell Hardness of Coated Surface by Finite Element Analysis: Part 2 - Influence of Substrate and Coating Thickness  

Park, TaeJo (School of Mechanical Engineering, ERI, Gyeongsang National University)
Kang, JeongGuk (Graduate School, School of Mechanical & Aerospace Engineering, Gyeongsang National University)
Publication Information
Tribology and Lubricants / v.37, no.4, 2021 , pp. 144-150 More about this Journal
Abstract
The most cost-effective method of reducing abrasive wear in mechanical parts is increasing their hardness with thin hard coatings. In practice, the composite hardness of the coated substrate is more important than that of the substrate or coating. After full unloading of the load applied to an indenter, its indentation hardness evaluated based on the dent created on the test piece was almost dependent on plastic deformation of the substrate. Following the first part of this study, which proposes a new Brinell hardness test method for a coated surface, the remainder of the study is focused on practical application of the method. Indentation analyses of a rigid sphere and elastic-perfect plastic materials were performed using finite element analysis software. The maximum principal stress and plastic strain distributions as well as the dent shapes according to the substrate yield stress and coating thickness were compared. The substrate yield stress had a significant effect on the dent size, which in turn determines the Brinell hardness. In particular, plastic deformation of the substrate produced dents regardless of the state of the coating layer. The hardness increase by coating behaved differently depending on the substrate yield stress, coating thickness, and indentation load. These results are expected to be useful when evaluating the composite hardness values of various coated friction surfaces.
Keywords
Brinell hardness; coating; indentation analysis; finite element analysis; yield stress;
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