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A Fracture Mechanics Approach to Wear Mechanism of Ceramics under Non-Conformal Rolling Friction
김종형,최시근,Seock-Sam Kim 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.6
Ceramics materials have some useful tribological properties. Therefore, they are used in a variety of industrial fields, which strongly require the severity of operating condition and higher reliability of tribosystem. In this paper, silicon nitride, silicon carbide, cermet, titania and alumina were tested under rolling friction to evaluate wear rate and clarify wear mechanism of ceramic materials based on fracture mechanics. From the experimental result, a wear model of ceramic materials was proposed and analyzed using linear elastic fracture mechanics. Finally, the new non-dimensional parameter, Sc, for the estimation of the ceramic wear rate was introduced and a wear equation was obtained.
혼합윤활조건에서 마이크로딤플의 크기에 따른 마찰특성평가
이승훈,최시근,김규만,채영훈(Younghun Chae),한무경,이영춘 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.11
The current study investigated the size effect of Micro-scale surface pattern to understand the potential benefits of friction reduction and durability in relative contact. Also, reduction of friction is therefore considered to be a necessary requirement for improved efficiency of machine. In this paper attempts to investigate the effect of density for micro-scale dimple pattern on bearing steel flat mated with pin-on-disk. We demonstrated the lubrication mechanism for a Stribeck curve, which has a relationship between the friction coefficient and a dimensionless parameter for lubrication condition. It is found that friction coefficient is depended on the density of surface pattern. It was thus verified that micro-scale dimple could affect the friction reduction considerably under mixed and hydrodynamic lubrication conditions from based on friction map. Lubrication condition regime has an influence on the friction coefficient induced the density of micro dimple.