The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Xinping Yan - One of the best experts on this subject based on the ideXlab platform.
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The characterization of Wear transitions in sliding Wear Process contaminated with silica and iron powder
Tribology International, 2005Co-Authors: Chengqing Yuan, X.c. Zhou, Zhongxiao Peng, Xinping YanAbstract:When a machine is previous terminnext term operation, two moving surfaces interact to generate a large amount of previous termWearnext term particles. The previous termWearnext term debris generated inside the machine or contaminants from outside plays important roles previous terminnext term both two-body and three-body previous termWear.next term For all mining and port machinery, their lubricants are very likely to be polluted by contaminants such as previous termsilicanext term and other metallic debris such as previous termironnext term and nickel. previous termInnext term order to seek a deeper understanding of the effects of different contaminants on previous termWear Process,next term this project investigated previous termsliding Wear Processes when silica powder and iron powdernext term exist previous terminnext term lubricants.\ud \ud Four previous termsliding Wearnext term tests were conducted on a pin-on-disc tester with and without the contaminants. Visual inspection, ferrography analysis, particle quantity analysis using a particle analyzer, and numerical surface analysis using confocal laser scanning microscopy (CLSM) were conducted to study the previous termWearnext term particles and previous termWearnext term surfaces. Supported by the data generated from the comprehensive analyses on the previous termWearnext term particles and previous termWearnext term surfaces, the investigation of the effects of the added contaminants to the previous termWear Processes and Wearnext term mechanisms have been carried out and presented previous terminnext term this paper
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Effects of temperature on sliding Wear Process under contaminated lubricant test conditions
Wear, 2004Co-Authors: Chengqing Yuan, X.c. Zhou, Zhongxiao Peng, Xinping YanAbstract:Six sliding Wear tests have been conducted using a pin-on-disc tester to investigate the effects of temperature on sliding Wear Processes when the iron particle contaminants were existent or non-existent in the SAE40 lubricant. Ferrography analysis, particle size analysis using a CSI particle analyzer, numerical analysis on particle morphology based on confocal laser scanning microscope (CLSM) and surface examination of the tested samples using scanning electron microscope (SEM) were used to study the Wear particles and the Wear surfaces. Supported by data generated from the comprehensive analyses of the Wear particles and the surfaces of the tested samples, it is clear that the temperature of the SAE40 lubricating oil has a significant influence on the Wear Processes. The increase in the temperature of the SAE40 lubricant increases the probability of adhesion, oxidation and Wear rates. For the tests at elevated temperature, when the iron particles are added into the SAE40 lubricant, the degree of oxidation Wear increases compared with the test without the iron particles in the SAE40 lubricant. This study has shown that temperature plays an important role in Wear Process and it is crucial to control temperature for controlling Wear rates in sliding Wear Process
Pawel Pawlus - One of the best experts on this subject based on the ideXlab platform.
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Simulation of textured surface topography during a low Wear Process
Tribology International, 2011Co-Authors: Rafal Reizer, Lidia Galda, Andrzej Dzierwa, Pawel PawlusAbstract:Abstract Wear experiments were conducted on a block-on ring tester. The stationary block made from cast iron of 50 HRC hardness was ground. The rotated ground ring was made from 42CrMo4 steel of 32 HRC hardness. The rings were modified by a burnishing technique in order to obtain surfaces with oil pockets. Oil pockets of spherical and of drop shape were tested. The correlation and regression analysis of parameters of textured surface topography was carried out. Two sets of surfaces were analysed: after machining and after “zero-Wear”. As the result of analysis, minimum number of parameters describing this surface kind was obtained. A simple truncation model of the ring surface change was used. Worn surface topographies, after a low Wear, were also modeled in a different way. An idea of the proposed method of surface topography modeling is imposition of random surface of Gaussian ordinate distribution on the base surface (after burnishing). The modeled surfaces were correctly matched to the measured surfaces in 90% of all analysed cases. Basing on the simulation, the local Wear values during a low Wear Process were calculated and compared with experimental ones.
Lu Huang - One of the best experts on this subject based on the ideXlab platform.
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surface topography and friction coefficient evolution during sliding Wear in a mixed lubricated rolling sliding contact
Tribology International, 2019Co-Authors: Xin Pei, Ying Zhang, Lu HuangAbstract:Abstract Wear is a common phenomenon which most mechanical components suffer from. Available studies are mainly focused on the Wear performance after contact pairs operate for a period of time. The studies on evolution of surface topography and friction coefficient resulting from the Wear Process under mixed lubrication conditions are still limited. Further study of this issue may have a significant influence on Wear reduction and lubricating performance improvement. In the present study, surface topography and friction coefficient evolution during sliding Wear in a mixed lubricated rolling-sliding contact are investigated by the method based on the numerical approach developed by Zhu.et al. [1]. The numerical results are compared with experiment results to demonstrate the efficiency and accuracy of the present Wear model. The evolutions of Wear track, root mean square (RMS) roughness, and friction coefficient are observed systematically during Wear Process. The influences of load, slide-to-roll ratio and surface orientation on these characteristics are studied as well. The simulation results are in good agreement with experimental observations. The Wear track is quite different from the one under dry contact, due to the effect of oil and the contact deformation. The friction coefficient drops rapidly at first and then it keeps stable with small fluctuations with respect to Wear evolution. It indicates that load and slide-to-roll ratio have a remarkable impact on Wear rate, though the effect of surface topography is limited. Further, the results show that the RMS roughness deceases slightly at first and then it increases gradually during the Wear Process.
X.c. Zhou - One of the best experts on this subject based on the ideXlab platform.
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Surface roughness evolutions in sliding Wear Process
Wear, 2008Co-Authors: C.q. Yuan, Z. Peng, X.p. Yan, X.c. ZhouAbstract:Wear debris analysis is a technique for machine condition monitoring and fault diagnosis. One key issue that affects the application of Wear debris analysis for machine condition monitoring is whether the morphology of the Wear particles accurately depicts their original states and the\ud surface morphology of the components from which the particles separate. This study aimed to investigate the evolution of the surface morphology of Wear debris in relation to change in the surface morphology of Wear components in sliding Wear Process. Sliding Wear tests were conducted using a ball-on-disc tester under proper lubrication and improper lubrication conditions. The study of the particle size distribution and the surfaces of both the Wear debris and the tested samples in relation to the Wear condition and the Wear rates of the Wear components were carried out in this study. The evolutions of the surface topographies of both the Wear debris and the Wear components as Wear progressed were investigated. This study has provided insight to the progress of material degradation through the study of Wear debris. The results of this research have clearly demonstrated that: (a) there is a good correlation of the surface morphology of Wear debris and that of the Wear components, and (b) the surface\ud morphology of Wear debris contains valuable information for machine condition monitoring
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The characterization of Wear transitions in sliding Wear Process contaminated with silica and iron powder
Tribology International, 2005Co-Authors: Chengqing Yuan, X.c. Zhou, Zhongxiao Peng, Xinping YanAbstract:When a machine is previous terminnext term operation, two moving surfaces interact to generate a large amount of previous termWearnext term particles. The previous termWearnext term debris generated inside the machine or contaminants from outside plays important roles previous terminnext term both two-body and three-body previous termWear.next term For all mining and port machinery, their lubricants are very likely to be polluted by contaminants such as previous termsilicanext term and other metallic debris such as previous termironnext term and nickel. previous termInnext term order to seek a deeper understanding of the effects of different contaminants on previous termWear Process,next term this project investigated previous termsliding Wear Processes when silica powder and iron powdernext term exist previous terminnext term lubricants.\ud \ud Four previous termsliding Wearnext term tests were conducted on a pin-on-disc tester with and without the contaminants. Visual inspection, ferrography analysis, particle quantity analysis using a particle analyzer, and numerical surface analysis using confocal laser scanning microscopy (CLSM) were conducted to study the previous termWearnext term particles and previous termWearnext term surfaces. Supported by the data generated from the comprehensive analyses on the previous termWearnext term particles and previous termWearnext term surfaces, the investigation of the effects of the added contaminants to the previous termWear Processes and Wearnext term mechanisms have been carried out and presented previous terminnext term this paper
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Effects of temperature on sliding Wear Process under contaminated lubricant test conditions
Wear, 2004Co-Authors: Chengqing Yuan, X.c. Zhou, Zhongxiao Peng, Xinping YanAbstract:Six sliding Wear tests have been conducted using a pin-on-disc tester to investigate the effects of temperature on sliding Wear Processes when the iron particle contaminants were existent or non-existent in the SAE40 lubricant. Ferrography analysis, particle size analysis using a CSI particle analyzer, numerical analysis on particle morphology based on confocal laser scanning microscope (CLSM) and surface examination of the tested samples using scanning electron microscope (SEM) were used to study the Wear particles and the Wear surfaces. Supported by data generated from the comprehensive analyses of the Wear particles and the surfaces of the tested samples, it is clear that the temperature of the SAE40 lubricating oil has a significant influence on the Wear Processes. The increase in the temperature of the SAE40 lubricant increases the probability of adhesion, oxidation and Wear rates. For the tests at elevated temperature, when the iron particles are added into the SAE40 lubricant, the degree of oxidation Wear increases compared with the test without the iron particles in the SAE40 lubricant. This study has shown that temperature plays an important role in Wear Process and it is crucial to control temperature for controlling Wear rates in sliding Wear Process
Chengqing Yuan - One of the best experts on this subject based on the ideXlab platform.
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The characterization of Wear transitions in sliding Wear Process contaminated with silica and iron powder
Tribology International, 2005Co-Authors: Chengqing Yuan, X.c. Zhou, Zhongxiao Peng, Xinping YanAbstract:When a machine is previous terminnext term operation, two moving surfaces interact to generate a large amount of previous termWearnext term particles. The previous termWearnext term debris generated inside the machine or contaminants from outside plays important roles previous terminnext term both two-body and three-body previous termWear.next term For all mining and port machinery, their lubricants are very likely to be polluted by contaminants such as previous termsilicanext term and other metallic debris such as previous termironnext term and nickel. previous termInnext term order to seek a deeper understanding of the effects of different contaminants on previous termWear Process,next term this project investigated previous termsliding Wear Processes when silica powder and iron powdernext term exist previous terminnext term lubricants.\ud \ud Four previous termsliding Wearnext term tests were conducted on a pin-on-disc tester with and without the contaminants. Visual inspection, ferrography analysis, particle quantity analysis using a particle analyzer, and numerical surface analysis using confocal laser scanning microscopy (CLSM) were conducted to study the previous termWearnext term particles and previous termWearnext term surfaces. Supported by the data generated from the comprehensive analyses on the previous termWearnext term particles and previous termWearnext term surfaces, the investigation of the effects of the added contaminants to the previous termWear Processes and Wearnext term mechanisms have been carried out and presented previous terminnext term this paper
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Effects of temperature on sliding Wear Process under contaminated lubricant test conditions
Wear, 2004Co-Authors: Chengqing Yuan, X.c. Zhou, Zhongxiao Peng, Xinping YanAbstract:Six sliding Wear tests have been conducted using a pin-on-disc tester to investigate the effects of temperature on sliding Wear Processes when the iron particle contaminants were existent or non-existent in the SAE40 lubricant. Ferrography analysis, particle size analysis using a CSI particle analyzer, numerical analysis on particle morphology based on confocal laser scanning microscope (CLSM) and surface examination of the tested samples using scanning electron microscope (SEM) were used to study the Wear particles and the Wear surfaces. Supported by data generated from the comprehensive analyses of the Wear particles and the surfaces of the tested samples, it is clear that the temperature of the SAE40 lubricating oil has a significant influence on the Wear Processes. The increase in the temperature of the SAE40 lubricant increases the probability of adhesion, oxidation and Wear rates. For the tests at elevated temperature, when the iron particles are added into the SAE40 lubricant, the degree of oxidation Wear increases compared with the test without the iron particles in the SAE40 lubricant. This study has shown that temperature plays an important role in Wear Process and it is crucial to control temperature for controlling Wear rates in sliding Wear Process
