The optical interference intensity ROll technique, which enables measurements of filmthickness of magnitude below half of the wavelength of the incident light, is widely used in thestudy of thin film lubrication (TFL)...The optical interference intensity ROll technique, which enables measurements of filmthickness of magnitude below half of the wavelength of the incident light, is widely used in thestudy of thin film lubrication (TFL). However, the absorbing characteristics of the metallic compo-nents which are for generating suitable amount of reflectance to facilitate optimum inference im-ages has never been taken into consideration. This paper presents a theoretical analysis of theabsorbing characteristics. Results indicate that without acknowledging the absorbing effects, sig-nificant errors in film thickness measurements can be induced.展开更多
The general friction and wear performance of an iron particulate suspension underboundary lubrication conditions are presented. The suspension is a mixture of 1-5 micrometerdiameter carbonyl iron particles with commer...The general friction and wear performance of an iron particulate suspension underboundary lubrication conditions are presented. The suspension is a mixture of 1-5 micrometerdiameter carbonyl iron particles with commercial hydraulic oil, which resembles typical compositionof magneto-rheological fluids. The investigation involves changing the particle concentration of thesuspension. The optimal concentration of the suspension from a tribological view point can be ob-served from the experimental results,which provides a reference to the design of the particle load-ing of magneto-rheological fluids.展开更多
The paper presents an explicit matrix algorithm to solve the problem of an elastic wedge with three loaded surfaces.The algorithm makes use of a recently published concept of transformation matrix,by which the origina...The paper presents an explicit matrix algorithm to solve the problem of an elastic wedge with three loaded surfaces.The algorithm makes use of a recently published concept of transformation matrix,by which the original surface loads are converted to equivalent loads in half-space.The three loaded edges are considered simultaneously.The developed algorithm is used to study the effects of two free edges of a steel block and tapered rollers with different contact angles.The two load-free edges can substantially increase deformation if the two edges are close in distance.The results of the tapered roller simulation show that deformation is considerably sensitive to the contact angle of the tapered roller.The largest deformation appears at the big end of the roller.Furthermore,empirical formulae for correction factors for the calculation of block or quarter-space deformation based on half-space solutions are summarized.展开更多
文摘The optical interference intensity ROll technique, which enables measurements of filmthickness of magnitude below half of the wavelength of the incident light, is widely used in thestudy of thin film lubrication (TFL). However, the absorbing characteristics of the metallic compo-nents which are for generating suitable amount of reflectance to facilitate optimum inference im-ages has never been taken into consideration. This paper presents a theoretical analysis of theabsorbing characteristics. Results indicate that without acknowledging the absorbing effects, sig-nificant errors in film thickness measurements can be induced.
文摘The general friction and wear performance of an iron particulate suspension underboundary lubrication conditions are presented. The suspension is a mixture of 1-5 micrometerdiameter carbonyl iron particles with commercial hydraulic oil, which resembles typical compositionof magneto-rheological fluids. The investigation involves changing the particle concentration of thesuspension. The optimal concentration of the suspension from a tribological view point can be ob-served from the experimental results,which provides a reference to the design of the particle load-ing of magneto-rheological fluids.
基金the Research Grants Council of Hong Kong(Project No.CityU11213914).
文摘The paper presents an explicit matrix algorithm to solve the problem of an elastic wedge with three loaded surfaces.The algorithm makes use of a recently published concept of transformation matrix,by which the original surface loads are converted to equivalent loads in half-space.The three loaded edges are considered simultaneously.The developed algorithm is used to study the effects of two free edges of a steel block and tapered rollers with different contact angles.The two load-free edges can substantially increase deformation if the two edges are close in distance.The results of the tapered roller simulation show that deformation is considerably sensitive to the contact angle of the tapered roller.The largest deformation appears at the big end of the roller.Furthermore,empirical formulae for correction factors for the calculation of block or quarter-space deformation based on half-space solutions are summarized.
