Effects of Load, Squeeze Velocity, Viscosity on Pure Squeeze EHL Motion Using Optical Interferometry

Chu, Li‐Ming; Lin, Jaw Ren; Chang, Yuh Ping

doi:10.4028/www.scientific.net/kem.739.164

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…Figure 7 shows that the oil dimple thickness of the contact region obtained using FTMS is comparable to that obtained using the commercial software, Matrox Inspector (17) with experimental conditions of 82.602 N, 1 mm/s, and the HN lubricant. The interference fringe patterns of the contact region are also demonstrated.…”

Section: Resultssupporting

confidence: 52%

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Development of Oil Film Thickness Measurement Software Using Optical Interferometry

Chu¹,

Lee²,

Hsu³

et al. 2022

Sensors and Materials

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In this study, C# programming language on the Visual Studio platform and a novel algorithm were used to develop software for the calculation and analysis of the oil film thickness distribution. The execution of the software is divided into file reading, conversion to grayscale values, inputting coordinates or drawing a line manually, and data acquisition. This software also provides the grid auxiliary function, the storage of the original image, the storage of the grayscale versus pixel graph, and the storage of data functions. After grayscale data are obtained from the above steps, they will be drawn into a line chart. The changes in bright and dark fringes can be clearly distinguished from the grayscale image, and the film thickness is calculated using the interference equation. In this study, we used an optical elastohydrodynamic lubrication (EHL) impact tester and the self-developed film thickness measurement software (FTMS) to measure the dimple film thickness occurring when a ball impacts a flat plate covered with a thin layer of oil for different operation parameters. Excellent agreement between the value determined with FTMS and that determined with the commercial software has been reported after a series of comprehensive experiments.

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Section: Resultssupporting

confidence: 52%

“…The distribution of the oil film (paraffin-based oil) in an EHL point contact is explored by optical interferometry. Figures 1(a) and 1(b) show the device scheme (17) and a photo of the experimental hardware, respectively. The oil film exists between the gap of the sapphire glass disk and the steel ball.…”

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

Development of Oil Film Thickness Measurement Software Using Optical Interferometry

Chu¹,

Lee²,

Hsu³

et al. 2022

Sensors and Materials

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show abstract

“…Mezlane et al [18] studied the viscosity wedge deduced by the thermal effect and squeeze effect of an infinitely long cylinder in a transient non-Newtonian EHL problem by applying the Carreau-Yasuda rheological model. Recently, some experimental studies were conducted to investigate the rheological behaviours of non-Newtonian lubricants under the impact load [19,20]. Nevertheless, few theoretical studies have been carried out for the non-Newtonian lubrication problems in impact motion conditions.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Non-Newtonian Starved Thermal-elastohydrodynamic Lubrication of Heterogeneous Materials in Impact Motion

Bai

Dong

Zheng

et al. 2021

Acta Mech. Solida Sin.

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This study presents a numerical model for the thermal-elastohydrodynamic lubrication of heterogeneous materials in impact motion, in which a rigid ball bounces on a starved non-Newtonian oil-covered plane surface of an elastic semi-infinite heterogeneous solid with inhomogeneous inclusions. The impact–rebound process and the microscopic response of the subsurface inhomogeneous inclusions are investigated. The inclusions are homogenized according to Eshelby’s equivalent inclusion method. The Elrod algorithm is adopted to determine the lubrication starvation based on the solutions of pressure and film thickness, while the lubricant velocity and shear rate of the non-Newtonian lubricant are derived by using the separation flow method. The dynamic response of the cases subjected to constant impact mass, momentum, and energy is discussed to reveal the influence of the initial drop height on the impact–rebound process. The results imply that the inclusion disturbs the subsurface stress field and affects the dynamic response of the contact system when the surface pressure is high. The impact energy is the decisive factor for the stress peak, maximum hydrodynamic force, and restitution coefficient, while the dynamic response during the early approaching process is controlled by the drop height.

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Post-impact squeeze-out behavior of oils with different pressure-dependent rheological properties

Fang

Wen

Bai

et al. 2023

Tribology International

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Effects of Load, Squeeze Velocity, Viscosity on Pure Squeeze EHL Motion Using Optical Interferometry

Cited by 3 publications

References 9 publications

Development of Oil Film Thickness Measurement Software Using Optical Interferometry

Development of Oil Film Thickness Measurement Software Using Optical Interferometry

Modelling of Non-Newtonian Starved Thermal-elastohydrodynamic Lubrication of Heterogeneous Materials in Impact Motion

Post-impact squeeze-out behavior of oils with different pressure-dependent rheological properties

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