Effect of Changing Ellipiticity Ratio on the Formation of Ultra-Thin Lubricating Film

Al-Samieh, M.F. Abd

doi:10.24874/ti.2017.39.04.02

Cited by 2 publications

(2 citation statements)

References 29 publications

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“…where δ -the total elastic deformation of the contiguous bodies in contact is given as shown by Gohar and Rahnejat [1], Al-Samieh and Rahnejat [23] and Al-Samieh [24,25]. The last term (S(X, Y )) in film thickness equation ( 2) is used to represent the geometry of the surface roughness.…”

Section: Background Theorymentioning

confidence: 99%

Archive of Mechanical Engineering

Al-Samieh

2020

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Ridge geometry effect on the behavior of elastohydrodynamic lubrication of point contact problemA numerical solution is presented to investigate the influence of the geometry and the amplitude of the transverse ridge on the characteristics of elastohydrodynamic lubrication for point contact problem under steady state condition. Several shapes of ridges with different amplitudes are used in the stationary case, such as flattop ridge, cosine wave ridge and sharp ridge of triangular shape. Results of film thickness and pressure distributions of the aforementioned ridge feature are presented at different locations through an elastohydrodynamically lubricated contact zone for different amplitude of the ridge. Simulations were performed using the Newton-Raphson iteration technique to solve the Reynolds equation. The numerical results reveal that, to predict optimum solution for lubricated contact problem with artificial surface roughness, the geometrical characteristics of the ridge should have profiles with smooth transitions such as those of a cosine wave shape with relatively low amplitude to reduce pressure spike and therefore cause the reduction in the film thickness. The position of the location of the ridge across the contact zone and the amplitude of the ridge play an important role in the formation of lubricant film thickness and therefore determine the pressure distribution through the contact zone.

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Section: Background Theorymentioning

confidence: 99%

Archive of Mechanical Engineering

Al-Samieh

2020

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“…Where δ is the total elastic deformation of the contiguous bodies in contact is given as shown by Al-Samieh and Rahnejat [22] and Al-Samieh [23].…”

Section: Background Theorymentioning

confidence: 99%

Surface Roughness Effects for Newtonian and Non-Newtonian Lubricants

Al-Samieh¹

2019

Tribol. Ind.

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In the present study, a numerical solution is presented to investigate the combined effects of lubricant rheology and surface roughness parameters on the characteristic of elastohydrodynamic lubrication problem for point contact. Sinusoidal waviness for surface roughness is considered to show the effect of changing amplitude and wavelength on the film thickness and pressure profile. The results show that, surface waviness leads to random fluctuations of pressure and film thickness for both modes of lubricant of Newtonian and non-Newtonian. As the amplitude of the waviness increase, the more fluctuations of pressure profile and film profile occur. Changing the wavelength of wavy surface shows that the amplitude of the pressure fluctuation becomes a little more remarkable as wavelength increase. The difference between Newtonian and non-Newtonian lubricant is that the non-parallel film shape in the contact region occurs for non-Newtonian model in addition to the reduction in film thickness compared to the Newtonian model.

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Effect of Changing Ellipiticity Ratio on the Formation of Ultra-Thin Lubricating Film

Abstract: A B S T R A C T

Cited by 2 publications

References 29 publications

Archive of Mechanical Engineering

Archive of Mechanical Engineering

Surface Roughness Effects for Newtonian and Non-Newtonian Lubricants

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