scholarly journals Effects of UHMWPE viscoelasticity on the squeeze‐film lubrication of hip replacements

2021 ◽  
Author(s):  
Xianjiu Lu ◽  
Qingen Meng ◽  
Zhongmin Jin
Keyword(s):  
Squeeze Film ◽  
Hip Replacements ◽  
Film Lubrication

Direct evidence of lubrication in ceramic-on-ceramic total hip replacements

2001 ◽  
Vol 215 (3) ◽  
pp. 265-268 ◽  
Author(s):  
S L Smith ◽  
D Dowson ◽  
A A J Goldsmith ◽  
R Valizadeh ◽  
J S Colligon
Keyword(s):  
Squeeze Film ◽  
Asperity Contact ◽  
Surface Separation ◽  
Total Hip Replacements ◽  
Hip Simulator ◽  
Hip Replacements ◽  
Acetabular Components ◽  
Thin Conducting Film ◽  
Film Lubrication ◽  
Ceramic On Ceramic

A study of surface contact and separation of ceramic-on-ceramic joints was undertaken in 25 per cent bovine serum using a hip simulator. An electrical resistivity technique was used to detect the extent of surface separation throughout a complete walking cycle. The femoral and acetabular components were coated in a thin conducting film of titanium nitride to allow application of the resistivity technique to non-conducting ceramic. Surface separation of the acetabular and femoral components was detected throughout each simulated walking cycle. Fluctuations in the applied voltage across the joint were observed which could not be attributed to elastohydrodynamic or squeeze-film lubrication effects. The probable cause of the voltage fluctuations was brief and occasional contact between the surfaces caused by a combination of asperity contact and subsequent detachment of the conductive coating.

Effect of concentration dependence of viscosity on squeeze film lubrication

2020 ◽  
Vol 75 (6) ◽  
pp. 533-542
Author(s):  
Poosan Muthu ◽  
Vanacharla Pujitha
Keyword(s):  
Carrying Capacity ◽  
Iterative Procedure ◽  
Squeeze Film ◽  
Load Carrying Capacity ◽  
Convection Diffusion ◽  
Load Carrying ◽  
Newtonian Viscous Fluid ◽  
Nicolson Scheme ◽  
Human Joint ◽  
Film Lubrication

AbstractThe influence of concentration of solute particles on squeeze film lubrication between two poroelastic surfaces has been analyzed using a mathematical model. Newtonian viscous fluid is considered as a lubricant whose viscosity varies linearly with concentration of suspended solute particles. Convection-diffusion model is proposed to study the concentration of solute particles and is solved using finite difference method of Crank–Nicolson scheme. An iterative procedure is used to get the solution for concentration, pressure and velocity components in film region. It has been observed that load carrying capacity decreases as the concentration of solute particles in the fluid film decreases. Further, the concentration of suspended solute particles decreases as the permeability of the poroelastic plate increases and these results may be useful in understanding the mechanism of human joint.

Combined effects of MHD and surface roughness on couple-stress squeeze film lubrication between porous circular stepped plates

2012 ◽  
Vol 56 ◽  
pp. 19-29 ◽  
Author(s):  
N.B. Naduvinamani ◽  
B.N. Hanumagowda ◽  
Syeda Tasneem Fathima
Keyword(s):  
Surface Roughness ◽  
Couple Stress ◽  
Squeeze Film ◽  
Combined Effects ◽  
Film Lubrication

Effect of surface roughness on couple stress squeeze film lubrication of long porous partial journal bearings

2006 ◽  
Vol 58 (4) ◽  
pp. 176-186 ◽  
Author(s):  
N.M. Bujurke ◽  
N.B. Naduvinamani ◽  
Syeda Tasneem Fathima ◽  
S.S. Benchalli
Keyword(s):  
Surface Roughness ◽  
Couple Stress ◽  
Journal Bearings ◽  
Squeeze Film ◽  
Film Lubrication ◽  
Effect Of Surface

Numerical investigation of squeeze film lubrication on bioinspired hexagonal patterned surface

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Binbin Su ◽  
Xianghe Zou ◽  
Lirong Huang
Keyword(s):  
Flow Rate ◽  
Carrying Capacity ◽  
Squeeze Film ◽  
Load Carrying Capacity ◽  
Two Dimensional ◽  
Working Mechanism ◽  
Content Type ◽  
Patterned Surface ◽  
Load Carrying ◽  
Film Lubrication

Purpose This paper aims to investigate the squeeze film lubrication properties of hexagonal patterned surface inspired by the epidermis structure of tree frog’s toe pad and numerically explore the working mechanism of hexagonal micropillar during the acquisition process of high adhesive and friction for wet contacts. Design/methodology/approach A two-dimensional elastohydrodynamic numerical model is employed for the squeezing contacts. The pressure distribution, load carrying capacity and liquid flow rate of the squeeze film are obtained through a simultaneous solution of the two-dimensional Reynolds equation and elasticity deformation equations. Findings Higher pressure is found to be longitudinally distributed across individual hexagonal pillar, with pressure peak emerging at the center of hexagonal pillar. Expanding the area density and shrinking the channel depth or initial film thickness will improve the magnitude of squeezing pressure. Relatively lower pressure is generated inside interconnected channels, which reduces the load carrying capacity of the squeeze film. Meanwhile, the introduction of microchannel is revealed to downscale the total mass flow rate of squeezing contacts. Originality/value This paper provides a good proof for the working mechanism of surface microstructures during the acquisition process of high adhesive and friction for wet contacts.

scholarly journals Effect of Pressure Dependent Viscosity on Couple Stress Squeeze Film Lubrication between Rough Parallel Plates

2015 ◽  
Vol 10 (1) ◽  
pp. 76-83 ◽  
Author(s):  
Neminath Bujappa Naduvinamani ◽  
Siddangouda Apparao ◽  
Hiremath Ayyappa Gundayya ◽  
Shivraj Nagshetty Biradar
Keyword(s):  
Couple Stress ◽  
Squeeze Film ◽  
Parallel Plates ◽  
Effect Of Pressure ◽  
Pressure Dependent Viscosity ◽  
Dependent Viscosity ◽  
Film Lubrication

Appropriate radial clearance of ceramic-on-ceramic total hip prostheses to realize squeeze-film lubrication

2004 ◽  
Vol 19 (4) ◽  
pp. 362-369 ◽  
Author(s):  
Kiyoshi Mabuchi ◽  
Rina Sakai ◽  
Michi Ota ◽  
Masanobu Ujihira
Keyword(s):  
Squeeze Film ◽  
Radial Clearance ◽  
Hip Prostheses ◽  
Total Hip ◽  
Total Hip Prostheses ◽  
Film Lubrication ◽  
Ceramic On Ceramic

Effect of surface roughness on magneto-hydrodynamic couple-stress squeeze film lubrication between circular stepped plates

2012 ◽  
Vol 24 (2) ◽  
pp. 61-74 ◽  
Author(s):  
N. B. Naduvinamani ◽  
B. N. Hanumagowda ◽  
A. Siddangouda
Keyword(s):  
Surface Roughness ◽  
Couple Stress ◽  
Squeeze Film ◽  
Film Lubrication ◽  
Effect Of Surface
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