Influence of Dimple Depth on Lubricant Thickness in Elastohydrodynamic Lubrication for Metallic Hip Implants Using Fluid Structure Interaction (FSI) Approach

Mohd Syafiq Mohd Suri; Nor Liyana Safura Hashim; Ardiyansyah Syahrom; Mohd Juzaila Abd Latif; Muhamad Noor Harun

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Influence of Dimple Depth on Lubricant Thickness in Elastohydrodynamic Lubrication for Metallic Hip Implants Using Fluid Structure Interaction (FSI) Approach

Author: Mohd Syafiq Mohd Suri ¹ ; Nor Liyana Safura Hashim ² ; Ardiyansyah Syahrom ^{1
,

3} ; Mohd Juzaila Abd. Latif ⁴ ; Muhamad Noor Harun ^{1
,

5}
Author Information

1. School of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia&
2. School of Biomedical Engineering and Health Science, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia
3. Medical Device Technology, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
4. Faculty of Mechanical Engineering, Universiti Teknikal Melaka Malaysia, 75450 Ayer Keroh, Melaka, Malaysia
5. Sport Innovation and Technology Centre (SITC), Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
Publication Type:Journal Article
Keywords: Micro-dimpled Surfaces, Fluid-Structure Interaction (FSI), Elastohydrodynamic Lubrication (EHL), Metallic Hip Implants, Lubricant Thickness
From:Malaysian Journal of Medicine and Health Sciences 2020;16(Supp 8, Aug):28-34
CountryMalaysia
Language:English
Abstract: Introduction: The lubricant thickness in clearance between bearing surfaces for metallic hip implants are currently incapable of accommodating the motion experienced (high load and low entraining motion) in hip walking cycle. Thus, micro-dimpled surfaces were introduced onto surfaces of metallic acetabular cups to improve lubricant thickness. Micro-dimpled surface is a method of advanced surface improvement to increase the lubricant thickness in various tribological applications, such as hip implants. However, the application of micro-dimpled surfaces in hip implants has not yet been explored adequately. Therefore, this study aims to identify the influence of micro-dimpled depth on lubricant thickness elastohydrodynamically for metallic hip implants using Fluid-Structure Interaction (FSI) approach. Methods: Fluid-Structure Interaction (FSI) approach is an alternative method for analysing characteristics of lubrication in hip implant. Dimples of radius 0.25 mm and various depths of 5μm, 45μm and 100μm were applied on the cup surfaces. The vertical load in z-direction and rotation velocity around y-axes representing the average load and flexion-extension (FE) velocity of hip joint in normal walking were applied on Elastohydrodynamic lubrication (EHL) model. Results: The metallic hip implants with micro-dimpled surfaces provided enhanced lubricant thickness, namely by 6%, compared to non-dimpled surfaces. Furthermore, it was suggested that the shallow depth of micro-dimpled surfaces contributed to the enhancement of lubricant thickness. Conclusion: Micro-dimpled surfaces application was effective to improve tribological performances, especially in increasing lubricant thickness for metallic hip implants.
Full text:11.2020my0802.pdf