Article
Engineering, Mechanical
Matthew Horsfall, Matthew Simpson, Ramin Rahmani, Reza Nekouie-Esfahani
Summary: It is known that well-designed artificially enhanced surfaces can improve tribological performance. However, the effect of texture features not exposed to the contact area is not well understood. Three discs were tested in a ball on disc tribometer under representative contact conditions. Texture features directly beneath the contact increased friction, while those close to the contact reduced friction and wear.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Coatings & Films
Gang Shen, Jufan Zhang, Chengwei Kang, Fengzhou Fang
Summary: A new surface texturing design has been proposed to improve the tribological performance of bioimplants, with experimental results showing significant reductions in friction coefficient and wear rate compared to polished samples. The study confirmed that the hydrodynamic pressure in the textured bioimplants plays a negligible role, with the main working mechanisms being the ability to trap particles and provide a second lubrication effect.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Engineering, Mechanical
M. Venkata Krishna Reddy, Basil Kuriachen, Jino Joshy, M. L. Joy
Summary: This study investigates the influence of areal surface parameters according to ISO 25178 on the tribo-logical behavior of Ti6Al4V alloy. Lubricated sliding wear experiments were conducted at varied weights and sliding speeds using pin-on-disk tribo test with EN31 steel disk as the counter body and SAE40W15 as the lubricant according to ASTM G-99. The lowest friction coefficient was observed at a sliding velocity of 3 m/s, independent of normal load, while wear rate increased with increasing normal load. A number of areal surface parameters showed strong correlation with coefficient of friction (CoF) and wear depth. Among them, Spk had a correlation coefficient of -0.8247 with CoF, and Vvv had a correlation coefficient of -0.8415 with wear depth. Vvv and Svk retained the lubricant and extended the life of the component.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Coatings & Films
V. Kashyap, P. Ramkumar
Summary: Superior surface characteristics, including increased roughness and enhanced graphitic characteristics, can be achieved in DLC coated surface for hip implants through laser surface texturing and heat treatment. These techniques improve adhesion strength and deformation resistance by inducing phase formation and bonding behavior at the coating interlayer. The combination of surface texturing and DLC coating also results in lowest friction, making it beneficial for long term hip implant applications.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Xiang Yuan, Jun Wang, Zisheng Lian, Guofa Wang
Summary: An experimental and theoretical research on seal behavior was conducted in this work, using an innovative mixed lubrication model incorporating EHD theory. The computational procedure provided insight into the effects of seal pressure, rod velocity and compression ratio on sealing characteristics, accurately predicting friction force and providing a theoretical basis for EHL modeling.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Yurong Wang, Ping Yang, Bin Guo, Nan Jiang, Jingyin Chi, Jinjie Liu, Yijing Liang, Qiangliang Yu, Shuyan Yang, Feng Guo, Meirong Cai, Feng Zhou
Summary: Experimental results show that NP44 and NP88, as additives of PEG, can significantly improve tribological performance by forming stable protective films and enhancing lubrication properties. Additionally, they can increase film thickness in elastohydrodynamic lubrication to delay oil depletion on the lubrication track.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Chemical
Y. Zhao, P. L. Wong
Summary: Recent research has found a new lubrication scheme brought by boundary slip effect in lubrication. However, achieving a durable slip coating in elastohydrodynamic lubrication (EHL) is challenging. One possible solution is to apply a slip surface coating onto a substrate with an interlayer, creating a multi-layer structure. This study presents a robust framework for analyzing the effects of coating and interlayer thickness and strength, and develops a general algorithm for investigating the mechanics of boundary slip EHL contact.
Article
Engineering, Mechanical
Jiaxing Pei, Xu Han, Yourui Tao, Shizhe Feng
Summary: A method for analyzing the lubrication reliability of spur gear systems considering the randomness of external load and surface roughness is presented. The study captures the instantaneous failure probability of gear lubrication through a stochastic dynamics model and a reliability model of elastohydrodynamic lubrication (EHL), revealing higher lubrication failure probability in dedendum and single meshing region.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
M. Conradi, A. Kocijan, D. Klobcar, B. Podgornik
Summary: The study found that under different sliding conditions, dimples defined by nanosecond laser exhibited the lowest steady-state coefficient of friction, while in Hank's solution, lines and crosshatching showed better frictional characteristics after running-in and the removal of bulges around the laser textures. In terms of wear resistance, low-density lines pattern and particularly dimples were the most promising in contact situations likely to occur during starved/dry-lubrication conditions.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Biomedical
Audrey Ford, Zikai Hua, Stephen J. Ferguson, Lisa A. Pruitt, Leiming Gao
Summary: This study used a 3D-transient elastohydrodynamic model to investigate the interaction between material stiffness and film thickness in total hip arthroplasty material couples. The model showed that the average and central film thickness of PCU was higher than that of UHMWPE, but the distribution of film thickness was asymmetric and the minimum film thickness occurred outside of the central axis. While the overall film thickness of PCU was higher than UHMWPE, the minimum film thickness of PCU was lower for most of the gait cycle, indicating a more nuanced interaction between bearing material stiffness and film thickness.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2021)
Article
Engineering, Mechanical
Hongbo Zou, Bin Lin, Xinyu Ren, Hongyu Li, Quanwei Diao, Yang Wang, Tianyi Sui, Shuai Yan
Summary: In this study, the tribological behavior of surface texturing under water lubrication with particles of different sizes was analyzed through pin-on-disk tests. The results showed that regardless of the particle size, textured samples could effectively reduce the friction coefficient compared with untextured ones, up to 30% reduction. The efficiency of surface texturing in reducing friction decreased as the particle size increased, and the abrasive wear could be reduced when the particle size was smaller than the texture depth, while impact wear could occur when the particle size was larger than the texture depth.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Yawen Xue, Chaohua Wu, Xiaoliang Shi, Kaipeng Zhang, Qipeng Huang
Summary: The study found that textured surfaces with SnAg-Cu-Ti3C2 (TSs-SACT) exhibit excellent tribological properties at high temperatures and prolong the life of enamel layers.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Polymer Science
Junfeng Gu, Qin Li, Tianyi Zhang, Zheng Li, Shilun Ruan, Changyu Shen
Summary: The author proposes a non-spherical shape optimization design strategy for the femoral head to maximize the lubricating film thickness of the artificial hip joint (AHJ). The results demonstrate that the optimized non-spherical femoral head can significantly improve the minimum thickness and reduce the maximum pressure of the lubricating film compared to the standard spherical femoral head. This research provides guidance and theoretical support for novel design of AHJs.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Engineering, Mechanical
Pranav Dev Srivyas, M. F. Wani, Rakesh Sehgal, Chandra Shekhar Singh Bisht, M. S. Charoo, Ankush Raina, Mir Irfan Ul Haq
Summary: The study suggests that the combination of graphene as a solid lubricant and surface texturing can effectively reduce friction and wear in hybrid aluminum composite and chromium plated chrome steel tribopairs. Textured surfaces consistently showed lower coefficient of friction and wear volume compared to non-textured surfaces under both dry sliding and lubricated conditions.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Qiang Ma, Tao He, Arman Mohammad Khan, Q. Wang, Yip-Wah Chung
Summary: By experimenting with steel tribopairs, we found that glycerol aqueous solutions with a water/glycerol weight ratio of 0.2 can achieve reproducible superlow coefficient of friction within a short period of time, providing insights into macroscale liquid superlubricity.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Biomedical
Qingen Meng, Jing Wang, Peiran Yang, Zhongmin Jin, John Fisher
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2015)
Article
Materials Science, Multidisciplinary
Yan Chen, Yunping Li, Shingo Kurosu, Qingen Meng, Ning Tang, Yuichiro Koizumi, Akihiko Chiba
MATERIALS TRANSACTIONS
(2015)
Article
Engineering, Biomedical
Qingen Meng, Shuqiang An, Robin A. Damion, Zhongmin Jin, Ruth Wilcox, John Fisher, Alison Jones
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2017)
Article
Multidisciplinary Sciences
Qingen Meng, John Fisher, Ruth Wilcox
ROYAL SOCIETY OPEN SCIENCE
(2017)
Article
Biophysics
Qingen Meng, Leiming Gao, Feng Liu, Peiran Yang, John Fisher, Zhongmin Jin
JOURNAL OF BIOMECHANICS
(2010)
Article
Engineering, Biomedical
Q. E. Meng, F. Liu, J. Fisher, Z. M. Jin
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE
(2011)
Article
Engineering, Biomedical
Qingen Meng, Feng Liu, John Fisher, Zhongmin Jin
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE
(2013)
Article
Engineering, Biomedical
Qingen Meng, Zhongmin Jin, John Fisher, Ruth Wilcox
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE
(2013)
Article
Engineering, Biomedical
Qingen Meng, Zhongmin Jin, Ruth Wilcox, John Fisher
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE
(2014)
Article
Engineering, Mechanical
James Hesketh, Qingen Meng, Duncan Dowson, Anne Neville
TRIBOLOGY INTERNATIONAL
(2013)
Article
Engineering, Mechanical
Qingen Meng, Feng Liu, John Fisher, Zhongmin Jin
TRIBOLOGY INTERNATIONAL
(2013)
Article
Engineering, Mechanical
Xianjiu Lu, Qingen Meng, Jing Wang, Zhongmin Jin
TRIBOLOGY INTERNATIONAL
(2018)
Article
Engineering, Mechanical
Xianjiu Lu, David Necas, Qingen Meng, David Rebenda, Martin Vrbka, Martin Hartl, Zhongmin Jin
TRIBOLOGY INTERNATIONAL
(2020)
Article
Computer Science, Interdisciplinary Applications
Weijian Lin, Qingen Meng, Junyan Li, Zhenxian Chen, Zhongmin Jin
Summary: This study developed a highly inhomogeneous fibril-reinforced biphasic model considering both depth-dependent and strain-dependent properties to illustrate the effect of highly inhomogeneous properties on the mechanical behavior of articular cartilage. The number of layers in models with depth-dependent properties should be chosen based on research questions and clinical demands. Models with strain-dependent permeability demonstrated enhanced fluid pressurization capability.
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
(2021)
Article
Engineering, Mechanical
Leiming Gao, Xianjiu Lu, Xiaogang Zhang, Qingen Meng, Zhongmin Jin
Summary: This paper reviews the recent advancements in computational modelling of lubrication in hip and knee joint replacements, focusing on the contributions of Professor Duncan Dowson. It covers the development of key parameter modelling, mixed lubrication theory and approaches, as well as the challenges in simulating lubrication behavior and potential solutions for future studies.