Effect of ellipse motion paths with different aspect ratios on friction and wear of highly crosslinked polyethylene

2021 ◽  
pp. 089270572110108
Author(s):  
Xinyue Zhang ◽  
Dekun Zhang ◽  
Kai Chen ◽  
Handong Xu
Keyword(s):  
Friction Coefficient ◽  
Friction And Wear ◽  
Damage Mechanism ◽  
Wear Testing ◽  
Motion Path ◽  
Short Axis ◽  
Cobalt Chromium ◽  
Aspect Ratios ◽  
Profile Depth ◽  
Motion Paths

Cobalt chromium molybdenum alloy and highly cross-linked polyethylene are selected as the counterpairs in this study to carry out friction and wear testing over different ellipse motion paths to explore the influence of ellipse motion path on friction and wear of prosthesis materials. Here, the analytical methods for the periodic friction coefficient and special point wear are proposed to investigate the relationship between motion paths and tribological properties. The damage mechanism model of high cross-linked polyethyleneunder ellipse motion paths was established, which revealed the connection among material composition, motion paths and friction and wear mechanism. The results show that the friction coefficient and wear morphology are directly affected by changes in motion paths. The friction coefficient decreases with increasing aspect ratios, and the wear profile depth increases with increasing aspect ratios. The spatially resolved friction coefficient curve distinctly exhibits periodic “W”-type variation in elliptical motion paths. The friction coefficient shows maximum values at the long-axis endpoints and minimum values at the short-axis endpoints. There are different wear morphologies in different characteristic areas over the elliptical wear paths. The wear profile depth and width at the long-axis endpoints are larger than those at the short-axis endpoints, and the wear morphology is also more serious.

Tribological characterization of all-polymer prosthesis based on multi-directional motion

2021 ◽  
pp. 089270572110286
Author(s):  
Xinyue Zhang ◽  
Dekun Zhang ◽  
Kai Chen ◽  
Handong Xu ◽  
Cunao Feng
Keyword(s):  
Friction Coefficient ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Quantitative Relationship ◽  
Motion Path ◽  
Aspect Ratios ◽  
Directional Motion ◽  
Motion Paths ◽  
Prosthesis Material

The complex movement of artificial joints is closely related to the wear mechanism of the prosthesis material, especially for the polymer prosthesis, which is sensitive to motion paths. In this paper, the “soft-soft” all-polymer of XLPE/PEEK are selected to study the influence of motion paths on the friction and wear performance. Based on the periodic characteristics of friction coefficient and wear morphology, this paper reveals the friction and wear mechanism of XLPE/peek under multi-directional motion path, and obtains the quantitative relationship between friction coefficient and the aspect ratios of “∞”-shape motion path, which is of great significance to reveal and analyze the wear mechanism of “soft” all-polymer under multi-directional motion path. The results show that the friction coefficient is affected by the motion paths and have periodicity. Morever, under the multi-directional motion paths, the wear of PEEK are mainly abrasive wear and adhesive wear due to the cross shear effect, while the wear of XLPE is mainly abrasive wear with plastic accumulation. In addition, the friction coefficient is greatly affected the aspect ratios Rs-l of “∞”-shape and loads. Meanwhile, the wear morphologies are greatly affected by the aspect ratios Rs-l of “∞”-shape, but less affected by loads.

Friction and Wear of Hemiarthroplasty Biomaterials in Reciprocating Sliding Contact With Articular Cartilage

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
S. M. T. Chan ◽  
C. P. Neu ◽  
K. Komvopoulos ◽  
A. H. Reddi ◽  
P. E. Di Cesare
Keyword(s):  
Articular Cartilage ◽  
Friction Coefficient ◽  
Friction And Wear ◽  
Cartilage Explants ◽  
Cobalt Chromium ◽  
Protein Loss ◽  
Experimental Conditions ◽  
Reciprocating Sliding ◽  
Bovine Articular Cartilage ◽  
Nanoscale Friction

Friction and wear of four common orthopaedic biomaterials, alumina (Al2O3), cobalt-chromium (CoCr), stainless steel (SS), and crosslinked ultra-high-molecular-weight polyethylene (UHMWPE), sliding against bovine articular cartilage explants were investigated by reciprocating sliding, nanoscale friction and roughness measurements, protein wear assays, and histology. Under the experimental conditions of the present study, CoCr yielded the largest increase in cartilage friction coefficient, largest amount of protein loss, and greatest change in nanoscale friction after sliding against cartilage. UHMWPE showed the lowest cartilage friction coefficient, least amount of protein loss, and insignificant changes in nanoscale friction after sliding. Although the results are specific to the testing protocol and surface roughness of the examined biomaterials, they indicate that CoCr tends to accelerate wear of cartilage, whereas the UHMWPE shows the best performance against cartilage. This study also shows that the surface characteristics of all biomaterials must be further improved to achieve the low friction coefficient of the cartilage/cartilage interface.

Study on Tribological Performance of Al2O3 Particle Reinforced the Al-Sn Bearing Alloy

2014 ◽  
Vol 633-634 ◽  
pp. 137-140 ◽  
Author(s):  
Bin Sui ◽  
Jian Min Zeng ◽  
Ping Chen ◽  
Li Hua Liang ◽  
Wu Kui Gan ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Grain Boundary ◽  
Friction And Wear ◽  
Testing Machine ◽  
Tribological Performance ◽  
Wear Testing ◽  
Improve Performance ◽  
Computer Controlled ◽  
Bearing Alloy

In order to improve performance of Al-Sn bearing alloys, a new Al2O3/Al-Sn composite was fabricated through in-situ reaction between Al and SiO2. A study has been conducted to investigate tribological performance of the composite on MMW-1 Computer controlled vertical universal friction and wear testing machine. The results show that Al2O3 and Si particles are mainly distributed in the grain boundary and particles are often coated by a thin Sn layer. Friction coefficient of Al2O3/Al-Sn composites is decreased with Sn additions up to 21wt. %.

scholarly journals Tribological Properties of V-Shaped Surface Texture under Oil Lubrication Condition

2019 ◽  
Vol 37 (2) ◽  
pp. 401-406
Author(s):  
Yuanbo Wu ◽  
Xuefeng Yang ◽  
Shouren Wang ◽  
Jian Cheng ◽  
Hui Zhang ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Tribological Properties ◽  
Turbulence Intensity ◽  
Friction And Wear ◽  
Testing Machine ◽  
Wear Testing ◽  
Oil Lubrication ◽  
Oil Film ◽  
Texture Model ◽  
The Stability

In order to study the tribological properties of V-shaped texture under oil lubrication conditions, the loading force and speed are selected as the influencing factors, each factor selected six levels. Experimental study on friction and wear of V-shaped texture with ring arrangement is finished by MMG-10 Multifunctional Friction and Wear Testing Machine, and the data of the experimental results are analyzed by using Matlab. The results show that there is a near linear relationship between the friction coefficient and the loading force and velocity. The relationship between the friction coefficient and the loading force and velocity can be expressed by a functional equation. The loading force has a greater influence on the friction coefficient than the speed. The SEM images of the post-test specimens show that the main weared zone of the V-shaped texture is the tip part. Create a single V-shaped texture model with Solidworks and use CFD to divide the mesh into the Fluent solution. According to the pressure distribution cloud diagram and the turbulence intensity cloud diagram, the stability of the oil film is improved due to the enhanced fluidity of the oil film and the small change in the oil pressure. The tip portion is also the region with a large turbulence intensity value. The improvement of the stability of the oil film is the key to reduce the friction coefficient of the V-shaped texture when the loading force increases.

Damage behavior of orthopedic titanium alloys with martensitic microstructure during sliding wear in physiological solution

2019 ◽  
Vol 28 (8) ◽  
pp. 1228-1247 ◽  
Author(s):  
Ivana Cvijović-Alagić ◽  
Zorica Cvijović ◽  
Marko Rakin
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Friction And Wear ◽  
Adhesive Wear ◽  
Damage Mechanism ◽  
Physiological Solution ◽  
Material Transfer ◽  
Damage Behavior ◽  
Martensitic Microstructure ◽  
Wear Damage

Wear damage behavior of new orthopedic Ti-13Nb-13Zr (mass %) alloy with martensitic microstructures developed by different thermo-mechanical treatments were examined during sliding in simulated physiological solution. The results obtained for this alloy processed by cold and hot rolling were compared with that of the standard Ti-6Al-4 V (mass %) alloy heat-treated to produce martensitic microstructure. The block-on-disk sliding friction and wear tests were conducted in Ringer’s solution. The friction coefficient, wear rate, and wear damage mechanisms were determined over a range of normal loads (20–60 N) and linear sliding speeds (0.26–1.0 m/s). The surface damage morphology revealed the presence of corrosive, abrasive, and adhesive wear in all investigated materials. The friction and wear properties were found to be dependent on the predominant wear damage mechanism and applied load/sliding speed combination. In the case of a Ti-13Nb-13Zr alloy, the adhesive wear contributes to the higher wear rate and better friction behavior. This cold-rolled alloy, having a martensitic microstructure with the lowest hardness, shows the lowest friction coefficient values due to high material transfer from the alloy surface. The lowest friction resistance is observed for the Ti-6Al-4 V alloy with the highest hardness since the dominant wear damage mechanism is abrasion resulting in the low wear rate and material transfer.

Abrasion Resistance of Alumina-Titanium Dioxid Coating at High Temperature

2013 ◽  
Vol 302 ◽  
pp. 115-118 ◽  
Author(s):  
Zhi Fang Cheng ◽  
Hong Sheng Ding ◽  
Hui Rong ◽  
Li Geng Zhao
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Abrasion Resistance ◽  
Friction And Wear ◽  
Testing Machine ◽  
Wear Testing ◽  
Wear Volume ◽  
Air Plasma ◽  
Nano Coating ◽  
Tio2 Coatings

Nano-structured and micron Al2O3-13%TiO2 coatings were deposited by air plasma spraying.Wear properties of the coatings under different temperature trough SRV friction and wear testing machine were studied, the results shows that the friction coefficient of nano and micron Al2O3-13%TiO2 coatings both have rising trend.with the temperature increases.The wear volume of micron coating is 1.8-2 times that of the nano coating..The nanometer Al2O3-13%TiO2 coating slide with ZrO2 is still compact and has no large crack after abrasion.

scholarly journals Friction and Wear Behaviors of Fe-19Cr-15Mn-0.66N Steel at High Temperature

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1285
Author(s):  
Shaolong Sheng ◽  
Huiling Zhou ◽  
Xiaojing Wang ◽  
Yanxin Qiao ◽  
Hongtao Yuan ◽  
...  
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Photoelectron Spectroscopy ◽  
Laser Scanning ◽  
Friction And Wear ◽  
Laser Scanning Confocal Microscopy ◽  
Wear Testing ◽  
Oxide Layers ◽  
X Ray ◽  
Scanning Confocal Microscopy

The friction and wear behaviors of Fe-19Cr-15Mn-0.66N steel were investigated under applied loads of 5 N and 15 N at the wear-testing temperatures of 300 °C and 500 °C using a ball-on-disc tribometer. The wear tracks were evaluated by scanning electron microscopy (SEM) and laser scanning confocal microscopy (LSCM) to reveal the variation in morphologies. Energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) were used to determine the components of oxide layers formed on wear surfaces. The results demonstrated that the oxide layers are favorable for obtaining a low friction coefficient under all conditions. The average friction coefficient decreased with increasing load at 300 °C, while it increased with the increase in applied load at 500 °C. At 300 °C, severe abrasive wear characterized by grooves resulted in a high friction coefficient with 5 N applied, whereas the formation of a denser oxide layer consisting of Cr2O3, FeCr2O4, Fe2O3, etc., and the increased hardness caused by work hardening led to a decrease in friction characterized by mild adhesive wear. At 500 °C, the transformation of Fe2O3 to the relatively softer Fe3O4 and the high production of lubricating Mn2O3 resulted in a minimum average friction coefficient (0.34) when 5 N was applied. However, the softening caused by high temperature weakened the hardening effect, and thus the friction coefficient increased with 15 N applied at 500 °C.

The Friction and Wear Properties of Cu-Te-Li Alloys with High-Strength and High-Conductivity

2014 ◽  
Vol 599-601 ◽  
pp. 153-159 ◽  
Author(s):  
Tao Zeng ◽  
Lin Jiao ◽  
Da Chuan Zhu ◽  
Chen Yang
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Friction And Wear ◽  
Adhesive Wear ◽  
Testing Machine ◽  
Aging Treatment ◽  
Wear Testing ◽  
Dry Sliding ◽  
Wear Properties ◽  
Friction And Wear Properties

The friction and wear properties of Cu-Te-Li alloys under dry sliding condition were studied by M-200 wear testing machine. The morphology and chemical composition of worn surfaces were analyzed by SEM and EDS, thus the effect of aging treatment on friction coefficient, wear rate and wear mechanism was discussed. The results showed that Te element could improve the wear resistance of copper alloys. With Te content increasing, the friction coefficient of Cu-Te-Li alloys declined slightly and tended to be stable as a whole, while the wear rate decreased obviously. During the process of dry sliding friction, adhesive wear was the dominant mechanism, with oxidative wear coexisting. But for the Cu-Te-Li alloys after aging treatment, abrasive wear appeared and adhesive wear was intensified, especially at higher friction velocity.

Tribological effects of laser surface texturing and residual stress

2018 ◽  
Vol 70 (1) ◽  
pp. 126-132 ◽  
Author(s):  
Shuwen Wang ◽  
Feiyan Yan ◽  
Ao Chen
Keyword(s):  
Residual Stress ◽  
Wear Resistance ◽  
Friction And Wear ◽  
Surface Texturing ◽  
Laser Surface ◽  
Friction Reduction ◽  
Laser Surface Texturing ◽  
Wear Testing ◽  
Content Type ◽  
Surface Textures

Purpose The purpose of this paper is to investigate the tribological effects of laser surface texturing (LST) and residual stress on functional surfaces. Design/methodology/approach Three different surface textures (circular dimple, elliptical dimple and groove) with two different textured area ratios (10 and 20 per cent) are designed and fabricated by a Picosecond Nd YAG Laser machine. The friction and wear performance of textured specimens is tested using a UMT-2 friction and wear testing machine in mixed lubrication. Findings Test results show that elliptical dimples exhibit the best performance in wear resistance, circular dimples in friction reduction and grooves in stabilization of friction. The surfaces with larger textured area density exhibit better performance in both friction reduction and wear resistance. The improved performance of LST is the coupled effect of surface texture and residual stress. Originality/value The findings of this study may provide guidance for optimal design of functional surface textures in reciprocating sliding contacts under mixed or hydrodynamic lubrication, which can be used in automotive and other industrial applications.

scholarly journals Comparison Between the Action of Nano-Oxides and Conventional EP Additives in Boundary Lubrication

Lubricants ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 54
Author(s):  
Valdicleide Silva Mello ◽  
Marinalva Ferreira Trajano ◽  
Ana Emilia Diniz Silva Guedes ◽  
Salete Martins Alves
Keyword(s):  
Friction Coefficient ◽  
Boundary Lubrication ◽  
Friction And Wear ◽  
Film Formation ◽  
Environmental Issues ◽  
Protective Film ◽  
Extreme Pressure ◽  
Extreme Pressure Additives ◽  
Environmental Requirements ◽  
Lubrication Conditions

Additives are essential in lubricant development, improving their performance by the formation of a protective film, thus reducing friction and wear. Some such additives are extreme pressure additives. However, due to environmental issues, their use has been questioned because their composition includes sulfur, chlorine, and phosphorus. Nanoparticles have been demonstrated to be a suitable substitute for those additives. This paper aims to make a comparison of the tribological performance of conventional EP additives and oxides nanoparticles (copper and zinc) under boundary lubrication conditions. The additives (nanoparticles, ZDDP, and sulfur) were added to mineral and synthetic oils. The lubricant tribological properties were analyzed in the tribometer HFRR (high frequency reciprocating rig), and during the test, the friction coefficient and percentual of film formation were measured. The wear was analyzed by scanning electron microscopy. The results showed that the conventional EP additives have a good performance owing to their anti-wear and small friction coefficient in both lubricant bases. The oxides nanoparticles, when used as additives, can reduce the friction more effectively than conventional additives, and displayed similar behavior to the extreme pressure additives. Thus, the oxide nanoparticles are more environmentally suitable, and they can replace EP additives adapting the lubricant to current environmental requirements.

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