The effect of transfer film and surface roughness on the wear of lubricated ultra-high molecular weight polyethylene

1993 ◽  
Vol 14 (4) ◽  
pp. 295-302 ◽  
Author(s):  
J.R. Cooper ◽  
D. Dowson ◽  
J. Fisher
Keyword(s):  
Molecular Weight ◽  
Surface Roughness ◽  
High Molecular Weight ◽  
Transfer Film ◽  
Ultra High Molecular Weight

The influence of concave dimples on the metallic counterface on the wear of ultra-high molecular weight polyethylene

2011 ◽  
Vol 226 (6) ◽  
pp. 455-462 ◽  
Author(s):  
Xincong Zhou ◽  
Alison L Galvin ◽  
Zhongmin Jin ◽  
Xinping Yan ◽  
J Fisher
Keyword(s):  
Molecular Weight ◽  
Surface Roughness ◽  
Stainless Steel ◽  
High Molecular Weight ◽  
Smooth Surface ◽  
High Nitrogen ◽  
Acetabular Cup ◽  
Reference Case ◽  
High Nitrogen Stainless Steel ◽  
Ultra High Molecular Weight

The aims of this study were to investigate how the dimples on a metallic counterface affect the wear rate of ultra-high molecular weight polyethylene (UHMWPE) in a multi-directional reciprocating pin-on-plate machine. The plates were high nitrogen stainless steel, representing the femoral head material. The pins used in this study were of ultra-high molecular weight polyethylene GUR 1120, which represents the material used in an acetabular cup. Three different cases were investigated: a smooth surface without dimples as a reference case, a surface with medium dimples with an average valley of 2.3 µm and a surface with large dimples with an average valley of 5.9 µm. It was found that all the dimples investigated did not improve the lubrication, but instead increased the surface roughness; consequently, the wear of UHWMPE was slightly increased.

Influence of polyphenyl ester and nanosized copper filler on the tribological properties of carbon fibre–reinforced ultra-high-molecular-weight polyethylene composites

2017 ◽  
Vol 31 (11) ◽  
pp. 1483-1496
Author(s):  
Ziyang Wang ◽  
Yunhai Ma ◽  
Li Guo ◽  
Jin Tong
Keyword(s):  
Molecular Weight ◽  
Wear Rate ◽  
Carbon Fibre ◽  
High Molecular Weight ◽  
Transfer Film ◽  
Compression Moulding ◽  
The Coefficient Of Friction ◽  
Particulate Filler ◽  
Worn Surface ◽  
Ultra High Molecular Weight

Ultra-high-molecular-weight polyethylene (UHMWPE) reinforced with carbon fibre (CF) and filled with polyphenyl ester (POB) and nanosized copper (Cu) fillers was prepared by compression moulding. The tribological behaviours and the synergism of the incorporation of fibre and particulates were studied. The proportions of the reinforcement material ranged from 5 wt% to 25 wt%, the filler material of POB varied from 5 wt% to 25 wt% and the nanosized filler was from 4 wt% to 12 wt%. In the sample with CF only, the lowest wear rate was observed for the UHMWPE + 15% CF composite. The particulate filler further reduced the composite wear rate, and the lowest wear rate was found for the hybrid with CF, POB and nanosize Cu particles, that is, for the UHMWPE + 15% CF + 15% POB + 12% Cu composite. The particulate filler was added, and the coefficient of friction slightly increased. The transfer film formed on the metal counterface was studied using optical microscopy, and the topography of the transfer film was investigated using atomic force microscopy. Results showed that the transfer films were thin, compact and uniform on the metal counterfaces of the UHMWPE + 15% CF + 15% POB + 12% Cu composite. Worn surface morphologies of composites were studied using scanning electron microscopy. Results showed that the worn surface of the UHMWPE + 15% CF + 15% POB + 12% Cu composite was smoother and had better wear resistance than that of other composites.

S0202-2-2 Influence of surface roughness on tribological characteristics of ultra-high molecular weight polyethylene

2009 ◽  
Vol 2009.5 (0) ◽  
pp. 47-48
Author(s):  
Yoshitaka NAKANISHI ◽  
Mutsumi TOUGE ◽  
Hidehiko HIGAKI ◽  
Ken SHIMOTO ◽  
Akihisa KUGOTA ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Surface Roughness ◽  
High Molecular Weight ◽  
Tribological Characteristics ◽  
Ultra High Molecular Weight

The Wear of High Molecular Weight Polyethylene—Part I: The Wear of Isotropic Polyethylene Against Dry Stainless Steel in Unidirectional Motion

1978 ◽  
Vol 100 (2) ◽  
pp. 208-218 ◽  
Author(s):  
J. R. Atkinson ◽  
K. J. Brown ◽  
D. Dowson
Keyword(s):  
Molecular Weight ◽  
Stainless Steel ◽  
Steady State ◽  
Wear Rate ◽  
High Molecular Weight ◽  
Transfer Film ◽  
Fatigue Wear ◽  
Ultra High Molecular Weight ◽  
Sliding Distance ◽  
Unidirectional Motion

The wear of surgical grade ultra-high molecular weight polyethylene against stainless steel has been studied for unidirectional motion. After a short wearing-in period, two distinct steady-state regions appear on the wear graphs. In the first section adhesion is the predominant wear mechanism and a transfer film of polymer builds up on the steel counterface. After a certain sliding distance, determined by the load, the adhesive mechanism is augmented by fatigue wear and the wear rate increases sharply and remains constant at the new value.

Effects of Counterface Roughness and Conformity on the Tribological Performance of Crosslinked and Non-crosslinked Medical-Grade Ultra-High Molecular Weight Polyethylene

2002 ◽  
Vol 724 ◽  
Author(s):  
A. D. Chawan ◽  
A. M. Chakravartula ◽  
J. Zhou ◽  
L. A. Pruitt ◽  
M. Ries ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Surface Roughness ◽  
High Molecular Weight ◽  
Wear Mechanisms ◽  
Wear Behavior ◽  
Control Sample ◽  
Total Joint Replacements ◽  
Pin On Disk ◽  
Ultra High Molecular Weight ◽  
Medical Grade

AbstractThe tribological behavior of crosslinked ultra-high molecular weight polyethylene (UHMWPE) was compared to that of non-crosslinked UHMWPE, used as control sample. A reciprocating pin-on-disk tribometer was used to determine the effects of countersurface roughness and conformity on wear mechanisms occurring during the initial stage of sliding. Pin samples of two different radii of curvature were slid against medical-grade Co-Cr alloy disks with surface roughness ranging from 0.005 to 0.04 μm in a lubricant of bovine serum. Normal loads were chosen to provide physiological contact stresses. The focus of this study was on the dependence of early wear mechanisms on surface roughness and conformity. Although a correlation between coefficient of friction data and dominant wear mechanisms was not observed, different wear mechanisms were found between control and crosslinked UHMWPE. The results of this study provide insight into the differences of the initial wear behavior of noncrosslinked and crosslinked UHMWPE used in total joint replacements.

The wear of ultra-high molecular weight polyethylene sliding on metallic and ceramic counterfaces representative of current femoral surfaces in joint replacement

1997 ◽  
Vol 211 (1) ◽  
pp. 17-24 ◽  
Author(s):  
J G Lancaster ◽  
D Dowson ◽  
G H Isaac ◽  
J Fisher
Keyword(s):  
Molecular Weight ◽  
Surface Roughness ◽  
Wear Rate ◽  
High Molecular Weight ◽  
Exponential Function ◽  
Joint Replacement ◽  
Zirconia Ceramic ◽  
Wear Factor ◽  
Ultra High Molecular Weight ◽  
Counterface Roughness

A number of studies have investigated the influence of surface roughness on the wear of ultra-high molecular weight polyethylene (UHMWPE) in total joint replacement. The results of these studies have shown that the wear factor is proportional to the counterface roughness raised to a power greater than one. In this laboratory study, the effect of surface finish of several biomaterials on the wear of UHMWPE was studied. The study was conducted using reciprocating pin-on-plate wear tests with bovine serum as a lubricant. The biomaterials investigated as the counterface material included stainless steel, cast cobalt chrome (CoCr), CoCr (ASTM F799), alumina ceramic and zirconia ceramic. The counterface topographies of the wear plates were produced using techniques representative of current manufacturing methods. The surface roughness of the wear plates was varied in the range Ra, = 0.005-0.04 μm; this was representative of femoral heads and femoral knee components currently used clinically. Metals and ceramics with a similar surface roughness produced a similar wear rate of UHMWPE. For the limited range of smooth counterfaces used in this study only a moderate correlation was found between the surface roughness and the wear factors. For a change in counterface roughness Ra of 0.005 to 0.04 μm, the wear factor increased from 7.4 ± 1.6 to 16.5 ± 2.4 × 10−9mm3/N m (mean ± standard error). This variation in counterface roughness had much less effect in wear than previously reported for rougher counterfaces. For an extended range of counterface roughness, a stronger correlation was found using an exponential function for the regression fit. The exponential function shows the benefits of decreased wear with decreased surface roughness. Although the wear rate decreased less rapidly with decreased counterface roughness for Ra values below 0.05 μa, there were significant advantages to be gained from improved femoral head roughness to below 0.01 μm Ra

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