Effect of Contact Area on the Wear and Friction of UHMWPE in Circular Translation Pin-on-Disk Tests

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Effect of Contact Area on the Wear and Friction of UHMWPE in Circular Translation Pin-on-Disk Tests. / Saikko, Vesa.

julkaisussa: JOURNAL OF TRIBOLOGY: TRANSACTIONS OF THE ASME, Vuosikerta 139, Nro 6, 061606, 01.11.2017.

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

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@article{97e59d8e427c4bb994fe9c5c0f0710dc,
title = "Effect of Contact Area on the Wear and Friction of UHMWPE in Circular Translation Pin-on-Disk Tests",
abstract = "Circular translation pin-on-disk (CTPOD) tests were performed for ultrahigh molecular weight polyethylene (UHMWPE) with a view to reproducing wear mechanisms that prevail in total hip prostheses. The contact surface diameter varied from 3.0 mm to 30 mm, while the slide track diameter was fixed, 10 mm. The counterface was polished CoCr, and the lubricant was diluted alpha calf serum. Either the nominal contact pressure (1.1 MPa) or the load (126 N) was kept constant. With a constant contact pressure, the wear factor decreased steeply when the contact diameter exceeded the slide track diameter, apparently because the wear debris was not readily conveyed away from the contact. With constant load, both the wear factor and the coefficient of friction increased linearly with increasing contact area. This trend was in agreement with clinical observations that the wear rate of UHMWPE acetabular cups increased with increasing femoral head size. With nominal contact pressures approaching 10 MPa however, the bearing surface topography markedly differed from clinical observations. This was probably due to overheating of the contact and plastic deformation that resulted in the formation of protuberances not seen clinically. The present study emphasized the importance of test parameters in the pin-on-disk wear screening of prosthetic joint materials. It appeared that the contact surface diameter of the flat-on-flat test should be below the slide track diameter, and that the nominal contact pressure should be of the order of 1 MPa.",
keywords = "Biotribology, Circular translation pin-on-disk, Prosthetic joint, UHMWPE",
author = "Vesa Saikko",
year = "2017",
month = "11",
day = "1",
doi = "10.1115/1.4036448",
language = "English",
volume = "139",
journal = "JOURNAL OF TRIBOLOGY: TRANSACTIONS OF THE ASME",
issn = "0742-4787",
publisher = "American Society of Mechanical Engineers (ASME)",
number = "6",

}

RIS - Lataa

TY - JOUR

T1 - Effect of Contact Area on the Wear and Friction of UHMWPE in Circular Translation Pin-on-Disk Tests

AU - Saikko, Vesa

PY - 2017/11/1

Y1 - 2017/11/1

N2 - Circular translation pin-on-disk (CTPOD) tests were performed for ultrahigh molecular weight polyethylene (UHMWPE) with a view to reproducing wear mechanisms that prevail in total hip prostheses. The contact surface diameter varied from 3.0 mm to 30 mm, while the slide track diameter was fixed, 10 mm. The counterface was polished CoCr, and the lubricant was diluted alpha calf serum. Either the nominal contact pressure (1.1 MPa) or the load (126 N) was kept constant. With a constant contact pressure, the wear factor decreased steeply when the contact diameter exceeded the slide track diameter, apparently because the wear debris was not readily conveyed away from the contact. With constant load, both the wear factor and the coefficient of friction increased linearly with increasing contact area. This trend was in agreement with clinical observations that the wear rate of UHMWPE acetabular cups increased with increasing femoral head size. With nominal contact pressures approaching 10 MPa however, the bearing surface topography markedly differed from clinical observations. This was probably due to overheating of the contact and plastic deformation that resulted in the formation of protuberances not seen clinically. The present study emphasized the importance of test parameters in the pin-on-disk wear screening of prosthetic joint materials. It appeared that the contact surface diameter of the flat-on-flat test should be below the slide track diameter, and that the nominal contact pressure should be of the order of 1 MPa.

AB - Circular translation pin-on-disk (CTPOD) tests were performed for ultrahigh molecular weight polyethylene (UHMWPE) with a view to reproducing wear mechanisms that prevail in total hip prostheses. The contact surface diameter varied from 3.0 mm to 30 mm, while the slide track diameter was fixed, 10 mm. The counterface was polished CoCr, and the lubricant was diluted alpha calf serum. Either the nominal contact pressure (1.1 MPa) or the load (126 N) was kept constant. With a constant contact pressure, the wear factor decreased steeply when the contact diameter exceeded the slide track diameter, apparently because the wear debris was not readily conveyed away from the contact. With constant load, both the wear factor and the coefficient of friction increased linearly with increasing contact area. This trend was in agreement with clinical observations that the wear rate of UHMWPE acetabular cups increased with increasing femoral head size. With nominal contact pressures approaching 10 MPa however, the bearing surface topography markedly differed from clinical observations. This was probably due to overheating of the contact and plastic deformation that resulted in the formation of protuberances not seen clinically. The present study emphasized the importance of test parameters in the pin-on-disk wear screening of prosthetic joint materials. It appeared that the contact surface diameter of the flat-on-flat test should be below the slide track diameter, and that the nominal contact pressure should be of the order of 1 MPa.

KW - Biotribology

KW - Circular translation pin-on-disk

KW - Prosthetic joint

KW - UHMWPE

UR - http://www.scopus.com/inward/record.url?scp=85024495959&partnerID=8YFLogxK

U2 - 10.1115/1.4036448

DO - 10.1115/1.4036448

M3 - Article

VL - 139

JO - JOURNAL OF TRIBOLOGY: TRANSACTIONS OF THE ASME

JF - JOURNAL OF TRIBOLOGY: TRANSACTIONS OF THE ASME

SN - 0742-4787

IS - 6

M1 - 061606

ER -

ID: 14909523