Friction RandomPOD—A new method for friction measurement in noncyclic, multidirectional, dynamic pin-on-disk tests for orthopaedic bearing materials

Vesa Saikko*, Omar Morad, Raine Viitala

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

Abstrakti

The 16-station, computer-controlled RandomPOD wear test device was re-designed into a friction measurement device, Friction RandomPOD. The motion was implemented by a servo-electric x-y-stage and the load was proportional-pneumatic. The direction of sliding, velocity (v), acceleration, and the magnitude of the load (L) varied randomly and continuously. The nominal contact pressure p varied between 0 and 2.4 MPa and v between 0 and 40 mm/s. In the first version of the device, the frictional force components were continuously measured by two miniature load cells in two perpendicular directions. In the second version, the measurement was done with a three-axial, commercial load cell. The resultant frictional force was divided by the instantaneous load in order to obtain the coefficient of friction (μ) at a frequency of 200 Hz. Due to the light and accurate design of the device, vibrations were absent in the measured signals although the measurements were most dynamic. Hence no filtering was needed. Serum lubricated polyethylene/CoCr tests revealed non-symmetric distributions of μ, friction power Pμ, and μ vs. pv.

AlkuperäiskieliEnglanti
Artikkeli110273
Sivumäärä7
JulkaisuJournal of Biomechanics
Vuosikerta118
Varhainen verkossa julkaisun päivämäärä29 tammikuuta 2021
DOI - pysyväislinkit
TilaJulkaistu - 30 maaliskuuta 2021
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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