Tribometer For Measuring Coefficients Of Friction Of Uneven Surfaces Like Articular Cartilage
REVIEW OF SCIENTIFIC INSTRUMENTS(2020)
Abstract
To examine coefficients of friction (COFs) of articular cartilage, it is necessary to use cartilage as a friction partner. Irregularities of surfaces require special tribometers and calculation methods. The aim of this study was to establish a tribometer system for measuring a low COF of cartilage and to develop and validate an algorithm that takes the irregularities into consideration. We used a pin-on-plate tribometer that allows a vertical displacement of the pin to follow the surface of the plate and developed an algorithm that takes these irregularities into account. We were, thus, able to take into consideration a forward and backward movement, an upward and downward movement, and different force ratios. The algorithm was validated using a spherical POM (polyoxymethylene) pin against a stainless steel plate at slope angles up to 24 degrees. First examinations with articular cartilage against articular cartilage samples of a stifle joint of a pig were then performed. The newly developed tribometer worked well when POM against a stainless steel hump was examined. The COF increased for slope angles steeper than +/- 15 degrees. There was an interaction between the COF and the slope angle, but not for the range within +/- 15 degrees. Cartilage examinations revealed COFs as published in the literature. The tribometer and the algorithm were suitable for the detection of low COF of irregular surfaces of the plate within a range of +/- 15 degrees. The COF resulting from the forward and backward movements should be averaged. Published under license by AIP Publishing.
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Key words
articular cartilage,friction,uneven surfaces,measuring
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