Friction behavior of coupling motion for natural articular cartilage by reciprocating rotation |
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Authors: | ShanHua Qian ShiRong Ge |
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Institution: | (1) College of Mechano-electronic Engineering, China University of Mining & Technology, Xuzhou, 221116, China;(2) Institute of Tribology and Reliability Engineering, China University of Mining & Technology, Xuzhou, 221116, China;(3) Biotribology Center, State Key Laboratory of Tribology, Xuzhou, 221116, China |
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Abstract: | Based on the irregular surface of natural cartilage configurations, the tribological characteristics of coupling motion between
natural cartilage pairs were investigated by the variation of rotated offset and velocity. Contact displacement, contact load,
friction force and coefficient of friction from natural cartilage pairs were measured by a UMT-2 testing machine. In order
to obtain the steady part and wavy part, the contact load and contact displacement were decompounded by the five-point sliding
average method. These results showed that the contact load was composed of steady load and wavy load. And the contact displacement
was composed of cartilage deformation and surface outline. The steady load was similar to exterior load while natural cartilage
deformation increased nonlinearly with the sliding time. Wavy load had the correlative coefficient 0.235 with surface outline
due to the irregular surface of friction configurations. The coefficient of friction from cartilage friction configurations
was less influenced by smaller magnitude in rotated parameters. A few strange summits were obtained in the area of coefficient
of friction, and significantly related with local minimal values corresponding to the contact loads. The rotated offsets had
clear impact on contact load and a slight impact on contact displacement. Larger offset produced higher wavy magnitude of
the contact load. The rotated velocities played an evident role in cartilage deformation, but had a less influence on contact
load. Lower velocity brought larger cartilage deformation.
Contributed equally to this work
Supported by the National Natural Science Foundation of China (Grant No. 50535050) |
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Keywords: | articular cartilage contact displacement coefficient of friction coupling motion |
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