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Synthesized multi-station Tribo-test system for bio-tribological Evaluation in Vitro

Chinese Journal of Mechanical Engineering 2016年第4期29卷 853-861页

作者： WU Tonghai DU Ying LI Yang WANG Shuo ZHANG Zhinan Key Laboratory for Modern Design and Rotor-Bearing system of Ministry of Education Xi'an Jiaotong University State Key Laboratory of Mechanical Transmissions Chongqing University School of Mechanical Engineering Shanghai Jiao Tong University

tribological tests play an important role on the evaluation of long-term bio-tribological performances of prosthetic materials for commercial *** tests focus on the motion simulation of a real joint in vitro with only normal loads and constant velocities,which are far from the real friction behavior of human joints characterized with variable loads and multiple *** order to accurately obtain the bio-tribological performances of artificial joint materials,a tribological tester with a miniature four-station tribological system is proposed with four distinctive ***,comparability and repeatability of a test are ensured by four equal stations of the ***,cross-linked scratch between tribo-pairs of human joints can be simulated by using a gear-rack meshing mechanism to produce composite *** this mechanism,the friction tracks can be designed by varying reciprocating and rotating ***,variable loading system is realized by using a ball-screw mechanism driven by a stepper motor,by which loads under different gaits during walking are ***,dynamic friction force and normal load can be measured *** verifications of the performances of the developed tester show that the variable frictional tracks can produce different wear debris compared with one-directional tracks,and the accuracy of loading and friction force is within ？5%.Thus the high consistency among different stations can be ***,the proposed tester system could provide more comprehensive and accurate bio-tribological evaluations for prosthetic materials.

关键词： artificial joint multi-station tribological tester bio-tribology testing system

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