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Ultra fractal 6 license12/4/2023 With the extension of wear running-cycles, the proportion of strip wear debris reduces and the percentages of flaky and blocky wear debris increase obviously. The adhesive and ploughing wear are the main wear mechanisms, corresponding to the running-in stage of the wear movement. In the initial stage of wear, the strip and flaky wear debris with the larger fractal dimension occupy the largest proportion in total wear debris. The fractal characteristics of UHMWPE wear debris group directly reflects the transformation trend of wear mechanism. The fractal dimension D of ideal spherical shaped wear debris is close to zero. When the wear particles changes from the larger sized strip to the smaller sized near-sphere, the radar fractal dimension decreases continuously. Results: The fractal characteristics of the single UHMWPE wear debris are very obvious. The automatic extraction and fractal identification system of wear debris based on the improved radar graph method was used to investigate the fractal characteristics and size distribution of UHMWPE wear particles. Scanning electron microscope (Hitachi, S3000N) was used to observe the morphology characteristics of wear debris. The wear debris extraction was based on the standard of ISO17853. The knee joint simulator produced by University of Leeds (Simulation Solutions Ltd.) was used to realize the knee joint wear motion. Methods: The forged CoCrMo alloy (ISO5832-12) and ultra-high-molecular-weight polyethylene (UHMWPE, ISO5834-2) were selected as the artificial joint prosthesis materials. The aim of this study is to evaluate the fractal dimension and size distribution characteristics of UHMWPE wear particles in condition of artificial knee joint simulator by the automatic extraction and fractal identification system of wear debris based on the improved radar graph method. These fractal characteristics with a certain degree of regularity are favorable to study the wear mechanism under the different wear conditions. The wear debris with different morphology and size contains a large amount of information relating to the wear status, and has the typical fractal characteristics.
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