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Description to wear debris boundaries by radar graph fractal method

Chinese Science Bulletin 2007年第16期52卷 2285-2290页

作者： liu hongtao1,2 & ge shirong1 1.institute of tribology and reliability engineering,china University of mining & technology,xuzhou 221008,china 2 College of Mechanical and Electrical engineering,china University of mining & technology,xuzhou 2.1.1.,china institute of {1. and reliability engineering China University of Mining and Technology Xuzhou 221008 China

In this paper,radar graph fractal method is introduced to describe wear debris boundaries. Research results show that it is a nice way to describe wear debris boundaries. Since the longest axis is selected as the first coordinate axis,its center point selected as the center point of the radar graph,and the co-ordinate value of wear debris boundary selected as the measure parameter,the limitations existing in Yard fractal measure method can be avoided. For any wear debris,its radar graph fractal dimension value is one and only,and as the wear debris shape changes from round to strip,the radar graph fractal dimension value also changes from low to high,showing strong uniqueness and independence. Due to the fact that the researched wear debris is gotten in different wear states,the results also prove that radar graph fractal dimension value is correlated with frictional pairs work condition and wear state. Radar graph fractal method is compared with Yard fractal measure methods,and results show that ra-dar graph fractal dimension values gotten from different wear debris have enough value grads to avoid effect of errors,and provide higher sensitivity for wear debris shape. This paper also discusses the influencing factors for radar graph fractal method. With the increase of the decomposing degree value,the radar graph fractal dimension tends to keep stable at one certain value,showing the typical characteristic of the fractal theory. All this proves that radar graph fractal method is an effective description method for wear debris boundaries.

关键词：磨粒边界雷达图表分形法

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Relations between thickness of UHMWPE’s wear debris and positive pressure of tribological system

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Chinese Science Bulletin 2008年第9期53卷 1435-1443页

作者： liu hongtao1.2.3 & ge shirong1.3 1.institute of tribology and reliability engineering, china University of mining & technology, xuzhou 2.1.1., china 2 College of Mechanical and Electrical engineering, china University of mining & technology, xuzhou 2.1.1., china 3 Biotribology Center, State Key Laboratory of tribology, xuzhou 2.1.1., china institute of {1. and reliability engineering China University of Mining & Technology Xuzhou 221116 China College of Mechanical and Electrical {1. China University of Mining & Technology Xuzhou 221116 China Biotribology Center State Key Laboratory of Tribology Xuzhou 221116 China

MiaoXAM2.5X-50X Ultrahigh Precision Surface 3D Profiler is introduced to research the relations be- tween thickness of UHMWPE’s wear debris and positive pressure of tribological system. Research re- sults show that thickness of wear debris owns evident classification, and the first grade thickness math model and the second grade thickness math model are built. By the second grade thickness math model, the true force condition in the tribological system can be gotten, and the model can be used as a tool to modify simulating parameters of the tribological system, and it is an important inspecting method to the airtight system which cannot be examined in real time. The first grade thickness math model can describe the true working load and surface condition of work piece in the tribological sys- tem, and is an effective description method for the running condition of frictional pairs. The research results at different lubricating conditions testify the relations between thicknesses of wear debris and positive pressure of the tribological system. The fractal relation between maximal thickness of wear debris and positive pressure is discussed. The conceptions of the immutability principle and charac- teristic granularity of wear debris thickness are brought forward and discussed. In conclusion, as a stable tribological parameter owning mechanical theory basis, wear debris thickness will play an im- portant part in fault diagnosis, especially for the airtight system such as artificial joint.

关键词：摩擦学磨损面厚度分形数学模型

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Effect of Carburization on the Mechanical Properties of Biomedical Grade Titanium Alloys

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Journal of Bionic engineering 2011年第1期8卷 86-89页

作者： Yong Luo Haibo Jiang Gang Cheng hongtao {1. institute of {1. and reliability engineering School of Material Science and Engineering China University of Mining and Technology Xuzhou 221116 P. R. China Mechanical and Electrical engineering {1. Xuzhou Normal University Xuzhou 221116 P. R. China

Titanium cermets were successfully synthesized on the surface of biomedical grade titanium alloys by using sequential carburization method. The mechanical properties such as hardness, fracture toughness and plasticity were measured to estimate the potential application of titanium cermets. The results show that after carburization the surface hardness of titanium cermets was 778 HV, with a significant improvement of 1.8% compared with that of titanium alloys. In addition, the fracture toughness of titanium cermets was 21.5 × 1.^6 Pa.m^1.2, much higher than that of other ceramics. Furthermore, the analysis of the loading-unloading curve in the nanoindentation test also indicates that the plasticity of titanium cermet reached 32.1., a relatively high value which illustrates the combination of the metal and ceramics properties. The results suggest that sequential carburization should be an efficient way to produce titanium cermets with hard surface, high toughness and plasticity.

关键词： titanium alloys hardness surfaces ceramics sequential carburization

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