面向绿色设计的超高分子量塑料传动元件的承载能力研究

Ultra-high molecular weight polyethylene(UHMW-PE) is a special product in technical plastics which possesses a number of outstanding properties，including high toughness, high wear resistance, very good resistance to chemicals. It is poisonless, no pollution and contamination, recyclable, and size-stable as it resists to moisture and water absorption. Moreover, it also owns a low coefficient of friction and stick-resist. The UHMW-PE is a friendly "green" material both to human body and environment. It is widely used in machine components, food and medical equipments. The very high molecular weight gives rise to pronounced visco-elastic behavior. Concerning to the calculation of load-carrying capacity of UHMW-PE transmission components, the traditional method based on the linear mechanics is no more fitted to the high visco-elastic materials like UHMW-PE. This project aims at to solve this problem in the light of non-linear high visco-elastic body principle, a new design method has been formulated and analyzed by using the non-linear FEM and ABAQUS software, and taking UHMW-PE gear and prosthetic hip joint (acetabulum) as models for theoretical analysis. The results have been verified by experiments, the analysis prediction is in agreement with the experiment data. A new and pragmatic compression molding process has been developed in this project for making the transmission components by using the Chinese-made powdered UHMW-PE raw material. Its products have successfully been used in the mining industry.

超高分子聚乙烯塑料性能优异，无毒无污染能回收利用，是制造食品机械和医疗设备传动元件的先进材料。该材料属高粘弹性体，以线性力学为基础的计算方法不再适用。课题在自行开发成型工艺的基础上运用粘弹性力学非线性FEM摩擦学齿轮力学等知识，通过理论分析及匝檠芯浚⒁惶赘美啻某性啬芰扑惴椒吧杓平缦拗担躺杓铺峁┛煽恳谰荨