聚醚醚酮基复合材料的热性质和物理性质预测及其摩擦销三维温度场的数值模拟

通过研究填料含量对聚醚醚酮(PEEK)基复合材料密度、比热和导热系数等热学和物性参数影响的规律,提出了三相PEEK基复合材料热学和物理性质的计算模型;以销/盘摩擦副作为研究对象,采用有限元分析法计算模拟了复合材料摩擦销的温度分布,给出了销的三维稳态和瞬态温度场,并讨论了填料含量对摩擦销端面温升的影响规律.结果表明,计算结果与试验结果吻合较好.

Prediction of Thermal and Physical Properties of Filled Polyetheretherketone Composites and Simulation of 3-D Temperature Field of the Pins Made from Them

The models for predicting the thermal and physical properties of the polyetheretherketone (PEEK) composites filled with polytetrafluroethylene and nanometer Al_2O_3 were established by accounting for the effects of the type, content, and construction of the fillers. The effect of the fillers on the rubbing surface temperature rise and friction and wear behavior of the machinery moving parts made of the PEEK composites was also considered. Thus a series friction and wear tests were performed by sliding the nano-Al_2O_3/PTFE/PEEK composite pins against a steel disc so as to get the 3-D temperature distributions of the pins under steady and unsteady states making use of a three-dimensional finite element method (FEM). The effect of the filler content of nano-Al_2O_3 with high thermal conductivity on the thermal properties of the PEEK composites was discussed. The results showed that the numerical simulation solutions based on the FEM were in good agreement with the experimental results. It was feasible to improve the thermal properties of the filled PEEK composites by incorporation of nano-Al_2O_3 at a high content. However, it was imperative to select proper content of the nano-Al_2O_3 so as to acquire excellent comprehensive properties of the PEEK composites.