填充聚四氟乙烯(PTFE)的拉伸损伤

Research on the Tensite Damage of Reinforced PTFE

采用声发射技术监测填充聚四氟乙烯的拉伸损伤过程,结合扫描电镜进行断口分析。结果表明:填充剂的成分配比对拉伸性能有明显影响,其本质是拉伸损伤的规律不同。玻璃纤维与基体界面分离形成的微孔对损伤影响不大;青铜粉与基体界面分离形成的微孔则易于诱发裂纹,并促进裂纹扩展;聚苯乙烯在弹性变形阶段就可能断裂,导致材料脆化。不同的拉仲损伤产生的声发射信号规律不同。因此,可利用声发射技术对复合材料的损伤作更深入的研究。

This paper dealt with tensile damage of the reinforced PTFE through detecting by acoustic emission technique and fracture analysis with scanning electron microscope. It was shown that the reinforcing component materials for the PTFE matrix had an obvious effect on their tensile properties. The microporosities formed by detaching interface between glass fibres and the matrix had little or no effect on the damage, while that formed by detaching interface between bronze powders and the matrix could initiate and develop microcracks. The embrittlement of the reinforced PTFE would be resulted from cracking of polystyrene itself as one of the reinforcing component materials, during elastic deformation. The variations of acoustic emission signals were corresponding relatively to the different damage forms in tensile processes. So a further study on the damage of the reinforced PTFE can be done by means of acoustic emission technique.