Fundamental study of friction generation on the basis of visualization of contact area between tire and road

采用光诱导荧光法观察了轮胎（橡胶）与玻璃板在湿条件下的实际接触面积。旨在建立从根本上分析摩擦产生与实际接触面积关系的实验技术。提出了利用高斯分布拟合可视化图像的强度直方图提取真实接触面积的方法。并将赫兹接触的理论结果与实验结果进行了比较，验证了其有效性。研制了往复滑动摩擦和滚动滑动摩擦测试仪。验证了摩擦力的测量精度适用于冰面摩擦力的测量，并且可以同时测量摩擦力和实际接触面积。

The real area of contact between a tire (rubber) and a glass plate under wet condition with thin water film was visualized using light induced fluorescence method. It was aimed to establish experimental technique analyzing the relation between friction generation and the real area of contact in fundamental manner. The real contact area extraction technique by the Gaussian distribution fitting to the intensity histogram obtained from the visualized image was developed. And its validity was confirmed by the comparison between the theoretical result of Hertzian contact and the experimental result. A tester to measure reciprocating sliding friction and rolling-sliding friction was developed. It was confirmed that the frictional force measurement accuracy was suitable for measuring friction on ice and also that the frictional force and the real contact area could be measured at the same time.