基于半圆试件的沥青混合料疲劳裂纹扩展分析

为获得沥青混合料Paris模型参数，采用半圆形试件进行3个频率的疲劳断裂试验。基于图像技术得到N-a曲线，提出采用二阶指数增长函数拟合疲劳断裂过程。试验结果表明指数增长函数具有更好的拟合效果；Paris模型参数A随着频率的增加而减小，参数n随着频率的增加而增大。

Analysis Asphalt Mixture Fatigue Crack Propagation Base d on Semi-Circular Specimen

The fatigue crack test was carried out based on semi-circular specimen under three frequencies in order to get Paris modular parameter of asphalt mixture. The N-a curve was obtained based on picture image technology, and second index growth function fit fatigue crack process was put forward. The test result shows that the second index growth function has the better fit effect, and parameter A of Paris modular decreases when frequency increasing, and parameter n of Paris modular increases when frequency increasing.