Asphalt Surface Temperature Cracks Analysis With Extended Finite Element Method

For years, the asphalt pavement surface has been the main form of high-grade highway pavement, its construction of convenience, driving comfort, and easy to repair and maintenance advantages unmatched by other forms of road pavement. However, with the continuous expansion of China’s total mileage, road surface disease caused due to various reasons has received increasing attention in the asphalt pavement cracks, it is commonly found in various stages of the life of asphalt pavement. Because of complex and diverse as the causes of cracks, the China and other countries focused on it and do more research. With the application of the finite element method, in particular, the popularity of large-scale finite element software, cracks in asphalt pavement has been unprecedented development. Its computing power, simulation of cracks in the environment can be done closer to the actual environment of the asphalt cracks, the cracks in a more accurate simulation.In recent years, extended finite element application is to make cracks in the field of simulation analysis is more intuitive, until now, the extended finite element method is the most promising approaches in the field of crack propagation. Based on the concept of the extended finite element, the crack is completely independent of the grid, and the cracks began to crack in the finite element internal. Therefore, the finite element mesh of the shape and direction of the craok propagation process is (?)o need to consider crack automatic extension simulation. At present, the extended finite element method has been in the process of solving many problems To Be successful application.This study will based on the extended finite element method and load the temperature field in the Asphalt Pavement. Visual simulation analysis carried out on the asphalt road surface crack in the expansion of the temperature field. The major research findings and conclusions are as follows:Based on temperature field theory and linear elastic fracture mechanics, as well as the asphalt pavement surface crack propagation under temperature field theory and expansion of basic knowledge of finite element, the temperature field in the extended finite element crack extended model. Asphalt pavement surface cracks in the temperature field under the action of the expansion process. According to the different temperature changes, stress and strain of the asphalt pavement will be different, the mechanical model of the expansion process of the asphalt pavement surface cracks in the temperature field and take advantage of the expansion process was simulated based on an extension of ABAQUS finite element software, and observe the changes with the increase of reaction time, the crack length and width.According to visual observations of the simulation under different temperature field, the crack length and width of cracks over time, come to cracks in the variation of the temperature field under.This study showed that the theoretical derivation and XFEL in the expansion of the asphalt pavement surface cracks in the temperature field is feasible to analyze. Analog expansion cracks in the asphalt surface can be directly observed temperature changes on the crack propagation process in the extended finite element. It can improve pavement design methods, and try for the further application of the extended finite element.