Study On De-icing Mechanism And Efficiency Using Vibration Method

In winter, many roads are covered with ice, which affects traffic safety and pedestrian safety. This caused enormous damages to our country. This is an urgent issue. In this paper, ordinary asphalt and rubber asphalt pavement are studied. Aiming at de‐icing mechanism and how to improve the efficiency of de‐icing, the paper using fracture mechanics criteria to estimate whether the ice is broken and to find the best de‐icing parameters.First, the mechanical characteristics of the ice test are studied. The paper analyses the deformation characteristics of ice at different strain rates. The proper vibrational frequency is obtained by vibration test data. According to the Kelvin foundation, the paper set up a double plate model on the elastic half‐space foundation model and studied its dynamic response at different excitation. And in order to verify the correctness of the model, a finite element model is established, and discussed the impact of several parameters on the dynamic response. The paper used the finite element model to analyze the mechanical characteristics of the ice and selected the fracture mechanics to explain the destruction of the ice. Using the strain energy density factor theory to introduce a discriminant function to distinguish whether the ice is broken or not. The value of the discriminant function increases with the increase of stress intensity factor. The paper found that with the combination of the mechanical properties of the two materials, the greater the difference, the more fragile the binding surface will be. Three‐dimensional finite element model was built in ANSYS, the paper found the optimal vibration excitation parameters of deicing by comparing the simulation of multiple sets of conditions. Analysis found that it’s easier to de‐ice for rubber asphalt pavement than ordinary asphalt pavement. Shear stress increases along with the frequency and it will make it more efficient to de‐icing pavements. With the increasing of frequency, the deformation of the structure has significantly improved. For the perspective of protecting the road, the excitation frequency can’t be too high. In the end, the paper explored the mechanism of ice damage and how to choose the efficient de‐icing vibration parameters.