Research On Constitutive Model And Experiment Of Asphalt Concrete

In this dissertation, asphalt concrete is taken as research object and its constitutive theoretical model and the stress-strain relations under high strain rate is studied, besides the influence of confining pressure, temperature, grading factor on the intensity is studiedas well.1. The MAT-147 constitutive model in LS-DYNA970 software is analyzed by theoretical,and the feasibility of using the model on asphalt concrete is studied.2. Some important parameters, which are used to simulating the model, are proposed by Triaxial experiment and SHPB sleeve confining pressure experiment. In addition,The theoretical method of computing and fitting the parameters is provided.3. The SHPB sleeve confining pressure experiment on the AC-16, AM-10 AM-20 asphalt concrete is done under two temperature and three strain rate. A convenient and effective heating, cooling method and the technology of multi-layer plastic sheets against the surface of the incident was applied.4. The comparing experiment shows that: the mechanical properties of asphalt concrete is sensitive to temperature, the higher the temperature, the smaller the intensity; it also has something to do with loading rate, the greater the strain rate, the more significantly increased of the intensity demonstrated by the material; the strength of AC model is obvious higher than AM model.The theoretical research asphalt Concrete constitutive model and the influencing factor of mechanical properties under high strain rate provide a theoretical basis and a experimental basis for the further study on the constitutive relationship.