Constitutive model for asphalt

摘要

Rta (NSW) research simulates results of a constitutive model to describe the elasto-viscoplastic behaviour of asphalt under static and cyclic loading. Simulated elasto-viscoplasticity may be defined by decoupling the elastic and viscoplastic strain elements and observing them separately. Viscoplastic behaviour is accounted for using bounding surface theory, with three stress state zones. The time variant is accounted for using the consistent viscoplastic model, a rate dependant yield function. This model fully encompasses the elastic-viscoplastic behaviour of asphaltic materials subject to time dependant loading, temperature variations and rates of deformation. Numerical modelling used the finite element method, and validation was carried out on experimental data from published literature. Comparisons are made between the simulated results and the experimental results, highlighting the accuracy of the model.