Abstract:
In order to study the fatigue crack propagation characteristics of asphalt
mixture, a model of fatigue crack dynamically propagating was established based
on the Paris law modified with fracture energy release rate. Four different types of
asphalt mixture were tested using semi-circular bending fatigue test (SCB fatigue
test) to obtain the corresponding N-a curves. The extended finite element method
(XFEM)was adopted to simulate the SCB fatigue tests for 4 types of asphaltmixture.
The results show that the N-a curve obtained from the finite element model is highly
consistent with the experimental results, which verifies the feasibility of fatigue
crack propagation analysis based on modified Paris Law characterized by fracture
energy release rate for asphaltmixtures. The extended finite element methodwas used
to establish the fatigue crack dynamic propagation model of the asphalt mixtures.
The fatigue crack propagation process of the specimen was simulated to verify the
effectiveness of the method.
