A CONTINUUM DAMAGE APPROACH OF ASPHALT CONCRETE FATIGUE TESTS

Abstract eng:
To forecast pavement fatigue cracking, fatigue performances of asphalt mixtures are assessed using laboratory cyclic fatigue tests. A damage model is implemented to predict the behavior of asphalt mixtures during these tests. Under sinusoidal loading, the evolution of the complex modulus of the material is defined as the damage variable associated to a microcracking mechanism. Its evolution during fatigue tests is described by an elasticity based, nonlocal damage model. A cycle based time treatment is implemented into a finite element code, to simulate high cycle fatigue tests. The damage model parameters identification is performed using uniaxial fatigue tests. With these parameters, bending fatigue tests simulation results are discussed. The comparison between simulated results and experimental data points out a good approximation of the fracture process before damage localization in the specimen.

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