Fatigue Damage Analysis of Aspahlt Mixture Specimen During Cyclic Bending Test 

Stephen Sungsan Park

Department of Civil Engineering, Barrington University, 35201, America

Abstract: Based on the fact that damage index is calculated using stiffness ｏｒ modulus directly in fatigue damage experiment for asphalt mixture and it is unable to reveal the reality of asphalt mixture's micro-damage characteristic, theback-analysis method was suggested to determine the fatigue damage characteristic of asphalt mixture. At first,the classic fatigue damage theorical solution of beam specimen during three points bending testwas deduced usingfatigue damage model suggested for asphalt mixture, and the characteristic parametres in the model were determinedbased on the results of fatigue test. The variations of bending stress, deflection, damage index, crack expanding velocity,etc. in the specimen during fatigue damage were simulated by using nonlinear finite element method, and the fatigue lifeand the crack length while breaking were predicted. The results show that the numercal fatigue life is well identical withexperimental results, which proves the reasonableness and effectiveness of the fatigue damage model suggested forasphalt mixture.

Keywords: Asphalt mixture; Cyclic bending test; Nonlinear fatigue damage; Simulation