Evaluation of Fatigue Life of Asphalt Pavement Under the Effect of Load Speed and Tire Inflation Pressure by Numerical Method

Document Type : Original Article

Authors

1 Department of Civil Engineering, Semnan University, Semnan, Iran

2 Professor, Department of Civil Engineering, Semnan University, Semnan, Iran.

3 Department of Civil Engineering, University of Isfahan, Isfahan, Iran

10.22091/cer.2024.10885.1560

Abstract

fatigue failure is a set of interconnected cracks in the asphalt concrete surface that occurs under repeated traffic loading. Various factors cause this type of cracks, including high repetition of tensile stresses and strains in the lower layers of the asphalt surface, low thickness of the surface or improper connection of its layers, excessive deformation of the pavement layers due to loading, low strength of the subgrade and the speed of passing vehicles. In this research, the tire speed parameter of the vehicle has been investigated in order to evaluate the fatigue life and calculate the parameter of the number of repetitions allowed to pass. Therefore, ABAQUS software was used and only the forces acting on the surface of the asphalt were used to simulate the tire. Also, in order to investigate and analyze the fatigue, the horizontal strain of the asphalt substrate was investigated. In the following, a crack with the required specifications was modeled in the software and the stress intensity coefficient parameters were calculated for it. The results showed that with increasing speed, the values of stress, strain and displacement decrease. The effect of speed on the longitudinal tensile strain at the end of the asphalt layer is more significant at low speeds and the slope of the strain changes graph decreases with increasing speed in such a way that by increasing the speed from 32 kilometers per hour to 56, approximately 37% and up to 80 kilometers per hour, approximately 42% reduction in strain is observed.

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Articles in Press, Accepted Manuscript
Available Online from 25 November 2024

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