Simulation and analysis of two-point bending fatigue test of asphalt concrete based on discrete element model

Qingqing Cao, Xiuyu Liu, Hao Wang, Xiaoming Huang

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Abstract

In order to investigate the fatigue performance of French high modulus asphalt concrete and the correlation between Burger's parameters and fatigue life, the virtual model of asphalt mixture trapezoidal specimen in the two-point bending fatigue test was constructed in discrement element software PFC3D. The initial stiffness and the maximum stress when the specimen reached fatigue were calculated. Through the comparison between virtual and single field fatigue test curves, the credibility of simulation in DEM was verified. Then, the impacts of top controlled displacement and Burger's parameters (E1, E2, η1, η2) on the fatigue life of the specimen were explored. The simulation results indicate that the maximum stress increases with the increase in the top controlled displacement. With the increase of E1 and the decrease of E2 in Burger's model, the modulus of the asphalt binder increases, and the fatigue performance of the asphalt mixture enhances. η1 and η2 have limited influence on fatigue life compared with E1 and E2.

Original languageEnglish (US)
Pages (from-to)286-292
Number of pages7
JournalJournal of Southeast University (English Edition)
Volume33
Issue number3
DOIs
StatePublished - Sep 1 2017

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All Science Journal Classification (ASJC) codes

  • Engineering(all)

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