• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
  • Scopus
  • Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
  • Chinese S&T Journal Citation Reports
  • Chinese Science Citation Database
Volume 56 Issue 4
Jul.  2021
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Article Contents
DU Jianhuan, REN Dongya, HUANG Yangquan, AI Changfa, QIU Yanjun. Simulation of Ⅰ - Ⅱ Mixed Mode Cracking Behavior of Ultra-Dense Asphalt Concrete[J]. Journal of Southwest Jiaotong University, 2021, 56(4): 864-871. doi: 10.3969/j.issn.0258-2724.20190988
Citation: DU Jianhuan, REN Dongya, HUANG Yangquan, AI Changfa, QIU Yanjun. Simulation of - Mixed Mode Cracking Behavior of Ultra-Dense Asphalt Concrete[J]. Journal of Southwest Jiaotong University, 2021, 56(4): 864-871. doi: 10.3969/j.issn.0258-2724.20190988

Simulation of - Mixed Mode Cracking Behavior of Ultra-Dense Asphalt Concrete

doi: 10.3969/j.issn.0258-2724.20190988
  • Received Date: 14 Oct 2019
  • Rev Recd Date: 25 Dec 2019
  • Available Online: 25 Jan 2021
  • Publish Date: 15 Aug 2021
  • This work aims to study the propagation behavior of Ⅰ - Ⅱ mixed mode micro-cracks in the ultra-dense asphalt concrete in cold regions. Based on the Eshelby equivalent inclusion theory and the maximum circumferential stress fracture criterion, the relationship between the declination angle β and the stress field is established for the composite cracks propagating in unstable mode, and whereby the crack propagation direction is determined. Then, a two-dimensional mesoscopic discrete element model of asphalt concrete is built; taking the viscoelasticity of asphalt concrete into consideration, the model is used to simulate the mixed mode micromechanical fracture behavior of the ultra-dense asphalt concrete. The influence of declination angle β on the unstable crack growth is analyzed. Results are obtained as follows: For the two-dimensional plane problems, the change of declination angle β mainly causes the change of crack distribution in asphalt concrete, greatly reducing the effective modulus and shear modulus of asphalt concrete in the time domain. Under the action of constant load, the increase of declination angle β shortens the process of crack initiation and propagation in the ultra-dense asphalt concrete, causing the fracture mode gradually transformed from type Ⅰ cracking into type Ⅱ cracking. Meanwhile, the increase of declination angle β not only causes a certain deflection of the stress field near the crack tip, but also leads to a decrease of the stress field and failure zone in the crack tip region.

     

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