Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (12): 3955-3963.doi: 10.13229/j.cnki.jdxbgxb.20240325

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Simulation analysis on SCB test of asphalt concrete using cohesive zone model

Zheng-feng ZHOU1,2(),Hu-cheng TANG1,2,Xin-wang OU1,2   

  1. 1.School of Civil Engineering，Southwest Jiaotong University，Chengdu 610031，China
    2.Highway Engineering Key Laboratory of Sichuan Province，Southwest Jiaotong University，Chengdu 610031，China
  • Received:2024-03-28 Online:2025-12-01 Published:2026-02-03

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Abstract:

To explore the cracking characteristics of asphalt concrete， a finite element software ABAQUS was employed to simulate the semi-circular bend （SCB） test of asphalt concrete using a bilinear cohesive zone model （CZM）. The simulated load-load line displacement curve was compared with the experimental result to validate the applicability of the CZM in cracking analysis. Based on this， the internal stress distribution， system energy balance， fracture behavior parameters during the cracking process of the SCB specimen， and the effects of cohesive zone model parameters on the load-load line displacement of the specimen were analyzed. The results indicate that the bilinear CZM has good applicability in cracking analysis of asphalt concrete. During the loading process， the SCB specimen undergoes elastic， damage， and fracture stages. The point of instability of crack propagation does not correspond to the peak load， leading to an overestimation of fracture toughness when calculated using the peak load； a portion of the fracture work converts into elastic strain energy in the uncracked region of the specimen， resulting in an overestimation of fracture energy when calculated using fracture work. The peak load that the SCB specimen can withstand during the cracking process mainly depends on the tensile strength of asphalt concrete rather than fracture energy.

Key words: road engineering, asphalt concrete, semi-circular bend test, cohesive zone model, fracture, numerical simulation

CLC Number: 

  • U416.217

Fig.1

SCB test specimen configuration （millimeters）"

Fig.2

Stress-separation response constitute of CZM"

Fig.3

Comparison of load-load line displacement curves"

Fig.4

Stress distribution of cross section at mid-span of SCB specimen under different loading stages"

Fig.5

Status of cohesive elements at mid-span of SCB specimen under different loading stages"

Fig.6

Load-load line displacement curve and status of cohesive elements of SCB specimen"

Fig.7

Energy balance during SCB test"

Fig.8

Load-load line displacement curves varied with fracture energy of cohesive elements"

Fig.9

Load-load line displacement curves varied with damage initiation stresses of cohesive elements"

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